2000
UMC CheckList
===================================
The
following comments based on the 1997 edition of the Uniform Mechanical
Code (UMC) will be resolved before a permit is issued. This correction
list is not a building permit. The approval of plans and specifications
does not permit the violation of any section of the Uniform Mechanical
Code or any federal, state or local regulation.
A. General
Requirements top
____ Provide
information on the listing of the equipment installed. (Section
302.1)
____ Provide
the manufacturer's installation instructions for the ___________.
____ Unvented
or direct fired fuel-burning equipment are only permitted in Group
F, S or U Occupancies. (Section 303.1.1)
____ Equipment
that is installed in Group S, Division 3, 4 or 5 and Group U, Division
1 Occupancies, and has a flame, generates a spark or uses a glowing
ignition source open to the space in which it is installed, shall
be elevated so the source of ignition is at least 18 inches (457
mm) above the floor. (Section
308)
____
Appliances installed in garages where they may be subjected to mechanical
damage shall be suitably guarded against such damage by being installed
behind protective barriers or by being elevated or located out of
the normal path of vehicles.
(Section 308)
____ Boilers
not listed for closet or alcove installation shall be installed
in a room having a volume at least 16 times the total volume of
the boiler. Note: When computing the room volume, a maximum height
of 8 feet (2438 mm) is allowed. (Section 304.2)
____ The
equipment installed outside the building shall be listed for outdoor
installations or be in an approved weatherproof enclosure. (Section
304.3)
____ The
mechanical plan review and approval cannot be completed until the
approved architectural plans showing all of the fire-rated corridor
walls, occupancy separation walls and division walls, shaft walls,
horizontal exit walls, etc., are submitted for reference use.
____ It
should be noted on the plans that each piece of heating, ventilating
and air-conditioning equipment shall be labeled to the space served
as required by Section 304.5.
____ Show
condensate lines on plans and where they will terminate. (Section
310.1)
____ Overflow
drains from air-conditioning units should discharge to conspicuous
locations as required by Sections 310.2 and 1106.12.
____ Show
location of heating, cooling and ventilating equipment.
____ Furnish
the mechanical equipment schedule identifying the equipment manufacturer's
name, model number, capacity, etc.
____ Provide
duct layout showing size, duct gage (if metal) and grill (register)
locations.
____ All
mechanical equipment shall be listed and labeled by an approved
agency. If not, complete information on the equipment, including
manufacturer's data sheets, test reports, etc., shall be provided
to allow for evaluation. Testing by an approved agency will be required
before approval is granted.
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B. Heating Equipment top
____ Listed
heat-producing equipment shall maintain the required clearances
to combustible construction specified in the listing. Devices such
as doorstops or limits, closers, drapery ties or guards shall not
be used to provide the required clearances. (Section 304.1)
____ A warm-air furnace shall not be located in a room used or designed
to be used as a bedroom, bathroom, closet or in any enclosed space
with access only through such room or space. (Section 904.5)
____ Vented Wall Furnaces: Shall not be installed closer than 6
inches from an inside corner and located so a door cannot swing
to within 12 inches perpendicular to the air inlet or outlet opening.
(Section 314.1)
____ Provide
a door at least 24 inches (610 mm) wide and large enough to remove
the largest appliance in the closet, alcove or basement. (Section
903)
____ Provide
a service space of not less than 30 inches (762 mm) deep and the
height of the furnace, but not less than 30 inches (762 mm), at
the front or service side of the appliance with the door open. (Section
903)
____ Provide
a 120-volt receptacle within 25 feet (7620 mm) of and on the same
level as the equipment. (Section 309)
____ Provide
lighting to all equipment required by the Uniform Mechanical Code
to be accessible or readily accessible.
____ Equipment
designed to be fixed in position shall be securely fastened in place
as required by Section 304.4.
____ Liquefied
petroleum gas-burning appliances shall not be installed in a pit
or basement. (Section 304.6)
____ Fuel-burning
condensing appliances should be provided with condensate drains
in compliance with Section 310.
____ Detail
of furnace enclosure and blower-type furnace should be shown on
the plans. The following provisions should be considered (Section
904):
1. The
compartment should be at least 12 inches (305 mm) wider than
the furnace.
