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Horizontal vent through the sidewall (Category III):
All vent must be installed in accordance with local codes or, in the absence of local codes, with the
National Fuel Gas Code in the USA, ANSI Z223.1/NFPA 54; or the Natural Gas and Propane Instal-
lation Code CSA B149.1 in Canada.
When installed with a horizontal vent through a sidewall, this heater is a Category III appliance, and
the vent system must be approved for Category III application in accordance with UL-1738 or ULC-
S636. Do not use PVC or plastic vent pipe.
Use either a certified Category III venting system, or single wall vent pipe with all of the joints
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and seams sealed with a heat-resistant pliable sealant.
The vent system must be installed in accordance with these instructions, and the instructions
◼
of the vent manufacturer.
A single wall vent system may use a single continuous 36 inch section of double wall vent pipe
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to pass through an exterior wall:
• Single wall galvanized vent pipe (C-Vent): Minimum 26 ga.
• Single Wall to Double Wall Adapter: Duravent 4PVP-AD Adapter or equivalent.
• 36 Inch Double wall vent through outside wall: Duravent PelletVent Pro (PVP) or equivalent:
Single-wall vent: Seal all joints and seams in the pipe, and the adapter with high temperature
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Red RTV sealant for temperatures up to 600°F [315°C]. The sealant must remain pliable when
in use. Follow the instructions of the vent manufacturer for sealing vent pipe connections.
All vent sections and vent connector must be secured using quantity 3 x #8 x 1/2" sheet metal
◼
screws. Seal penetrations and connections with high temperature RTV silicone sealant.
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.
Horizontally vented Category III heaters must be individually vented and cannot use a common
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vent.
Use approved 4" [102 mm] (JA-0528-XX) horizontal wall vent terminal or an approved high-
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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
◼
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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All seams and joints must be checked for gas tightness after installation. With the heater in op-
◼
eration, conduct a leak test on all vent connections, joints, and seams using a soap solution.
A horizontal flue vent will not terminate less than 1 ft [30 cm] above grade level, unless its lo-
◼
cation is adjacent to a public walkway, then it must not terminate less than 7 ft [2.1m] above
the walkway.
Clearance above vent terminal under a combustible overhang or soffit:
◼
• As indicated in FIG. 6 for approved terminations: 4" [100 mm] JA-0528-XX.
• 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.
All vent pipe, adapters, thimbles, supplied locally by others.
◼
Specific requirements for horizontal vent in the USA and Canada are on the next page.
33
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
IM170629
RL: 03C
RD: APR 2019
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