HomeMy WebLinkAboutOrdinance - 2122-1957 - Amending The Lubbock City Code By Adding Chapter 38 - 01/10/1957~~»,aA~t..
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ORDINANCE NO. 2122
0\ -.:14-'q 57
ORDINANCE AMENDING 11 THE LUBBOCK CITY CODE11 , BY ADDING
CHAPT 8, ENT:l'l D 11WARM AIR HEATING CODE''; GOVERNING THE
C:ONST:l. ~ION ArtB ~TALLATION OF WARM AIR HEATING AND VENTI-
LATINtl D HEATJNG..APPLIANCES AND SYSTEMS IN THE CITY OF LUBBOC
PR.O,VmiNO THAT PROVISIONS HEREOF ARE CUMULATIVE WITH OTHER
ORDn.tANCES OF THE CITY OF LUBBOCK; DEFINING THE SCOPE AND APPLI-
CATION O~J SAID GOVERNING REGULATIONS; PROVIDING FOR CERTAIN
MINIMUM .llLECTRIOAL AND STRUCTURAL STANDARDS AND REQUIREMENTS
TO BE MET IN THE CONSTRUCTION AND INSTALLATION OF WARM AIR
HEATING AND VENTILATING AND HEATING APPLIANCES AND SYSTEMS;
PROVIDING BOR BOND TO BE POSTED BY ANY CONTRACTOR OR OTHER
PERSON, FIRM, OR CORPORATION OTHER THAN THE OWNER OF SUCH
WARM AIR HEATING AND VENTILATING AND HEATING APPLIANCE AND
SYSTEM IN THE AMOUNT OF ONE THOUSAND DOLlARS; PROVIDING FOR TH
FURNISHING OF CERTAU'f INFORMATION TO THE BUILDING INSPECTOR AND
THE INSPECTION FEES TO BE COLLECTED BY THE BUILDING INSPECTOR;
PROVIDING A PENALTY AND SAVINGS CLAUSE LIMITING LIABILITY; AND
AUTHORIZING PUBLICATION OF THE DESCRIPTIVE CAPTION AND PENALTY
ClAUSE BY THE CITY SECRETARY.
Jh.ll· at& WHEREAS, The City Commission finds that it is necessary that certain
t1 -~.....--.. minimum standards, provisions and requirements be made for safe and stable
I'J(ttd.-design. methods of construction and installation and uses of material~ designed ~· and to be used for Warm Air Heating and Ventilating and Heating Systems in ~~£. 0,;; buildings and structures hereafter erected, constructed, enlarged, altered_repaire
/} £., or moved into the City of Lubbock, in order to assure and preserve th~ health ?:j~~ and general welfare of the people of the City of Lubbock; NOW • THEREFORE,
\. BE IT ORDAINED BY THE CITY COMMISSION OF THE CITY OF LUBBOCKc
SECTION f-THAT the "Lubbock City Code·' as established by Ordinance
No. 1803 and Ordinance No. 1837 BE and the same is hereby amended by adding
thereto Chapter 38, entitled 11WariD Air Heating Code11, which will read as follows·:
CHAPTER 38
WARM AIR HEATING CODE
ARTICLE I.
TITLE, APPLICATION, AND SCOPE
38-1 a. TITLE: This Ordinance shall be known as the ttWarm Air Heating Code. 11
38-1 b.SCOPE AND APPLICATION:
(1) The provision~ of this Code shall be deemed cumulative with and supplemental
to any and all City Ordinances related by subject matter.
(2) The requirements of this Code shall apply to the installation or construction o
new buildings and structures hereafter erected, constructed, enlarged, altered.
repaired, or moved into the City of Lubbocki and the addition, alteration and chang
o any existing Warm Air Heating and Ventilating and Heating Systems now attached
o any existing building and__structure or to be hereafter attached to an existing
uilding and structure to which any such requirements as herein provided are
pplicable.
(3) The reference herein to any standard or Code as promulgated by any associa-
ion shall be and apply to that standard or Code as particularly herein descri~d an
is hereby made a part hereof as though copied herein. A copy of such standard or
Code as promulgated by any such association is herein incorporated and shall rem-
in on file in the offices of the City Secretary and the Building Inspector at the City
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Hall in th. City of Lubbock, Texas, as part of the official records of the City of
Lubbock. (4) The following specified requirements shall apply to construction and installa ~
tion and ~ses of materials designed and to be used for Warm Air Heating and
Ventilating and Heating Systems, and it shall be unlawful for any person, firJl), or
corporation to install, construct, enlarge, alter and change any Warm Air Heat-
ing and Ventilating and Heating System contrary to or in violation of any provisio
of this Code or to cause,. permit or s{lf£er the same to be done.
ARTICLE II.
ELECTRICAL REQUIREMENTS
3 8-Z. 1 Central Heatins
All central heating equipment shall be on a separate circuit with a means of
disconnecting said equipment to be installed in the equipment room. Overload
protection shall conform with the National Electric Code 1956, N. B. F. U. No. 70,
and shall be closely coordinated with the motor rating.
38-Z. Z All electric wiring or cable shall clear all duct or ducts by a minimum. of
three (3) inches.
ARTICLE Ill.
PLUMBING REQUIREMENTS
38-3. 1 Gas Fired E9uipment
'
All gas fired equipment must have the approval of the American Gas Associatior
and such approval may be evidenced by the stamp of such Association being attache
or imprinted thereon.