2. Furnaces
should have a minimum 3 inches (76 mm) working space on sides,
back and top.
3. Furnaces
should have at least 6 inches (152 mm) clearance along the entire
front of the fire box.
____ Details
of equipment installed in attic shall be shown on the plans. The
following provisions should be considered (Section 908):
1. Attics
shall have an access space large enough to allow the largest
piece of equipment to be removed, with a minimum of 22 inches
by 30 inches (559 mm by 762 mm).
2. Clearances
from combustible construction as recommended in the manufacturer's
installation instructions shall be maintained.
3. Distance
from the passageway access to the furnace shall not exceed 20
feet (6096 mm).
4. Passageway
to the furnace shall be unobstructed and shall have continuous
solid flooring not less than 24 inches (610 mm) wide from the
access opening to the furnace.
5. A
level service space at least 30 inches (762 mm) deep and 30
inches (762 mm) wide located at the front or service side of
the equipment.
____ Access
to equipment on roof should be shown on the plans. When a ladder
is provided, the following features should be indicated (Section
910):
1. Ladder
side railings should extend at least 30 inches (762 mm) above
roof edge or parapet wall.
2. A
14-inch-wide (356 mm) ladder should be provided with rungs not
more than 14 inches (356 mm) on center.
3. Ladder
should provide 6 inches (152 mm) of toe space.
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C. Ventilation Air Supply
top
____ Provide
makeup air for the ventilation system. (Section 505.3)
____ The
makeup air system shall be electrically interlocked with the exhaust
system. (Section 509.9)
____ Outside
air shall not be obtained from the following locations (Section
906.6):
1. Closer
than 10 feet (3048 mm) from a vent serving fuel-burning equipment.
EXCEPTION:
Listed outdoor appliance equipped with outdoor air inlet and
appliance vent.
2. Closer
than 10 feet (3048 mm) from a plumbing drainage system vent
or from an exhaust system outlet, unless the outlet is 3 feet
(914 mm) above the outside air inlet.
3. Where
it will pick up objectionable odors, fumes or flammable vapors;
or when it is less than 10 feet (3048 mm) above the surface
of any abutting public way or driveway; or when it is in a horizontal
position in a sidewalk, street, alley or driveway.
4. A
hazardous location.
5. An
insanitary location.
____ Return
air shall not be obtained from a corridor, exit passageway or exit
enclosure required by the Building Code to be of fire-resistive
construction.
____ Return
air shall not be obtained from a dwelling unit, guest room or patient
room other than the room in which the air originates.
____ Return
air shall not be obtained where it will pick up objectionable odors,
fumes or flammable vapors. (Section 906.6.2)
____ Return
air shall not be taken from (Section 906.6):
1. A
hazardous location,
2. An
insanitary location,
3. A
closet,
4. A
toilet room,
5. A
bathroom,
6. A
kitchen and
7. A
refrigeration machinery room.
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D. Combustion Air top
____ Combustion
air provisions should be shown on the plans for the fuel-burning
equipment. Sizes of openings and/or ducts and their points of termination
should be indicated in compliance with Chapter 7.
____ An
upper combustion air opening or duct should be provided and located
within the upper 12 inches (305 mm) of the enclosure. In addition,
a lower combustion air opening or duct should be provided and located
within the lower 12 inches (305 mm) of the enclosure. (Section 702)
____ One
combustion air opening sized at 1 square inch per 4,000 Btu/h input
of the appliance or appliances, but not smaller than the vent flow
area, shall be allowed within the upper 12 inches (305 mm) of the
enclosure. When this is done, all of the combustion air shall be
taken from the outdoors and the appliance shall have a minimum clearance
of 1 inch (25 mm) on the sides and back, and 6 inches (152 mm) on
the front. (Table 7-1)
____ Upper
and lower combustion air ducts should not be joined as shown on
the plans, but should be completely separated as required by Section
704.1.6.
____ Upper
combustion air ducts should extend horizontally or upward to the
outside or to the attic as required by Section 703.1.2.
