Page 574 - 2018_IRC

FUEL GAS

a masonry, metal or factory-built chimney shall not be G2408.2.1 (305.3.1) Installation in residential garages.
used to supply combustion air. In residential garages where appliances are installed in a
separate, enclosed space having access only from outside
Exception: Direct-v gas-fi appliances of the garage, such appliances shall be permitted to be
designed for installation in a solid fuel-burning fire- installed at floor level, provided that the required combus-
place where installed in accordance with the manu- tion air is taken from the exterior of the garage.
facturer’s instructions.
G2408.3 (305.5) Private garages. Appliances located in pri-
8. Combustion air intake openings located on the exterior vate garages shall be installed with a minimum clearance of 6
of a building shall have the lowest side of such open- feet (1829 mm) above the floor.
ings located not less than 12 inches (305 mm) vertically
from the adjoining finished ground level. Exception: The requirements of this section shall not
apply where the appliances are protected from motor vehi-
G2407.12 (304.12) Protection from fumes and gases. cle impact and installed in accordance with Section
Where corrosive or flammable process fumes or gases, other G2408.2.
than products of combustion, are present, means for the dis-
posal of such fumes or gases shall be provided. Such fumes or G2408.4 (305.7) Clearances from grade. Equipment and
gases include carbon monoxide, hydrogen sulfide, ammonia, appliances installed at grade level shall be supported on a
level concrete slab or other approved material extending not
chlorine and halogenated hydrocarbons.
less than 3 inches (76 mm) above adjoining grade or shall be
In barbershops, beauty shops and other facilities where suspended not less than 6 inches (152 mm) above adjoining
chemicals that generate corrosive or flammable products, grade. Such supports shall be installed in accordance with the
such as aerosol sprays, are routinely used, nondirect vent- manufacturer’s instructions.
type appliances shall be located in a mechanical room sepa- G2408.5 (305.8) Clearances to combustible construction.
rated or partitioned off from other areas with provisions for Heat-producing equipment and appliances shall be installed
combustion air and dilution air from the outdoors. Direct- to maintain the required clearances to combustible construc-
vent appliances shall be installed in accordance with the tion as specified in the listing and manufacturer’s instruc-
appliance manufacturer’s instructions. tions. Such clearances shall be reduced only in accordance
with Section G2409. Clearances to combustibles shall
include such considerations as door swing, drawer pull, over-
SECTION G2408 (305) head projections or shelving and window swing. Devices,
INSTALLATION such as door stops or limits and closers, shall not be used to
G2408.1 (305.1) General. Equipment and appliances shall provide the required clearances.
be installed as required by the terms of their approval, in G2408.6 (305.12) Avoid strain on gas piping. Appliances
accordance with the conditions of listing, the manufacturer’s shall be supported and connected to the piping so as not to
instructions and this code. Manufacturer’s installation exert undue strain on the connections.
instructions shall be available on the job site at the time of
inspection. Where a code provision is less restrictive than the
conditions of the listing of the equipment or appliance or the SECTION G2409 (308)
manufacturer’s installation instructions, the conditions of the CLEARANCE REDUCTION
listing and the manufacturer’s installation instructions shall G2409.1 (308.1) Scope. This section shall govern the reduc-
apply. tion in required clearances to combustible materials, includ-
Unlisted appliances approved in accordance with Section ing gypsum board, and combustible assemblies for chimneys,
G2404.3 shall be limited to uses recommended by the manu- vents, appliances, devices and equipment. Clearance require-
facturer and shall be installed in accordance with the manu- ments for air-conditioning equipment and central heating
facturer’s instructions, the provisions of this code and the boilers and furnaces shall comply with Sections G2409.3 and
requirements determined by the code official. G2409.4.
G2409.2 (308.2) Reduction table. The allowable clearance
G2408.2 (305.3) Elevation of ignition source. Equipment reduction shall be based on one of the methods specified in
and appliances having an ignition source shall be elevated
such that the source of ignition is not less than 18 inches (457 Table G2409.2 or shall utilize a reduced clearance protective
mm) above the floor in hazardous locations and public assembly listed and labeled in accordance with UL 1618.
garages, private garages, repair garages, motor fuel-dispens- Where required clearances are not listed in Table G2409.2, the
ing facilities and parking garages. For the purpose of this sec- reduced clearances shall be determined by linear interpolation
tion, rooms or spaces that are not part of the living space of a between the distances listed in the table. Reduced clearances
dwelling unit and that communicate directly with a private shall not be derived by extrapolation below the range of the
garage through openings shall be considered to be part of the table. The reduction of the required clearances to combusti-
private garage. bles for listed and labeled appliances and equipment shall be
in accordance with the requirements of this section, except that
Exception: Elevation of the ignition source is not required such clearances shall not be reduced where reduction is spe-
for appliances that are listed as flammable-vapor-ignition cifically prohibited by the terms of the appliance or equipment
resistant. listing [see Figures G2409.2(1) through 2409.2(3)].

2018 INTERNATIONAL RESIDENTIAL CODE ® 549
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