38-3.2 Air for Combustion
3. 2. I Appliances shall be installed in a location in which the facilities for venti -
ation permit satisfactory combustion of gas and proper venting, under normal
conditions of use. This requirement may usually be met by application of one of
the following methods in ordinary building construction:
3. z. 1 (a) In buildings of conventional frame, brick or stone construction without
enclosed appliance rooms, basement storm windows, or tight stair
door~ infiltration is normally adequate to provide air for combustion
and draft hood dilution.
3. 2. l (l,))Where appliances are installed in a confined space within a building,.
provision may be made for supplying this space with air for combustior
and ventilation by eliminating the ceiling of the confined space; provide ,
however, that the area above this confined space freely communicates
with the outdoors.
3. 2.1 (c) Where appliances are installed in a confined spac~ within a building
. having adequate a.ir infiltration, provisions shall be made for supplying
this space with air for combustion and ventilation. This may be
accomplished through use of two permanent openings freely communi-
cating with interior ateas of adequate infiltration or by c~mpliance
with provisions of item 3. 2, 1 (b) or (d). These two permanent opening~
shall each have an area of not less than 1 sq. in. free area per 1000
Btu ~er hour of input rating. One opening shall be near the top of the
confined ~pace and one near the bottom. If necessary, continuous
ducts having cross-sectional areas equal to the opening shall be utilized
to communicate with the source of air supply. The minimum dimen-
sions of rectangular air ducts shall be not less than 3 inches.
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3.a.l {d)
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Where appliances are installed ltRd'sfiinij.ned space within a
building, the building being offtight c-onS'truction. air for
combustion and ventilation must be obtained directly from
outdoors or from spaces (crawl or attic~ freely comm.uni•
cating with the outdoors. Under these conditions, the openings
called for in 3. z. 1 (c) shall be replaced either by the provision
3. z. 1 (b) above or by two openings having a .com'9ined area of
not les.s than one square inch per free area 1000 Btu per hour
of input rating. One opening shall be near the top of the
enclosure and one near the bottom. These openings shall be
of approximately equal area and shall communicate with the
selected source or sources of adequate air supply by continuo
ducts of the same cross-sectional area as the Qpenings to whic
they connect. The minimum dimension of rectangular air
ducts shall be not less than 3 inches. Any duct fr9m the top
opening must be horizontal or pitched upward.
3. z. 1 {e) Where appliances are installed in unconfined spaces; such as a
full basement, within a building of unusually tight construction,
air for combustion and ventilation m'.lst be obtained from out-
doc;»rs or from spaces freely communicating with the outdoors.
Under these conditions, a permanent opening or openings hav ...
ing a total free area of not less than 1 sq. in. per 1000 Btu per
hour of input. rating shall be provided. Where ducts are re-
quired, they shall be of the sam•! cross-sectional area as the
openings to which they connect. The minimum. dimension of
rectangular air ducts shall be not less than 3 inches.
3.l. 1 {f) The size of combustion air openings specified above shall not
necessarily govern in installations having a combination input
in excess of 400, 000 Btu/hr.
3. z.l (g) Operation of exhaust fans, kitchen ventilation systems or
fireplaces may create conditions requiring special attention
to avoid un~atisfactory appliance operation.
, ~38'.-3_. 3 . Installation
3. 3. 1 Every appliance shall be installed so that any part of equipment
requi:ring servicing will be rea~ily accessable for replacement and servicing.
3. 3~ 2 Installation and minimum. clearances shall be as set forth in manu
facturerTs r~commendation• and/or as specified in the American Gas
Associations' approval requirements.
3. 3. 3 Gas room heaters installed in ~leeping quarters for use of transits
as in hotels, mdel.s and auto courts shall be approved by the American Gas
Association for vented u,_.e, and the approval may be evidenced by the stamp
of such association being attached or imprinted the.reon. Such heaters shall
be connected to an effective flue or vent •
. ~~-3. 4 Return 1\.ir Connections
Return air connections in the furnace room or directly below the furnace
room shall be so made as to preclude any possibility of air being drawn from
the furnace room into the return air duct by action of the furnace fan.
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ARTICLE IV.
STRUCTURAL REQUIREMENTS
38-4.1 Duct Systems for Residence Type Warm Air Heating Systems
4. 1. 1 Supply ducts -construction
4. 1. 1 (a) Duct material. Except as permitted by paragraphs 4. 1. 1 (a) (3)
and (4), supply ducts shall be constructed entirely of noncombustibl
materials equivalent in durability to the following~
4. 1. 1 {a) (1) Ducts Not Enclosed in Partitions:
Round Ducts
Minimum
Thickness
Diameter, Ga:W. Iron
Inches u. S . Gauge
Less than 12. • • • • •• . • • • • • • • 30
12 or more • • • • • • . • • • • • • • • • 28
Rectangular Ducts
Width Inches
Less than 14 ••••••••
14 or more •••••••• • •
• •
• • • • •
• • • • •
Minimum
Thickness
Galv.Iron
U.S. Gauge
Z8
26
4. 1. 1 (a) (2.) Ducts Enclosed in Partitions:
Width
Inches
14 or less
Over 14
Rectangular Ducts
Minimum
Thickness
Galv. Iron
U.S. Gauge
• • • • • • • • • • • • • • • 30
• • • • • • • • • • • • • • • 28
Minimum
Thickness
Aluminum
BItS Gauge
26
26
Minimum
Thickness
Aluminum
B ~ S Gauge
26
Z4
Minimum
Thickness
Alwninum
B &t S Gauge
Z6
.26
Minimum
v-Weight
of Tin Plate
IC(107 lb.~
IX(135 lb.