____ Fire
dampers or volume dampers should not be installed in combustion
air ducts. (Section 702.2)
____ If
an attic is used as a source of combustion air, the following provisions
should be indicated on the plans (Section 703.1.2):
1. The
attic should have at least 30 inches (762 mm) vertical clear
height at its maximum point.
2. Attic
ventilation should be sufficient to provide the required volume
of combustion air.
3. Combustion
air openings should be provided with a galvanized steel sleeve
(No. 26 gage) extending 6 inches (152 mm) above the top of the
ceiling joists and insulation. Combustion air ducts should also
be extended similarly.
4. Neither
end of upper or lower combustion air ducts should be screened.
____ If
an under-floor crawl space is utilized to provide for the combustion
air, compliance with the following requirements should be verified
(Section 703.2):
1. Only
the lower combustion air opening or duct should be connected
to the under-floor area.
2. The
under-floor area should have an unobstructed opening(s) to the
exterior of at least twice the area of the required air openings.
3. The
height of the under-floor space should be in compliance with
the requirements of the UBC and should be without obstruction
to the free flow of air.
____ Combustion
air for blower-type furnaces should not be obtained from the same
area as the return air (within the building) unless complete compliance
with all of the provisions of Section 906.6.5(3) is clearly demonstrated.
____ Combustion
air duct sizes should be at least 1 square inch per 2,000 Btu/h
(109 mm2/W) per duct, since ducts are not vertical, as
required by Table 7-1.
____ Combustion
air openings or ducts should be at least 1 square inch per 1,000
Btu/h (2.20 mm2/W) per opening or duct, since combustion
air is obtained from the inside of the building, as required by
Table 7-1. Note: Minimum of 100 square inches (0.064 m2)
for each opening or duct.
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E. Vents and Chimneys top
____ The
factory-built chimney shall be installed in accordance with the
terms of its listing and the manufacturer's installation instructions.
(Section 812.1)
____ Provide
the manufacturer's installation instructions for the factory-built
chimney.
____ Terminate
the vent at least 4 feet (1219 mm) from a property line except a
public way. (Section 806.6)
____ Terminate
the vent on the direct vent appliance, with an input less than 50,000
Btu/h (19 kW), at least 2 feet (610 mm) from a property line except
a public way. (Section 806.6, exception)
____ Portions
of venting systems that extend through occupied and storage spaces
shall be enclosed. (Section 804)
____ A
combustion products vent, vent connector, chimney or chimney connector
shall not extend into or through an air duct or plenum. (Section
804)
____ Gravity
flue vents should not slope more than 60 degrees from the vertical.
In addition, the total horizontal run of the vent (less than 45
degrees from horizontal) and the connector should not exceed 75
percent of the vertical height of the vent, as required by Section
805.
____ The
gravity flue vent connector should not slope less than 1/4
inch per foot [1/4 unit vertical in 12 units
horizontal (2% slope)] as required by Section 805.
____ Gravity
flue vent sizes should not be less than the size of the vent collar
on the appliance or less than 7 square inches (4516 mm2)
[3-inch (76 mm) diameter] as required by Sections 808.
____ Detail
of the chimney or vent roof penetration should be provided to ensure
compliance with the provisions of Chapter 8.
____ Show
the termination of the appliance vents above the roof.
____ Factory-built
chimneys for residential fireplaces should terminate at least 3
feet (914 mm) above the roof and 2 feet (610 mm) above any part
of the building that is within 10 feet (3048 mm) of the chimney,
as required by Table 8-4.
____ The
vent for the wall furnace should be a Type BW gas vent. The first
ceiling plate above the furnace in a stud cavity enclosing the vent
should be ventilated. Each subsequent ceiling plate should be fire
stopped by the fire-stop spacers furnished with the vent.
____ When
the BW vent extends through an attic in a single-story building,
a metal sleeve not less than No. 26 manufacturer's standard gage
steel, having the same area as the opening through the ceiling plate,
should be extended to a point at least 12 inches (305 mm) above
the top of the ceiling plate or 2 inches (51 mm) below the roof
sheathing, whichever is the lesser.
