Page 616 - 2018_IRC

FUEL GAS

ROOF SLOPE H (minimum) ft
Flat to / 1.0
6
12
7
6
Over / to / 1.25
12 12
Over / to / 1.5
8
7
12 12
Over / to / 2.0
9
8
12 12
9
Over / to / 2.5
10
12 12
11
10
Over / to / 3.25
12 12
Over / to / 4.0
12
11
12 12
12
Over / to / 5.0
14
12 12
14
16
Over / to / 6.0
12 12
18
16
Over / to / 7.0
12 12
Over / to / 7.5
20
18
12 12
21
20
Over / to / 8.0
12 12
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
FIGURE G2427.6.4 (503.6.5)
TERMINATION LOCATIONS FOR GAS VENTS WITH
LISTED CAPS 12 INCHES OR LESS IN SIZE NOT LESS THAN 8 FEET FROM A VERTICAL WALL
G2427.6.5 (503.6.6) Minimum height. A Type B or L gas G2427.6.9 (503.6.10) Size of gas vents. Venting systems
vent shall terminate not less than 5 feet (1524 mm) in ver- shall be sized and constructed in accordance with Sections
tical height above the highest connected appliance draft G2427.6.9.1 through G2427.6.9.4 and the appliance man-
hood or flue collar. A Type B-W gas vent shall terminate ufacturer’s installation instructions.
not less than 12 feet (3658 mm) in vertical height above G2427.6.9.1 (503.6.10.1) Category I appliances. The
the bottom of the wall furnace. sizing of natural draft venting systems serving one or
G2427.6.6 (503.6.7) Roof terminations. Gas vents shall more listed appliances equipped with a draft hood or
extend through the roof flashing, roof jack or roof thimble appliances listed for use with Type B gas vent,
and terminate with a listed cap or listed roof assembly. installed in a single story of a building, shall be in
G2427.6.7 (503.6.8) Forced air inlets. Gas vents shall accordance with one of the following methods:
terminate not less than 3 feet (914 mm) above any forced 1. The provisions of Section G2428.
air inlet located within 10 feet (3048 mm). 2. For sizing an individual gas vent for a single,
G2427.6.8 (503.6.9) Exterior wall penetrations. A gas draft-hood-equipped appliance, the effective area
vent extending through an exterior wall shall not terminate of the vent connector and the gas vent shall be
adjacent to the wall or below eaves or parapets, except as not less than the area of the appliance draft hood
provided in Sections G2427.2.1 and G2427.3.3. outlet, nor greater than seven times the draft hood
outlet area.
2018 INTERNATIONAL RESIDENTIAL CODE ® 591
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.