9.2 General Venting Requirements Model
WARNING
Carbon Monoxide Hazard
Heaters installed unvented must be interlocked with sufficient building exhaust.
Heaters must be installed according to the installation manual.
Failure to follow these instructions can result in death or injury.
This heater must be vented in accordance with the rules contained in this manual and with the following national codes and any state, provincial or local codes which may apply: United States: Refer to ANSI Z223.1 (NFPA 54) - latest revision; Canada: Refer to
Any portion of vent pipe passing through a combustible wall must have an approved thimble to conform with the above listed codes.
Vent pipe must be sloped downward away from the pump ¼'' every 10' (3 m).
The bottom of the vent or air intake terminal shall not be located less than 1' (.3 m) above grade level.
The vent shall not terminate less than 7' (2.1 m) above grade where located adjacent to public walkways.
Vent terminal must be installed at a height sufficient to prevent blockage by snow, and building materials protected from degradation by flue gases.
Secure all joints with #8 x 3/8 sheet metal screws.
Seal all joints with high temperature silicone sealant.
Vent terminal must be beyond any combustible overhang.
9.2.1 Vertical Venting
See Page 33, Figure 15 for recommended vertical venting options.
9.2.2 Horizontal Venting
See Page 34, Figure 16 through Page 36, Figure 18 for recommended horizontal venting options.
9.2.3 United States Requirements
Vent must terminate at least 3' (.9 m) above any forced air inlet located within 10' (3.1 m).
Vent must terminate at least 4' (1.2 m) below,
4' (1.2 m) horizontally from, or 1' (.3 m) above any door, operable window, or gravity air inlet into any building.
9.2.4 Canadian Requirements
The vent shall not terminate within 6' (1.8 m) of a mechanical air supply inlet to any building.
The vent shall not terminate within 3' (.9 m) of a window or door that can be opened in any building, any
Length Requirements
See Page 33, Figure 15 through Page 36, Figure 18 for recommended vent lengths and sizes.
Seal all pipe joints with high temperature silicone sealant in the vent pipe. Insulation and additional sealing measures will be required.
Optional heat exchanger lengths are considered as vent length for length determination.
Subtract 15' (4 m) of maximum allowed vent or outside air duct length per vent elbow if more than three are used.
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