____ Type
BW gas vents should extend from the header plate to a point above
the highest ceiling plate without any offsets or crossovers.
____ A
sheet metal barrier should be installed between a Type BW gas vent
located in a stud space and wall covering constructed of perforated
lath, metal lath or building paper.
____ Type
BW wall heater vents should terminate at least 12 feet (3658 mm)
above the bottom of the furnace.
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F. Comfort Cooling top
____ Condensate
shall be collected and discharged to an approved plumbing fixture
or disposal area. (Sections 310.1 and 1106.10)
____ Overflow
condensate disposal shall be provided when condensate or defrost
liquids are generated in an attic or furred space and damage may
result from overflow. (Section 1106.12)
____ The
overflow discharge lines shall terminate at an approved location
where they can be readily observed. (Section 1106.12)
____ Corridors,
required to be of fire-resistive construction by Chapter of the
Building Code, shall not be used to convey air to or from rooms.
(Section 602.1)
____ Equipment
serving different areas of a building other than where it is installed
shall be marked in an approved manner to permanently and uniquely
identify the piece of equipment and area served. (Section 304.5)
____ Access
to equipment on roof should be shown on the plans. When a ladder
is provided, the following features should be indicated (Section
910.8):
1. Ladder
side railings should extend at least 30 inches (762 mm) above
roof edge or parapet wall.
2. A
14-inch-wide (356 mm) ladder should be provided with rungs not
more than 14 inches (356 mm) on center.
3. Ladder
should provide 6 inches (152 mm) of toe space.
____ A
compressor or condensing unit supported from the ground should rest
on a concrete or other approved base extending not less than 3 inches
(76 mm) above the adjoining ground level. (Section 1106.2, exception
2)
____ It
should be noted on the plans that ceiling spaces used as return-air
plenums shall fully comply with all the provisions of Sections 602.1
and 602.2.
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G. Ducts top
____ Factory-made
air ducts shall be listed and installed in accordance with the terms
of their listing and the requirements of UL 181. (Section 601.6)
____ Provide
the installation instructions for the factory-made air ducts.
____ Corridors
shall not be used to convey air to or from rooms if the corridor
is required to be of fire-resistive construction by Chapter of the
Building Code. (Section 601.1.1)
____ Insulation
of supply- and return-air ducts shall comply with Section 604 and
Table 6-4. The following provisions should be considered:
1. Only
approved material meeting the requirements of UL 181 shall be
installed within ducts or plenums.
2. Duct
liners in systems operating at more than 2,000 feet per minute
(10.2 m/s) shall be fastened with both adhesive and mechanical
fasteners, and exposed edges shall have adequate treatment to
withstand the operating velocity.
3. External
duct installation shall be labeled with the manufacturer's name,
the R value, and the flame-spread index and smoke-developed
index.
____ Duct
work shall be constructed in accordance with Chapter 6 of the UMC
or applicable Sheet Metal and Air Conditioning Contractors National
Association standards. Please specify what method will be used on
the plans.
____ Provide
a schedule of the metal gages that the duct work will be constructed
of.
____ Provide
all duct layouts showing all registers and their types.
____ Show
location, type and rating of all required fire and smoke dampers.
____ Fire
dampers should be equipped with access doors, with a label reading
"FIRE DAMPER," as required by Section 606.5.
____ When
a heating or air conditioning system is designed to operate with
the fans "on" during a fire, dynamic-type fire dampers
should be used. (Section 605.2)
____ It
should be noted on the plans that ceiling spaces used as return-air
plenums shall fully comply with all the provisions of Sections 602.1
and 602.2.
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H. Commercial-Cooking top
____ Show
commercial cooking hood and exhaust duct on the plans and show all
dimensions of both items.
____ Show
cubic feet per minute (cfm) rating of commercial cooking exhaust
blower on plans.
____ Show
makeup air unit on plans. Unit shall be interlocked with the exhaust
fan.
____ Show
cfm rating of makeup air unit on plans.
____ The
exhaust air from the Type I hood shall be diverted so that there
is no impingement on the roof. Show on plans. (Section 508.4)
____ Show
where the cleanouts in the grease duct will be located.
