Page 576 - 2018_IRC

FUEL GAS

COMBUSTIBLE
WALL
1 INCH MINIMUM
AIRSPACE
BETWEEN
MASONRY AND
COMBUSTIBLE
WALL
4-INCH
NOMINAL
BRICK WALL
CORRUGATED
METAL WALL
TIES
BOTTOM AND TOP
COURSE OF BRICKS
STAGGERED FOR
VENTILATION
A STRIP OF HEAVY-
GAUGE STEEL USED
FOR ADDED SUPPORT
NOTE: DO NOT PLACE
MASONRY WALL TIES
DIRECTLY BEHIND
APPLIANCE OR
CONNECTOR

MASONRY WALL TIE

For SI: 1 inch = 25.4 mm.
FIGURE G2409.2(3) [308.2(3)]
MASONRY CLEARANCE REDUCTION SYSTEM
G2409.3.4 (308.3.4) Clearance from supply ducts. Sup- combustible material attached to combustible material, the
ply air ducts connecting to listed central heating furnaces clearance shall be measured to the surface of the plaster or
shall have the same minimum clearance to combustibles as other noncombustible finish where the clearance specified
required for the furnace supply plenum for a distance of not is 2 inches (51 mm) or less.
less than 3 feet (914 mm) from the supply plenum. Clear- G2409.4.4 (308.4.5) Clearance from supply ducts. Sup-
ance is not required beyond the 3-foot (914 mm) distance. ply air ducts connecting to listed central heating furnaces
G2409.4 (308.4) Central-heating boilers and furnaces. shall have the same minimum clearance to combustibles as
Clearance requirements for central-heating boilers and fur- required for the furnace supply plenum for a distance of
naces shall comply with Sections G2409.4.1 through not less than 3 feet (914 mm) from the supply plenum.
G2409.4.5. The clearance to these appliances shall not inter- Clearance is not required beyond the 3-foot (914 mm) dis-
fere with combustion air; draft hood clearance and relief; and tance.
accessibility for servicing. G2409.4.5 (308.4.3) Clearance for servicing appliances.
G2409.4.1 (308.4.1) Appliances clearances. Central- Front clearance shall be sufficient for servicing the burner
heating furnaces and low-pressure boilers shall be and the furnace or boiler.
installed with clearances in accordance with the manufac-
turer’s instructions.
G2409.4.2 (308.4.2) Clearance reduction. Central-heating SECTION G2410 (309)
furnaces and low-pressure boilers shall be permitted to be ELECTRICAL
installed with reduced clearances to combustible material G2410.1 (309.1) Grounding. Gas piping shall not be used as
provided that the combustible material or appliance is pro- a grounding electrode.
tected as described in Table G2409.2 and such reduction is G2410.2 (309.2) Connections. Electrical connections
allowed by the manufacturer’s instructions. between appliances and the building wiring, including the

G2409.4.3 (308.4.4) Plenum clearances. Where the fur- grounding of the appliances, shall conform to Chapters 34
nace plenum is adjacent to plaster on metal lath or non- through 43.

2018 INTERNATIONAL RESIDENTIAL CODE ® 551
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.