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Termination Cap Options:
Use the approved 4" (10 cm) (JA-0528-XX) or 6" (15 cm) (JA-0529-XX) horizontal
wall vent terminal (see FIGURE 20 for applicable clearances)
OR a high-wind termination cap approved by a recognized certification agency (see
clearance notes below)
Install any termination cap a minimum of 18 inches (45 cm) from the outside wall to the in-
side edge of terminal opening to alleviate back pressure caused by turbulent wind condi-
tions (See Fig. 19). This also ensures flue gases are directed away from the structure to
protect building materials from degradation by the exhausted flue gases.
Termination cap must be installed to prevent blockage by snow and protect building materi-
als from degradation by flue gases.
Clearances for horizontal flue vent :
Will not terminate less than 1 ft (30 cm) above grade level, unless its location is adjacent
to public walkways, then it must not terminate less than 7 ft (2.1m) above the walkway.
Below an overhang:
As indicated in FIGURE 20 for approved terminations: 4" (10 cm) JA-0528-XX or
6" (15 cm) JA-0529-XX
For other approved terminations: Will terminate 3 ft (90 cm) or more below a combus-
tible soffit or overhang.
USA specific horizontal vent requirements:
The vent terminal of a direct-vent appliance with an input between 10,000 Btu/hr (3 kW)
and 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 12inch (300mm) vent termination clear-
ance. The bottom of the vent terminal and the air intake shall be located at least
12inches (300mm) above grade.
A horizontal vent will not terminate:
Less than 3 ft (90 cm) above a mechanical air inlet located within 10 ft (3.1 m)
Less than 4 ft (1.2 m) below, 4 ft (1.2 m) horizontally from, and 1 ft (0.3 m) above
any window or door that opens, or gravity air inlet to a building
Less than 4 ft (1.2 m) horizontal clearance from gas and electric meters, regula-
tors and relief equipment
CANADA specific horizontal vent requirements:
A horizontal vent will not terminate:
Within 6 ft (1.8 m) of a mechanical air supply inlet to any building.
Above a gas utility meter and regulator assembly within 3 ft (0.9 m) horizontally of
the vertical centerline of the regulator vent outlet to a maximum vertical distance
of 15 ft (4.5 m).
Within 3 ft (90 cm) of any gas pressure regulator vent outlet
Within the following distances of a window or door that can be opened in any
building, of any non-mechanical air-supply inlet to any building, or of the combus-
tion air inlet of any other appliance:
12 inches (30 cm) for inputs up to and including 100,000 Btuh (30 kW)
3 ft (90 cm) for inputs exceeding 100,000 Btuh (30 kW)
19
P40U-F / P40U-IF I&O Manual
IM101220
RD: MAR 2014
RL: 4B
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