____ Provide
a detail of the 1-HR rated shaft around the grease duct that complies
with the UMC. If you are using a rated wrap around the duct, instead
of the shaft, provide complete listing information on the wrap.
(Section 508.4)
____ Show
the size of the shaft around the grease duct.
____ Design
the grease duct system in a manner to provide an air velocity within
the duct of not less than 1,500 feet per minute (7.5 m/s) and not
to exceed 2,500 feet per minute (12.7 m/s). (Section 508.6)
____ What
type of cooking equipment will be used under the Type I hood?
____ What
type of cooking equipment will be used under the Type II hood?
____ Solid-fuel
charbroiler should be provided with a separate exhaust system, independent
of all other systems serving other cooking appliances, as required
by Section 509.7.1.
____ Provide
makeup air to the commercial cooking hood as required by Section
509.9.
____ Unless
a listed exhaust hood is installed, an exhaust outlet shall be provided
for each 12-foot (3658 mm) section of the hood. (Section 509.10)
____ The
exhaust outlet for a grease duct serving a Type I hood shall terminate
at least 2 feet (610 mm) above the roof surface. (Section 508.9)
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I. Refrigeration top
____ Plans
should indicate the type and quantity of refrigerant to be used
in the system.
____ A
compressor or condensing unit supported from the ground should rest
on a concrete or other approved base extending not less than 3 inches
(76 mm) above the adjoining ground level. (Section 1106.2)
____ An
unobstructed, readily accessible opening and passageway not less
than 36 inches (914 mm) wide by 6 feet 8 inches (2032 mm) high should
be provided to compressors, valves and other portions of the system
requiring routine maintenance. (Section 1106.3)
____ Permanent
lighting fixtures should be installed for all refrigeration equipment
required to be accessible or readily accessible. Lighting fixtures
should provide illumination to safely perform required tasks for
which access is provided. Lighting controls should be provided at
the access entrance. (Section 1106.4)
____ Refrigeration
systems and portions thereof should not be located in an elevator
shaft, dumbwaiter shaft or a shaft having moving objects therein,
nor in a location where it will be subject to mechanical damage.
(Section 1106.5)
____ The
room or space that condensing units are located in should be ventilated
by one of the following means:
1. Permanent
gravity ventilation openings of not less than 2 square feet (0.19
m2) net free area opening directly to the outside of
the building or extending to the outside of the building by continuous
ducts.
2. A
mechanical exhaust system arranged to provide a complete change
of air in such room or space at least every 20 minutes and to discharge
to the outside of the building.
Except
such ventilation is not required for condensing units located
in a room or space where such units are located within a refrigeration
machinery room complying with the specified ventilation required
in Section 1107; where the cubical content exceeds 1,000 cubic
feet per horsepower (8.05 m3/kW); or where the room
or space has permanent gravity ventilation having an area of 2
square feet (0.19 m2) or more to other rooms or openings
exceeding 1,000 cubic feet per horsepower (8.05 m3/kW).
(Section 1107.7)
____ Refrigeration
systems or portions thereof should not be located within a required
exit enclosure.
____ Refrigeration
compressors exceeding 5 horsepower (17.6 kW) rating should be located
at least 10 feet (3048 mm) from an exit opening in a Group A; Group
B; Group E; Group I; or Group R, Division 1 Occupancy unless separated
by a one-hour fire-resistive occupancy separation. (Section 1106.8)
____ Machinery
rooms should be provided for refrigeration systems when:
1. The
quantity of refrigerant in a single system exceeds the amounts
in Table 11-A,
2. The
system includes direct-fired absorption systems except for lithium
bromide absorption systems using water as the refrigerant,
3. A
Group A1 system having an aggregate compressor horsepower of 100
(351.6 kW), or
4. The
system contains other than a Group A1 refrigerant.
EXCEPTIONS:
1. Lithium bromide absorption systems using water as the refrigerant.
2.
Ammonia-water absorption unit systems installed outdoors, provided
that the quantity of refrigerant in a single system does not
exceed Table 11-A amounts and the discharge is shielded and
dispersed.
3. Systems
containing less than 300 pounds (136 kg) of refrigerant R-123
and located in an approved exterior location.
