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USA specific horizontal vent requirements:
The vent terminal of an appliance with an input up to 50,000 Btu/hr (14.7kW) shall be installed
◼
with a 9 inch [230mm] vent termination clearance from any air opening into a building, and an
appliance with an input over 50,000 Btu/hr (14.7kW) shall have at least a 12 inch [305 mm]
vent termination clearance. The bottom of the vent terminal and the air intake shall be located
at least 12 inches [305 mm] above grade.
A horizontal vent will not terminate:
◼
•
Less than 3 ft [915 mm] above a mechanical air inlet located within 10 ft [3 m]
•
Less than 4 ft [1219 mm] below, 4 ft [1219 mm] horizontally from, and 1 ft [102 mm]
above any window or door that opens, or gravity air inlet to a building
•
Less than 4 ft [1219 mm] horizontal clearance from gas and electric meters, regulators
and relief equipment
FIGURE 8: HORIZONTAL VENT THROUGH WALL
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902000002
902000007
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HE+ Series Modulating Supplemental Manual
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