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Minimum
Weight
of
Tin Plate
IC {107 lb.)
IX(135 lb.)
4. 1. 1 (a) {3)Supply ducts that are completely encased in not less than 2 inches
of concrete in a floor slab need not be constructed of noncombustible
material •
• 1. 1 (a) {4) Vibration isolation connectors in duct systems shall be made of woven
asbe.stos or approved flameproofed fabric or shall consist of ,;leeve
joints with packing of rope asbestos or other approved nc;mcombustible
material. Vibration isolation connectors of flameproofed fabric shall
not exceed 10 inches in length •
• 1. 1 (b) Duct Joints. Joints and seams of supply ducts shall be securely
fastened and made substantially air tight. All joints of supply ducts shall be
fastened with metal screws or drive cleats. Slip joints shall have a lap of at
least one inch and shall be individually fastened. Tape used for sealing joints
shall be not more combustible'"ttfan approved flameproofed fabric.
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4. 1. 1 {c) Duct hangers. Supply ducts .shall be securely supported by metal
hangers, straps11 lugs or brackets. No nails shall be driven through the
duct walls and no unnecessary holes shall be cut therein.
4. 1. 1 {d) Firestoppin.g. Where the installation of supply ducts in walls,
floors. or partitions requires the removal of any firestopping, the spaces
around the duct at such points where fire~topping was removed shall be
sealed with asbestos, mineral wool, or other non•c:ombustible insulating
lnaterial.
i•1•2 Clearances from horizontal sup;ely ducts
4.1. 2 (a) Where ducts are adjacent~ plaster on metal lath or to other
noncombustible material attached to a combustible material, the clearance
shall be measured to the combustible material. except that the clearance
shall be measured to the surface of the plaster or other noncombustible
finish where a clearance of 1 inch or 2 inches is specified above SU}_J~ly ducts
within the distance from the plenum specified in paragraphs 4.1. 2 ~b), \1)
and (2). This shall not be-cons·trued to prohibit clo:;ure of openings with non ..
combustible material where-ducts ~ass through wallt$ and partitions,as
provided in paragraph 4. 1. 2 (~) (6).
4. 1. 2 (b) Minimum clearances from horizontal supply ducts shall be as
follows;
{l) Within a distance of 3 fe~t of the plenum of a system
classified under Items ll and III of Table A, the clearance shall
be not less than specified ab9ve the bonnet or plenum.
(2) Within a distance of 6 feet of the plenum of a system
classified under Items I, IV and VI of Table A, the clearance
shall be n9t lesM than specified above the bonnet or plenum.
(3} Beyond the distance fr9rn the plenum specified in para-
graphs 4.1. 2 (b) (1) and (2). no clearance is required except as
provided in paragraphs 4. 1,. 2 {b) (4) and (5).
(4} From ducts of furnaces classified under Item IV of
Table A, the clearance shall be not less than 6 inches out to 6
feet and one inch beyond 6 feet to a point where there is a change
in direction equivalent to 90 degrees or more.
(5) From ducts of furnaces that require 18-inch clearance
above the bonnet or plenum (see Table A), the clearance shall be
not less than 18 inches out to 3 feet, not less than 6 inches from
3 feet to 6 feet. and not less than one inch beyond 6 feet.
(6) Where a horizontal supply duct passes through or pierces
a partition or enclosure constructed of combustible material, the
clearance shall be not less than specified in paragraphs 4. 1. 2 (b)
(1), (2), (4) and (5}. The ends of the space providing this clearance
may be closed with a thimble and collar, or the wall surfaces extended
to the duct with noncombustible building material such as plaster on
metal lath.
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4.1. 3 Clearances from vertical d1,u;ts, risers, bqots and register boxes I ;
4.1. 3 (a) Where a duct, riser, boot or box on a system that dc;>~s not require
18-inch clearance above the supply plenum or bonnet enters a floor, ~rti ..
tion or enclc;>sure constructed of combustible material within the distance
from the plenum specified in paragraphs 4. 1. 2 {b) {1} and (2), the clea:tance
from such duct, riser or boot shall be not. less than the distance required --·
above the furnace bonnet or plenum (see Table A), or the duct shall change
direction equivalent to at least two l90 degree turns before entering such
floor, partition, or enclosure. •.
4. 1. 3 (b) Where a supply duct enters the floor of the first story above
that in which the furnace is located, the space around the duct at such
points shall be sealed With asbestos cement or other noncombustible material
4. 1. 3 (c) Where a duct, riser, boot or box on a systein that requires 18• inc
clearance above the supply plenum or bonnet ente:rs a floor, partition, or
enclosure constructed of combu!ftible material within a horizontal distance
of 6 fed of the furnace, the duct shall be so arranged that heated ai~ must
travel at least 6 feet from the clbsest primary heating surf&.ce and change
direction equivatent to at. least ·one 90 degree turn before entering such floor,
partition or enclosure.
