Page 611 - 2018_IRC

FUEL GAS

TABLE G2424.1 (415.1) both the connector and the flue. Listed direct connection
SUPPORT OF PIPING devices shall be installed in accordance with their listing.
STEEL PIPE, NOMINAL SIZE
NOMINAL SIZE SPACING OF OF TUBING SPACING OF G2425.8 (501.8) Appliances not required to be vented. The
SUPPORTS
SUPPORTS
OF PIPE (feet) SMOOTH-WALL (feet) following appliances shall not be required to be vented:
(inches) (inch O.D.)
1 / 2 6 1 / 2 4 1. Ranges.
3 / or 1 8 5 / or / 4 6 2. Built-in domestic cooking units listed and marked for
3
4
8
1
1 / or larger 10 7 / or 1 8 optional venting.
4
8
(horizontal) (horizontal) 3. Hot plates and laundry stoves.
1
1 / or larger Every floor 1 or larger Every floor 4. Type 1 clothes dryers (Type 1 clothes dryers shall be
4
(vertical) level (vertical) level exhausted in accordance with the requirements of Sec-
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. tion G2439).
5. Refrigerators.
SECTION G2425 (501) 6. Counter appliances.
GENERAL 7. Room heaters listed for unvented use.
G2425.1 (501.1) Scope. This section shall govern the instal- Where the appliances listed in Items 5 through 7 are
lation, maintenance, repair and approval of factory-built installed so that the aggregate input rating exceeds 20 Btu per
chimneys, chimney liners, vents and connectors and the utili- hour per cubic foot (207 W/m ) of volume of the room or
3
zation of masonry chimneys serving gas-fired appliances. space in which such appliances are installed, one or more
G2425.2 (501.2) General. Every appliance shall discharge shall be provided with venting systems or other approved
the products of combustion to the outdoors, except for appli- means for conveying the vent gases to the outdoor atmo-
ances exempted by Section G2425.8. sphere so that the aggregate input rating of the remaining
unvented appliances does not exceed 20 Btu per hour per
G2425.3 (501.3) Masonry chimneys. Masonry chimneys cubic foot (207 W/m ). Where the room or space in which the
3
shall be constructed in accordance with Section G2427.5 and appliance is installed is directly connected to another room or
Chapter 10. space by a doorway, archway or other opening of comparable
size that cannot be closed, the volume of such adjacent room
G2425.4 (501.4) Minimum size of chimney or vent. Chim-
neys and vents shall be sized in accordance with Sections or space shall be permitted to be included in the calculations.
G2427 and G2428. G2425.9 (501.9) Chimney entrance. Connectors shall con-
G2425.5 (501.5) Abandoned inlet openings. Abandoned nect to a masonry chimney flue at a point not less than 12
inlet openings in chimneys and vents shall be closed by an inches (305 mm) above the lowest portion of the interior of
approved method. the chimney flue.
G2425.10 (501.10) Connections to exhauster. Appliance
G2425.6 (501.6) Positive pressure. Where an appliance
equipped with a mechanical forced draft system creates a connections to a chimney or vent equipped with a power
positive pressure in the venting system, the venting system exhauster shall be made on the inlet side of the exhauster.
shall be designed for positive pressure applications. Joints on the positive pressure side of the exhauster shall be
sealed to prevent flue-gas leakage as specified by the manu-
G2425.7 (501.7) Connection to fireplace. Connection of facturer’s installation instructions for the exhauster.
appliances to chimney flues serving fireplaces shall be in
accordance with Sections G2425.7.1 through G2425.7.3. G2425.11 (501.11) Masonry chimneys. Masonry chimneys
utilized to vent appliances shall be located, constructed and
G2425.7.1 (501.7.1) Closure and access. A noncombusti- sized as specified in the manufacturer’s installation instruc-
ble seal shall be provided below the point of connection to tions for the appliances being vented and Section G2427.
prevent entry of room air into the flue. Means shall be pro-
vided for access to the flue for inspection and cleaning. G2425.12 (501.12) Residential and low-heat appliances
flue lining systems. Flue lining systems for use with residen-
G2425.7.2 (501.7.2) Connection to factory-built fire- tial-type and low-heat appliances shall be limited to the fol-
place flue. An appliance shall not be connected to a flue lowing:
serving a factory-built fireplace unless the appliance is
specifically listed for such installation. The connection 1. Clay flue lining complying with the requirements of
shall be made in accordance with the appliance manufac- ASTM C315 or equivalent. Clay flue lining shall be
turer’s installation instructions. installed in accordance with Chapter 10.
G2425.7.3 (501.7.3) Connection to masonry fireplace 2. Listed chimney lining systems complying with UL
flue. A connector shall extend from the appliance to the 1777.
flue serving a masonry fireplace such that the flue gases 3. Other approved materials that will resist, without
are exhausted directly into the flue. The connector shall be cracking, softening or corrosion, flue gases and con-
accessible or removable for inspection and cleaning of densate at temperatures up to 1,800ºF (982ºC).

586 2018 INTERNATIONAL RESIDENTIAL CODE ®
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