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Form 43343110
May 2021
-39-
6. A minimum clearance of 6 inches must be maintained betwee n the outside wall and vent cap (18” clearance
will provide stability under high wind conditions).
7. The horizontal venting system shall not terminate:
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Less than 4 ft. (1.2m) below, 4 ft. (1.2m) horizontally from or 1 ft. (30cm) above any door, operable
window or gravity air inlet into any building. The bottom of the vent terminal shall be located at least 7 ft.
(2.1m) above grade or above snow accumulation level as determined by local codes.
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Less than 3 ft. (0.9m) from a combustion air inlet.
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Less than 3 ft. (0.9m) from any other building opening or any gas service regulator.
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Less than 7 ft. (2.1m) above public walkways.
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Directly over areas where condensate or vapor could create a nuisance or hazard or be harmful to the
operation of gas utility meters, regulators, relief valves, or other equipment. Building materials should be
protected from flue gases and condensate.
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Less than 18” ( 0.45m) when directly below a combustible overhang.
8. In regions of the country where prevailing winds are consistently higher than 40 mph, it may be necessary to
terminate the vent system above the roof level.
B. INDIRECT VENTING (UNVENTED HEATERS) — This heater requires ventilation in the building to dilute the
products of combustion and provide fresh air for efficient combustion. Where unvented heaters are used,
gravity or mechanical means shall be provided to supply and exhaust at least 4 CFM per 1,000 Btu/hr input
of installed heaters. Exhaust vents must be located at the highest point above and in the vicinity of the
heaters, and the inlet vents must be located below the level of the heaters. An exhaust hood (Part
#42924100) must be placed on the end of the last body section when used unvented and must be mounted
only in a downward position as shown.