4. 1. 3 (Cl) Where a duct, riser, boot or box on a system tl':l.at requires 18-inch
clearance above the supply plenum or bonnet e'ders the floor of the first story
above that in which the furnace is situated, the clearance shall be at least
3/16 of an inch from all combustible material in the floor construction, unless
the duct is of double wall construction with a continuous· air Space of not less
than 3/16 of an inch between the inner and outer walls.,
4. 1. 3 (e) Where a duct or ris·er on a systen'l. that requires 18-inch clearance
above the supply plenum or bonnet is enclosed in a partition, wall, or con"'
cealed space constructed of combustible material:
{1}
(2)
Such duct shall be installed with an air space of not less than
3/16 of an inch between the duct and the combustible material,
unless a noncombustible insulating covering of cellular type at
least 1/8 inch thick is provided (in metal lath and plaster
partitions no ~ir space is needed. e!kcept from wood studs).
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Or, such duct shall be made double with a continuous air space
of not less than 3/16 of an inch between the inner and outer walls.
4. 1. 3 (f) Where a register on a system that requires 18-inch clearance above
the supply plenum or bonnet is pl.a.ced in a floor or wall constructed of com-
bustibl~ material, the register box shall be installed with a clear space of not
less than 3/16 inch between the top and sides of the box and any combustible
material.
4 .. 1.4 Heating Panels
Air chambers, having one or more external surfaces designed for use as
heating panels shall comply wfth the following:
4. 1.4 (a) Use. Heating panels shall be used only with:
(1} Automatically fired gas or oil burning forced war.m air systems
equipped with temperature limit contiols that cannot be s.et
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above ~00 F. 1
Or) forced warm air systems equipped with heat exchangers
utilizing steam which .cannot exceed 15 pounds gauge pressure
or hot water which cannot exceed a temperature of Z.SO F.
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4. 1.4 (b) Connection. Heating panels shall be connected to supply ducts
confo-rming to s·ection 4. 1. 1 and ret1,1rn air ducts conforming to secti~m 4. 1.
4. 1. 4 (c) Oqn,t:tuction.
(1) Where warm air supply is from a wann air furnace, heating
panels shall be enclosed on all sides with material which is wholly non-
combustible or which .possesses a flame spread rating of not over ZO as
determined in accordance with the Method for Fire Hazard Classification
Gf Building Materials, ASTM E84, Underwriters Laboratories, Inc.,
Standard. This enclosing material shall be securely attached to the building
structure; Joints and seams shall be substantially air tight. Braces and
hangers inside the chamber shall be noncombustible.
(Z) Where warm a.ir supply is from<'-steam or hot water heat
exchanger, heating panels shall either comply with paragraph 4. 1.4 (c)
(1), or shall be enclosed on all sides with m .aterial not more flammable than
l-inch wood boards •. This enclosing material shall be securely aUached to
the building structure; joints and seals shall be sul;>stantiall:y air tight. No
single vertical heating panel shall serve more than one story.
4. 1. 5 Return ducts.
4. 1. 5 (a} Duct material
(I) Return ducts, except as required by par~graph 4. I. 5 (a) (Z),
may be constructed of metal, ofoue-i.nch (npminal) wood boards, or other
suitable m.:tterial, provided that no material more flammable than one-inch
boards shall be used.
{Z) Portions of ret~J,rn ducts directly above the heating surface,
or closer than 2 feet from the outer jacket or casing of the heater shall be
constructed in accordance with. provisi9ns of paragraph 4. 1.1 for supply
ducts.
(3) The interior of co.mbustible ducts shall be lined with non-
combustible material at points where there ni'-ght be danger from incandesce
.pa.crticles dropped through the regiater or hea~er such as directly under floor
registers and the bottom of vertical ducts or directly UJlder heaters having a
bottom return.
4. I. 5 (b) Firestopping.
(1) Where return ducts are installed in walls, floors or partitions,
their installation shall comply with the pro.vis.ions of paragraph 4.1. 1 (d).
(Z) Where spaces between studs in walls or partitiops are used as
ducts, the portions of such spaces. so used shall be cut off from all remaining
unused portiens by Jight fitting stops. of sheet mdal or of w9od not less than
Z inches (nominal) thick.
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4. 1. 5 (c) Duct openings. No vertical duct shall have openings to receive
return air on more than one floor.
4.1. 5 {d) Continuous ducts.
(I) Return air shall be conducted to the heater through continuous
ducts, except as indicated in paragraphs 4. 1. S (d) (Z) and (3).
(Z) Underfloor spaces may be used as ducts fGr return -of air from
rooms directly above, provided such spaces are not over 2. feet in height
to bottom of floor joists and are cleaned of all combustible material and
are tightly and substantially enclosed.
{3) In a 5ingle story residence, the zeturn air may travel through the
first floor living space to furnace air inlet grilles lt~cated at or above the
first floor level.
4.1. 5 (e) Negative pressure from circulating fan. The return system :3hall
be arranged so that negative pressure from the circulating fan cannpt effect
the air supply fQr combustion or act to draw products of combustion from
joints or openings in the furnace or flue. 1
~m-4. 2 Warm Air Heating and Ventilating Systems, of other than
Residence Type
;
4. 2. 1 Application
This section applies to air duct sy$tems ernploying mechanical meanEiS'
for the movement of air and used for heating and ventilating, combination
heating and ventilating systems, exhaust systems, plain ventilating systems,
and warm air heating sy•tems, except that it does not. apply to residence type
systems. nor to systems for removal of flam..-nable vapors and residues nor
to systems for conveying dust_ stock .or refuse by rneans o! air currents.
4. 2. Z Construction of ducts.