4. Systems
containing less than 35 pounds (16 kg) of refrigerant R-717
and located in an approved exterior location.
____ Refrigeration
machinery rooms should be of such dimensions that all system parts
are readily accessible with adequate space for maintenance and operations,
and an unobstructed walking space at least 3 feet (914 mm) in width
and 6 feet 8 inches (2032 mm) in height should be maintained throughout,
allowing free access to at least two sides of all moving machinery
and approaching each stop valve.
____ Access
to refrigeration machinery rooms should be restricted to authorized
personnel and posted with a permanent sign. (Section 1107.2)
____ Exits
should comply with Chapter 10 of the Building Code for special hazards.
(UMC Section 1107.3)
____ Refrigeration
machinery rooms should have approved refrigerant-vapor detectors,
located in an area where refrigerant from a leak is likely to concentrate,
and should activate visual and audible alarms. Alarms should be
activated at a value not greater than one half the immediately dangerous
to life or health (IDLH), or measurement consistent therewith; the
permissible exposure limit (PEL), or measurement consistent therewith;
or 25 percent of the lower flammability limit (LFL), whichever is
less. (Section 1107.4)
____ Refrigeration
machinery rooms should be separated from other portions of the building
as required in the special hazards provisions of the Building Code,
and penetrations should be sealed to inhibit the passage of refrigerant
vapor. (UMC Section 1107.5)
____ Refrigeration
machinery rooms should be provided with dedicated mechanical exhaust
systems. The exhaust systems should have the capacity to achieve
each of the following (Section 1108.2):
1. Continuously
maintain the refrigeration machinery room at 0.05-inch water
gage (12.4 Pa) negative relative to adjacent spaces.
2. Continuously
provide 0.5 cubic foot per minute of airflow per gross square
foot (m2) [2.54 L/(s•m2)] of floor area
within the refrigeration machinery rooms.
3. Limit
the temperature rise within the refrigeration machinery room
to a maximum of 104°F (40°C).
4. Provide
emergency purge of escaping refrigerant.
____ Exhaust
from refrigeration machinery room ventilation systems should be
discharged at least 20 feet (6096 mm) from a property line or openings
into buildings. Discharges capable of exceeding 25 percent of the
LFL or 50 percent of the IDLH should be equipped with approved treatment
systems to reduce the discharge concentrations to these values or
lower. (Section 1108.7)
____ Makeup
air intakes to replace the exhaust air from a refrigeration machinery
room should be provided to the room directly from outside the building.
Intakes should be fitted with backdraft dampers or similar approved
flow-control means to prevent reverse flow. Distribution of makeup
air shall be arranged to provide thorough mixing within the refrigeration
machinery room to prevent short circuiting of the makeup air directly
to the exhaust. (Section 1108.9)
____ Stop
valves should be installed in the refrigerant piping of a refrigeration
system at the following locations (Section 1112.1):
1. At
the inlet and outlet of a positive-displacement-type compressor,
compressor unit or condensing unit.
2. At
the refrigerant outlet from a liquid receiver.
3. At
the refrigerant inlet of a pressure vessel containing liquid refrigerant
and having an internal gross volume exceeding 3 cubic feet (85 L).
Valves will not be required in:
a. Systems
with nonpositive-displacement compressors.
b. Systems
having a pump-out receiver for storage of the charge.
c. Systems
containing less than 110 pounds (50 kg) of Group A1 refrigerant.
d. Self-contained
systems do not require a stop valve at the inlet of the receiver.
____ The
size and length of the discharge pipe from the pressure relief device
of fusible plug should comply with Section 1118. Show the proper
calculations on plans.
____ Ammonia
systems should be provided with an emergency discharge into a tank
of water provided exclusively for ammonia absorption. Emergency
discharge systems should meet the following (Section 1120):
1. At
least 1 gallon (379 mL) of fresh water should be provided for
each pound of ammonia in the system.
2. The
water used should be prevented from freezing without the use
of salt or chemicals.
3. The
tank should be substantially constructed of not less than 1/8
inch (2.51 mm) or No. 10 M.S.G. steel.
