Appendix B - Vent Terminations - American Standard GRWF130A94A0A Installation Manual

6.2 Appendix B - Vent Terminations

THROUGH THE WALL VENT TERMINATIONS (excerp-
ted from NFPA - National Fuel Gas Code - See illustration
below) See Appendix C
A mechanical draft venting system shall terminate at least
3 ft (0.9 m) above any forced air inlet located within 10 ft
(3.0 m).
Exception No. 1: This provision shall not apply to the com-
bustion air intake of a direct-vent appliance.
Exception No. 2: This provision shall not apply to the
separation of the integral outdoor air inlet and fl ue gas
discharge of listed outdoor appliances.
A mechanical draft venting system of other than direct-vent
type shall terminate at least 4 ft (1.2 m) below, 4 ft (1.2 m)
horizontally from, or 1 ft (300 mm) above any door, operable
window, or gravity air inlet into any building. The bottom of
the vent terminal shall be located at least 12 in. (300 mm)
above grade.
The vent terminal of a direct-vent appliance with an input
of 10,000 Btu/hr (3 kW) or less shall be located at least 6
in. (150 mm) from any air opening into a building and such
an appliance with an input over 10,000 Btu/br (3 kW) but
not over 50,000 Btu/hr (14.7 kW) shall be installed with a 9
in. (230 mm) vent termination clearance, and an appliance
with an input over 50,000 Btu/hr (14.7 kW) shall be at least
a 12 in. (300 mm) vent termination clearance. The bottom
of the vent terminal and the air intake shall be located at
least 12 in. (300 mm) above grade.
Through-the-wall vents for Category II and Category IV
appliances and noncategorized condensing appliances shall
not terminate over public walkways or over an area where
condensate or vapor could create a nuisance or hazard or
could be detrimental to the operation of regulators, relief
valves, or other equipment. Where local experience indi-
cates that condensate is a problem with Category I and
Category III appliances, this provision shall also apply.
18-CG02D1-4
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