4 • .z. Z (a) Ducts shall be constructed entirely of noncombustible material.
such as iron, steel, aluminum ·or other approved material, except as apecified
in paragraph 4.1.1 (a} {3).
4:. z. Z (b) Ducts shall be s.o constructed as to provide structural strength
and durability at least the equivalent of materials of the thicknesses specified
in the table below, except that spirally wound ducts, under 6 inches in di.a.mete
may be of 30 u. s. gauge steel. Wired glass may be used for inspection
windows in ducts.
Round Ducts
iameter (Inches)
Up to 13
4 to 33 1/2.
4 to 67 1/Z
Thickness of Metal for Air Ducts
Rectangular Ducts
Max. Side (Inches)
Up to lZ
13 to 30
31 to 60
61 to 90
91 and above
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Minimum
Thickness
of Steel
U. S. Gauge
2.6
.Z4
22.
2.0
18
Minimum
Thickness of
Aluminum
B .8t S Gauge
24 .az
2.0
18
16
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4. z.. z. {c) Ducts may be of independent construction or .ma.y be formed by part~
of the building structure, provided that they conform. to the requir~ments of
this section. Construction consisting of not les.s than 3/4-inch cement or
gypsum plaster on m •eta.l lath applied to either combustible or noncombustible
supports may be used a~ duct wall~.
4. 2. 2 (d) Flexible duct connectors for use between ducts and air outlets or
air outlet. units need not conform to the requirements for ducts if they confoJ.aJ
to ~e following provisions and are approved for 'his use:
(1) They shall be made from a., base material of metal or mineral.
{2) They shall not be subject to deterioration from mildew or moisture,
(3) They shall not be m1)re combustible than approved flatneproofed
fabric.
(4) They shall not exceed 12. feet. in length.
(5) They shall not exceed 8 inches in diameter.
(6) They aha.U not pass through any fire wall, required two-hour
partition, or floor.
(7) They shall be covered with not less than one-half inch of non-
combusti.ble insulating material or shall be located in an enclosure
construckd 9f noncombustible material.
4. z. 2. {e) Vibration isolation connector.s in duct systems, other than as
covered by paragraph 4. Z.. 2. {£}, shall be made of woven asbestos or approved
flameproofed fabric or shall consist of sleeve joints with packing of iope
asbesto~ or other approved noncombustible material.. Vibration i.solat~on
connectors of fabric shall not exceed 10 inches in length.
4. 2. 2. (£) A vibra.tion isolation connector at the jQint between duct and fan
where the inlets to the fan, if of exhaust type, or the outlets from the fan
are in the same room or enclosure as the joint shall b~ ~empt from para•
graph 4. 2.. 2 (e) if not over 10 inches in leng~
4. 2. 2. (g) Only approved fire-resistive linings shall be used inside of ducts.
4. Z.. 2. (h) Combustible coverings shall not be used on the outside of ducb
carrying air at a t.emperatu:re above 175 F.
-4 • .2. 2. (i) Work involving the use of torches shall not be undertaken on ducts
until the system has been shut down, the duct cleaned and all combustible
lining and covering material has been re~noved from the portion of the duct
being altered.
4. 2.2 (j) Ducts shall be -made reasonably tight throughout and shall have no
openings other than those-required for the proper operation and maintenance
of the system.
4. 2.. 2 (k) Tape uaed for sealing joints shall be nQt more combustible than
approved flam·~pro.ofed fabric.
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4. z. 3 Clean out openings in ducts.
4.2. 3 {a) Return ducts, other than. vertical, shall be so constructed that the
interior is accessible for clea:ning, except that accesaibility is not required
where all ·of the following conditions prevail:
(1) The occupancy is not productive of combustible material, such as
lint, dust or greasy va~ors. Such occupancies are banks, offices, churches,
hotels and institutions {but not kitchens, service rooms and manufacturing
portions).
{2) The ret11rn openings are at least 7 feet above the floor or are
protected by corrosion-resistant metal screens of at least 14 me.sh
installed back of the grilles so that they will not draw in papers. refuse,
cigarettes and other combustible s.olids.
(3) The minimum. design velocity in the return from the particular
occupancy is 1, 000 feet per m inute.
4.2. 3 (b) Clean-out openings at approximately 20-foot intervals shall be
provided where acces.s.ibility t 0 facilitate cleaning is required and where the
ducts are smaller than 18 x 24-inch. Removable grilles Df adequate size
and accegsibility may be accepted aa. clean-out. openings.
4.2. 3 (c) Supply ducts, other than vertical shall conform to the ab¢ve
regulation for return ducts, unless all of the supply air passes. through either
water spray or filters. ·
4. z. 4 Installation of ducts
4. z. 4 {a) Duets shall not be built into a building in such a way as to impair
the effectiveness of the fireprobfing around steel or iron structural members,
such as placing ducts between the fireproofing and the m ·embers protected,
except in the case of beams or joists protected by a fir'e•resisting ceiling.
4. Z.4 (b) Where the installation of duets in walls, floors or partitions
requires the removal of any firestopping, the spaces around the duct at such
points where firestopping was removed shall betnghtly filled with asbestos,
m~.neral wool or other cnoncombustible material.
4. 2..4 (c) Ducts which pass through floors of fire-resistive construction,
protected noncombustible construction, or heavy timber construction, and
in which ve'l'tica.l openings are protected shall be encased in 4-inch hollow
clay tile, 4-inch gypsttn'l block, or their equivalent except as qualified below: .
