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Horizontal vent through the sidewall (Category III):
When installed with a horizontal vent through a sidewall, this heater is a Category III appliance,
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and venting materials must be approved for Category III applications.
All vent must be installed in accordance with local codes or, in the absence of local codes, with
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the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
All vent must installed in accordance with these instructions, and the instructions of the vent
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manufacturer.
Do not mix vent components from different manufacturers in the vent system
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A single wall vent system may use a single continuous section of double wall vent pipe to pass
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through an exterior wall.
Any horizontal portion of the flue vent system must slope downwards away from the heater a
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minimum of 1/4" per foot run [63 mm/ 300 mm] toward the vent terminal.
All vent pipe from a single heater must be 4" [102 mm] diameter; common vent pipe for two
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heaters must increase to 6" [152 mm] at the point of connection of individual 4" vents
Use approved 4" [102 mm] (902000002) or 6" [152 mm] (902000007) horizontal wall vent ter-
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minal or an approved high-wind termination cap
Installation of the vent must prevent blockage by snow and protect building materials from deg-
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radation by flue gases.
Install termination cap a minimum of 18 inches (45 cm) from the outside wall to the inside edge
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of terminal opening to alleviate back pressure caused by turbulent wind conditions (See Fig.
8). This also ensures flue gases are directed away from the structure to protect building mate-
rials from degradation by the exhausted flue gases.
At most two 90° elbows can be installed in a horizontal vent
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A horizontal flue vent will not terminate less than 1 ft [30 cm] above grade level, unless its lo-
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cation is adjacent to public walkways, then it must not terminate less than 7 ft [2.1m] above the
walkway.
Clearance below a combustible overhang or soffit:
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• As indicated in FIGURE 8 for approved terminations: 4" [100 mm] 902000002 or 6" [150
mm] 90200000.
• For other approved terminations: Will terminate 3 ft [915 mm] or more below a combustible
soffit or overhang.
A horizontal vent termination must be a minimum of 6 feet [1830 mm] from an inside corner
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formed by two exterior walls.
A venting system shall be securely supported by noncombustible hangers suitable for the
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weight of the materials.
A slip joint in the horizontal section of a venting system shall be secured with quantity 3 x #8 x
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1/2" sheet metal screws to prevent sagging.
Seal single-wall vent seams and joints with Dow Corning 736 Heat Resistant Sealant 600°F
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[315°C] or equivalent, or follow the instructions of the vent manufacturer for sealing vent pipe
connections
USA specific requirements for horizontal vent are on the next page
HE+ Series Modulating Supplemental Manual
16
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