4. The
horizontal dimensions of the tank should be equal to or less
than one half of the height.
5. The
tank should have a hinged cover or, if of the enclosed type,
should have a vent hole at the top.
6. Pipe
connections should be through the top of the tank.
7. The
discharge pipe from the pressure-relief valves should discharge
ammonia in the center of the tank near the bottom but not more
than 30 feet (9144 mm) below the surface of the water.
8. This
does not apply to ammonia-water absorption unit systems installed
outdoors serving a dwelling unit provided that the discharge
is shielded and dispersed.
____ Approved
refrigerant-vapor detection and alarm systems complying with Section
1120 should be installed with the refrigeration system. Show the
proper details on the plans.
____ Specify
on the plans that the refrigeration equipment, valves and switches
are properly identified and labeled per UMC Standard 11-2 and Sections
1107.2, 1108.6, 1108.4, 1109.4 and 1112.4.
____ Cooling
towers, evaporative condensers and fluid coolers having combustible
exterior surfaces should be protected with an approved automatic
fire-extinguishing system when such equipment is located on roofs.
(Section 1126)
____ Seismic
restraints should be provided for cooling towers, evaporative condensers
and fluid coolers as required by Chapter 16 of the Building Code.
(Section 1127)
____ Water
supply and backflow protection provided for cooling towers, evaporative
condensers and fluid coolers should be as required by the Plumbing
Code. (Section 1128)
____ Drains,
overflows and blowdowns provided for cooling towers, evaporative
condensers and fluid coolers should have indirect connection to
an approved disposal location. (Section 1129)
____ Cooling
towers, evaporative condensers and fluid coolers should be located
where their plumes cannot enter occupied spaces. Plume discharge
should be 5 feet (1524 mm) above or 20 feet (6096 mm) away from
any ventilation inlet to a building. (Section 1131)
____ Chemical
treatment systems provided for cooling towers, evaporative condensers
and fluid coolers should comply with the Fire Code. (Section 1130)
____ Cooling
towers, evaporative condensers and fluid coolers should be provided
with a vibration switch to shut off fans operating with excessive
vibration. In climates commonly subject to electrical storms, lightning
protection should be provided on roof-mounted equipment. (Section
1132)
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J. Product Conveying Systems
top
____ Dust-
or flammable-vapor-collection systems shown on the plans should
fully comply with the requirements of Chapter 5. The following comments
could be used as a guide for the information that should be submitted:
1. A
manually operated remote control should be provided to shut
off fans and blowers. (Section 503.1)
2. Electrical
dust- or flammable-vapor-collection equipment should be interlocked
with the ventilation system so that equipment cannot operate
unless the ventilation fans are in operation, as required by
Section 503.1.
3. Fans
should be of nonferrous or nonsparking material. (Section 503.2)
4. Ventilation
equipment should bear an identification label stating the ventilation
rate for which the system was designed. (Section 503.2)
5. Ducts
should extend directly to the exterior of the building without
entering other spaces. (Sections 505)
6. The
velocity of air within the duct should not be less than that
set forth in Table 5-A. (Sections 505.2)
7. Makeup
air should be provided to replace exhaust air as required by
Section 505.3.
8. Steel
hoods should have a base metal thickness not less than that
specified in Section 505.4.
9. Aluminum
ducts should not be used in dust- or flammable-vapor-collection
systems. (Section 610)
10. Steel
ducts should comply with Tables 6-7 and 6-8. (Section 610.2)
11. Rectangular
ducts should not be used in dust-collection systems. (Section
610.2)
12. Fittings
should not be less than two gages thicker than the thickness
required by straight runs. (Section 610.2)
13. Branches
should connect to main ducts at an angle not exceeding 45 degrees.
(Sections 610.3)
14. Accessible
cleanouts should be provided at 10-foot (3048 mm) intervals,
at changes in direction and at sprinkler heads, if any, as required
by Section 610.4.
15. Ducts
conveying explosive dusts should have explosion vents. (Section
610.4)
16. Fire
sprinkler heads should be installed within ducts exceeding 10
inches (254 mm) in cross-sectional dimension when conveying
flammable vapors. Sprinklers should be installed at 12-foot
(3658 mm) intervals in horizontal ducts and at changes in direction.