(1) The encasing of ducts shall not be required for branches which
are cut off from the main portion o£ the duet by approved fire dampers.
(2} Du.cts which are located in one story and have all duct openings
ex~nding through a floor to the story next above or below may in lieu
of such fire-resistive enclo&ure be provided with approved fire dampers
at each such point where the flopr ia pierced.
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(3) Two or more ducta serving separate floors shall not be encased
in the same !ire .. resistive enclosure unless approved automatic fire
dalllpers are installed where each branch i.s taken from sach enc~sed ducts.
4. 2.4 (d) Public exit halls in institutional pccupanci es and in hotels and
multifamily houses shall not be used as plenums, that ia, as compartments
to which one. or more ducts are connected so as to form part of the air
distribution system.
4. z-.4 (e) Ducts shall be substantially supported. Hangers and brac~G!ts for
supporting ducts shall be of metal.
4.l. 5 Clearances from warm air ducts.
4. 2. 5 (~) Metal warm air ducts shall be installed with clearances to
combustible material as follows:
(I) Within a distance of 3 feet of the plenum of a system classified
under Items ll and ill of Table A~ the clearance shall be not. less than
speclfied above the bonnet or plenum ..
(l) Within a distanc:re of 6 feet of the plenum. of a system classified
under Items I, IV and V1 of Table A, the clearance shall be not less than
specified above the bonnet or plenum.
(3) Beyond the distance from the plenum specified in paragraph 4. 2. 5
(a) and (b), the clearance shall be not lel)s than 1/l inch except as provided
in paragraphs 4.1. 3 (d) and 4.1. 3. (e)•
(4) From duds of furnaces cla.s~ified under Item IV Qf Table A., the
clearance shall be not less than 6 inches out t" 6 feet and one inch beyond
6 feet to a point where there is a change in direction equivalem.t to 90 degrees
or more.
(5). From ducts of furnaces that require 18-inch clearance above the
bonnet or plenum (see Table A); the clearance shall be not less than 18
inches GUt to 3 feet, not less than 6 inches from. 3 feet to 6 feet, and not
less than one inch from 6 feet tG ll feet.
4.z. 5 {b) Where a ~etal warm duct passes through or pierces a partiti~n
o·r encl&sure constru-cted of combustible material, the ends of the space
providing the required clearance tnay be closed with a thimble and collar
or the wall surfaces extended to· the euct with noncombustible building
materials such as plaster on metal lath.
4,.l,. 6 Automatic Fire doors and gaupc~s,
4. 2.6 (a) When ducts or the outlets from or inlets to them pass through fire
walls, they shall be provided with approved automatic fire doors em both
sides ef the wall through which they pass. On small o.penings not exceeding
18 inches in diameter, 3/8-inch steel plates may be used as fire doors.
Suitable band hole opel'lings shall be provided to make all fire doors and fire
dampers in ducts accessible for inspection and servicing.
4. 2.. 6 (b) An approved fire damper shall be provided on each opening
through a required two•hour partition.
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4,. z. 6 (c) In a system having a total fan capacity in excess. of 3, 000 cubic
feet per minute,-each main duc:t which serves more than one floQr shall be
provided with an approved fire damper at the floor or ceiling level of each
floor served, or at each direct opening in ~ach main dact and in each branch
at its junction with the main d.uct.
4. z. 6 (d) Aluminum ducts which pass through fl&ors of fir-e-resistive cons-
truction, unless encased as specified in section 4. Z.4 (c), shall have approve
fire daxnpers at the floors.
4. 2.. 6 (e) Dampers in systems used solely for exhaust of air to the outside
shall be installed in the branches so as not to interfere with it£ outward flow of
air in the main duct. Whet'e direction of exhaust. air floW' is upward,. subducts
at least 2..2 inche'S in length tnay be carried up inside the main duct from each
inle~ in lieu of dampers.
4 • .2. 7 F'I'esh air intakes.
4. 2.. 7 (a} Fresh air intakes shall be protected against exterior fire exposure
by approved fire doors, dampers or other suitable protection in accordance
with the degree of exposure hazard.
4. 2.. 7 (b) Fresh air intakes shall be protected by screens of corrosion
resistant material not larger than one-half inch mesh.
4. 2.. 8 Air inlet and outlet openings.
4. 2.. 8 (a) In a system having a total fan capacity in excess of 3t 000 cubic feet
per minute, discharge and exhaust air openings and recirculating air intakes
shall be located ·at least 3 inches above the floor 7 except that floor openings
may be permitted under seats in places of assembly having fixed seats.
4. 2.. 8 (b} When locat.ed les" than 7 feet above tne floor inlet and outlet
opening~ shall be pr·otected by a substantial grille or screen that has openings
through which a half-inch sphere will not. pass.
4. 2.. 9 Air filters.
4. z. 9 (a) Air filters shall be of approved type!! that will not burn freely or
emit large volume of smoke or other objectit;mable producb of combustien
when attacked by flames.
4. 2.. 9 (b) Liquid adhesive coatings used on air filters shall have a flaahpoint
not lower than 32.5 'F •, Cleveland open cup tester.
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TABLE A
learances to Combustible Material for Furnaces~ Boilers and Heat Exchangers
stalled in Rooms which Are Large in Cpmparison With Size of Appliance Except
s Provided in Note N 0 • 1 (This Table)
Minimum Clearance, Inches
Above and Jacket Projecting
Sides of Sides Front Flue Box Flue Pipe·
Bonnet or
Plenwn
and See or Draft or Vent
Rear Note 1 Hood Connector
• Automatically fired,
forced air or gravity
furnace, equipped with
limit control not con-
forming to Note z.. (This
Table),. but has been tested
by an approved agency and
found to have outlet air
temperatu:re n9t exceeding
ZSO degrees F.
Burning liquid fuel 2. 6
Burning gas fuel (This Z 6
is not to be construed to
prohibit clearances as
specified in the approval
requirements of the Ameri-
can Gas Association Labo-
ratories for the appliance, vent
pipe, or flue connector being installed)
Utilizing electricity Z 6
I. Automatically fired. forced
air or gravity furnace,
equipped with ZSO degrees F
temperature limit control
installed in accordance with
Note Z (This Table)
Burning liquid fuel 16 6
Burning gas fuel 16 6
Utilizing electricity li 6
II. Steam or Hot Water Heat
Exchanger -Steam not over
15 pounds gauge pressure
and hot water not more than
250 degrees F. 1
V. Automatically stoker fired,
forced air system equipped
with 250 degrees F temperature
limit control installed in accord-
ance with Note Z {This Table)and
barometric draft control. See
Note 3(This Table)
Burning solid fuel 6
1
6
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18
18
24
18
18
1
48
185
b
18
185
b
185
94
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18
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V. Heating Boilers--
Steam boilers oper-
ating at. not over 15
pounds gauge pressure
and hot water b9ilers
operating at not in
excess of Z.50 degrees
F. of the water-wall
type or having a jacket
or lining of masonry or
other satisfactory mater-
ial.
Burning liquid fuel
Burning gas fuel
Burning solid fuel
VI. Furnaces and Boilers,
other than above.
Notes:
Burning liquid fuel
Burning gas fuel
Burning solid fuel
Above and
Sides of
Bonnet or
Plenum
6
6
6
18
18
18
Minimum Clearance, Inches
Jacket
Sides
and
Rear
6
6
6
18
18
18
Front
See
Note 1
Z.4
18
48
48
18
48
Projecting Flue
Flue Box Pipe
or Draft or Vent
Hood Oonnecto
185
94 .. ~
18
94
18
1'85
94
18
18
94
18
1. Front clearance shall be sufficient for servicing the burner and furnac ~" z.. Limit control. that has been tested by an approved agency and that can-
not be set higher than 2.50 degrees F. installed not more than 10 inches above
the top surface of the heat exchanger in a supply plenum that extends at least
1,? inches above the tGp surface of the heat exchanger.
· 3. Barometric draft control operated by draft intensity and permanently
set to limit the draft to a maximum intensity of o. 13 inches of w.ater gauge.
4. This clearance may be reduced to 6 inches for gas burning furnaces
and boilers that have been tested by an approved agency and found to have flue
gas temperatures not exceeding 550 F. This clearance does not apply to
approved Type B gas vents used and installed in accordance with the conditions
of such approval. s. For liquid fuel burning furnaces and boilers that are approved apec1£i ...
cally for installation with lesser clearances flue pipes may be installed in
accordance with the conditions of such approval.
6. If limit control cannot be set higher than 2.50 degrees F. but note 2 is
not otherwise complied with, this clearance shall be 6 inches.
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ARTICLE V.
ENFORCEMENT AND ADMINISTRATION
38-5. 1 The Building Inspector for the City of Lul!>bock shall administer and
enforce this Ordinance, including the inspections and issuing the certificate of
compliance as hereinafter provided.
38 ... 5. 2 No person shall install, construct, enlarge, alter, and change any Warm
Air Heating and Ventilating and Heating System without first obtaining a permit to o
such wor:k from the Building Inspector of the City of Lubbock. At the time of
making application for any such permit information as to the type of Warm Air
Heating and Ventilating and Heating System to be installed, constructed, enlarged,
altered, and changed shall be furnished. The Inspector before issuing such perm·
shall collect the sum of ONE DOLLAR ($1. 0.0) in addition to any other fees which
such Inspector shall be required to collect. The Building Inspector shall duly
receipt the collection of such fee and deliver to applicant a copy thereof, and also
note on the permit that said fee bas been paid.
38 ... 5. 3 The Owner or Contractor in charge of constructing and installing a Warm
Air Heating and Ventilating and Heating System or in charge of altering, enlarging
and changing an existing Warm Air Heating and Ventilating and Heating System,
shall notify the Building lnspector when the work is commenced and no water,
gas or electrical connection shall be covered or otherwise concealed until after
the work has been inspected and approved by the Building Inspector. After the
rough duct work vents and flues as herein required by this Ordinance have been
completed and before any insulation has been installed, the Owner or Contractor
shall notify the Building Inspector and no work shall be concealed until it has
been inspected and approved by the Building Inspector. When all work has been
completed the Owner or Contractor in charge shall notify the Building Inspector
who shall thereupon make a final inspection of all work and indicate his approval.
38-5.4 The Building Inspector will indicate his approval after each inspection
by placing a tag in a convenient location and indicating thereon that the inspection
has been made and that the W(!)rk may be concealed.
If in the opinion of the Building Inspector the work at any stage of inspection
is not in compliance with the terms of this Ordinance, the Owner .or Contractor
in charge shall thereupon make any and all necessary CG>rrections and when the
corrections are completed shall notify the Building Inspector that such work is
ready for re-inspection. For all re-inspections the Building Inspector shall
charge the sum of ONE DOLlAR ($1. 00} and such fee must be paid in advance
before the re-inspection is made.