Sprinklers should also be installed at the top and at alternate
floor levels in vertical runs. (Section 610.6)
17. Ducts
should have clearances from combustibles as required by Section
610.7.
____ The
garage ventilation system is to terminate not less than 10 feet
(3048 mm) from a property line; 2 feet (610 mm) from an exterior
wall or roof; 10 feet (3048 mm) from openings into the building;
10 feet (3048) above the adjoining grade. Show on plans. (Section
508.9)
____ The
product-conveying exhaust duct is to terminate per Section 508.9
of the UMC. Show on plans.
____ What
is being ventilated through the fume hood?
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K. Boilers top
____ Provide
two exits or exit-access doors to the boiler room that is over 500
square feet (46.45 m2) and the largest piece of fuel-fired
equipment is over 400,000 Btu/h (117 228 W). (UBC Section 1007.7.1)
____ Provide
a floor drain in the boiler room. (Section 1019)
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L. Water Heaters top
____ Fuel-burning
water heaters shall not be installed in bathrooms or bedrooms or
in a closet with the only access through a bathroom or bedroom unless:
1. Water
heaters having direct vent systems.
2. Water
heaters installed in a closet that has a weather-stripped solid
door with an approved door-closing device and designed exclusively
for the water heater and where all air for combustion and ventilation
is supplied from the outdoors.
3. Water
heaters of the automatic storage type installed as a replacement
in a bathroom when specifically approved, properly vented and
supplied with adequate combustion air.
____ The
pressure-temperature relief valve on the water heater shall not
terminate to the plumbing drainage system. (Section 1004.2)
____ Terminate
the pressure-temperature relief valve on the water heater where
it will not cause personal injury or property damage and where it
is readily observed by the building occupants. (Section 1004.2.1)
____ Water
heaters or hot water storage tanks that are installed in locations
where leakage will cause damage shall be installed in a metal pan
(Sections 1004.3 and 1004.3.1). Note the following:
1. The
pan shall be galvanized steel or a corrosion resistant metal
that is at least 0.0276 inch (0.7 mm) thick.
2. The
pan shall be at least 11/2 inches (38
mm) deep and sized to receive all dripping and condensate from
the water heater.
3. The
drain line on the pan shall be 1 inch (25 mm) or the outlet
diameter of the relief valve.
____ Terminate
the water heater pan drain to an indirect waste receptor, floor
drain or to the outside of the building between 6 and 24 inches
(152 and 610 mm) from the adjacent ground surface. (Section 1004.3.2)
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M. Fuel-gas Piping
top
____ Provide
distance from gas meter to outlets with Btu rating of each outlet
and all gas pipe sizes. (Section 1318)
____ What
type of material will be used for gas piping?
____ Show
the location of all the building shut-off valves in the gas piping
system. (Section 1312.10)
____ Show
the location of the pressure regulators in the medium- or high-pressure
gas piping system. (Section 1319.3)
____ Show
the vents to the outside of the building on the gas regulators.
(Section 1319.3)
N. Miscellaneous
top
____ A
residential open-top broiler unit should be provided with a hood
and an exhaust fan having a minimum capacity of 100 cubic feet per
minute per square foot [508 L/(s•m2)] of hood intake
area as required by Section 918.
____ Domestic
Clothes Dryer:
- Moisture-exhaust
duct should be provided. Size of duct should be 4 inches (102
mm) with a maximum run of 14 feet (4267 mm), including two 90-degree
elbows. (Section 504.3.2.2)
-
When a clothes dryer is installed in a closet, a minimum opening
of 100 square inches for makeup air shall be provided. (Section
504.3.2)
____ If
gas logs are to be installed in a solid-fuel-burning fireplace,
the fireplace should have its flue damper blocked open to prevent
spillage of combustion products into the room, with a minimum of
1 square inch per 2,000 Btu/h (1.09 mm2/W) input of the
gas log. (Section 912.1)
____ Show
bathroom ventilation on plans (either by use of openable windows
or exhaust fans).
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