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38-5.5 No person, firm or corporation shall herea.Ber construct, install, alter,
enlarge, repair and change any Warm Air Heating and v,ntilating and Heating
System for any other person, firm or corporation, until such person, firm or
corporation responsible for such construction, installati9n, alteration, enlarge-
ent, repairing or changing Warm Air Heating and Ventil~ting and Heating System,
shall have executed and delivered to the Building Inspector of the City of Lubbock,
surety bond in the amount cf ONE THOUSAND AND N0/100 {$1000. 00) DOLlARS
a yable to the City of Lubbock for the use of any and all persons, firms or corpora
ions who may sustain any damage or legal injury by failure of the principal of said
ond to carry out the provisions of this Ordinance. Such bond shall be with a reco ..
nized and reliable surety company authorized to do business in the ~tate, and
hall be conditioned upon the faithful performance of all such work entered upon or
ontracted for in strict accordance and c.9mpliance with the terms, requirements
nd provisions of this Ordinance and other Ordinances of the City. Such bond shall
e further conditioned that such person, firm or corporation shall r·emedy any defe
ue to faulty worlananship in the construction, installation, alteration, enlarging,
epairing, or changing of any Warm Air Heating and Ventilating and Heating System
r due to defective material furnished or used in such work, without cost to such
erson, firm or corporation. All sureties on any bond required by this Ordinance
hall be liable for breach thereof by the principal to the owner of the property not
o exceed the face amount of such bond, and provided further, that liability on
uch bond for the full amount thereof shall continue until the surety has given the
ity notice in writing that said bond has been cancelled in which event the person,
irm or corporation engaged in the construction, installation, alteration, enlarge-
ent, repairing or changing of Warm Air Heating and Ventilating and. Heating
ystems shall not pursue work further until a bond for the full amou~t is filed and
pproved. All bonds shall be for a period expiring at midnight December 31st of
he current calendar year.
38-5.6 Each person, firm or corporation required to fi'le a bond under the terms
of this Ordinance shall upon the filing of such bond be issued a card signed by the
Building Inspector showing that same has been filed. Such card must be in the
possession of the person responsible for the work governed by this Ordinance, and
be produced for examination upon request of the Building Inspector or any person
for whom the work is being performed. Any person, firm or ~orporation subject
to the terms of this Ordinance who finds it necessary to have more than one such
card may request the Building Inspector to issue additional cards, and shall pay
to said Building Inspector the sum of twenty -five ($. 25)cents for each additional
card so requested.
ARTICLE VI.
CITY ASSUMES NO LIABILITY FOR DEFECTIVE WORK
This Ordinance shall not be construed to relieve from or lessen the responsibi
ity of any person performing or doing any work covered hereunder, for damages
o any person or property by defects therein, nor shall the City be held as assumin
ny liability by reason of the inspection authorized by this Ordinance or certificate
ssued as provided by this Ordinance or by reason of any of the matters or things
er:ein provided for and regulated.
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-AR-TICLE VII.-.
SEP AR..ABlLIT Y
If any section, sub-section. sente~ce, clause, phrase or portion .of this
Ordinance is for any reason held invalid or unconstitutional by a Court of compe-
tent jurisdiction. such invalid portion shall be deemed a separate, distinct and
independent provision, and such holding shall not affect the validity of the remain•
ing portions hereof. ·
._AR:TIC LE"-nrt.:
PENALTY
Any person, firm, or corporation violating any of the provisions of tlis
Ordinance shall. upon conviction, he fined in any sum not exceeding TWO
HUNDRED AND N0/100 {$200. 00} DOLlARS, and each day a violation continuetJ
shall constitute and be a separate offense.
S~OT ION :'t-WO
PUBLICATION
The City Secretary is hereby authorized and directed to publish the descriptiv
caption together with the penalty clause of this Ordinance as an alternative method
of publication provided by law.
AND IT IS SO ORDERED.
Passed by the Commission on first reading this the lOday of Januarr 11-------· 1957. --
Passed by the Commis~ion on second reading this the 24 day of January
-----·' 1957.
il: City Attorney
THE STATE OF TEXAS COUNTY OF LUBBOCK ~ Erle Marie Brown Before me a Notary Public in and for Lubbock County, Texas, on Parker F. Prouty this day personally appeared , President, Ptlbmher, of the Avalanche-Journal Publishing Company, publishers of The Lubbock Morning Avalanche--Lubbock Evening Journal-Sunday Avalanche-Journal, who after being by me duly sworn did depose and say that said newspaper has been _published continuously for more than Legal Notice 9788 fifty-two weeks prior to the first insertion of thi , No. at Ordinance No. Lubbock County, Texas, and that the attached printed copy of the._ ________ _ Avalanche-Journal is a true copy of the original and was printed in the said paper _________ _ on the following dates: January 30 and February 6, liS.Z v ~ .._/<. IP'l a< ---:L7' Avalanche-Journal Publishing 19tlrresident P.,tJny ~ Subscribed and swom to before me this day of February , 19.l1_ ~h -d ~__; ·~' ~ciryPublic, Lubbock c=mrtu-a.if\lelM Notary 9vbllc m """' ,._.. l .. ~o.~o.~..c. ~~"···-~· .. ' I I ~ 212~