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3.0
Installation
•
Venting
Sidewall Venting
Guidelines:
Vent Pipe Angle
• To prevent moisture from entering the heater system, slope the vent pipe downward toward the
outlet 1/4 in. per foot of length. Do not pitch the heater.
• **Vent must extend beyond any combustible overhang if the vent is less than 36 in. below the
combustible overhang.
Figure 3.11
•
Sidewall Venting Requirements
Vent Termination
United States:
• Vent must terminate a minimum of 4 ft. (1.2 m) below, 4 ft. (1.2 m) horizontally from, and 1 ft.
(30 cm) above any window or door that may be opened or gravity air inlet into the building.
• Vent must terminate a minimum of 3 ft. (.9 m) above any forced air inlet that is located within
10 ft. (3.1 m).
• The bottom of the vent terminal must be located a minimum of 12 in. (30 cm) above grade level
and must extend beyond any combustible overhang. Vents adjacent to public walkways must
terminate a minimum of 7 ft. (2.1 m) above grade level.
• The vent terminal must be installed to prevent blockage by snow and protect building materials
from degradation by flue gases.
• The vent cap must be a minimum of 6 in. (15.2 cm) from the sidewall of the building.
• Vent must be a minimum of 36 in. below or extend beyond any combustible overhang.
Canada:
• Vents must terminate a minimum of 3 ft. (.9 m) from a window or door that may be opened, and
non-mechanical air supply inlet or combustion air inlet into the building.
• Vents must terminate a minimum of 6 ft. (1.8 m) from a mechanical air supply inlet.
•
Sidewall Venting
Sidewall
Heater
B to C Adapter
Single
Wall Vent
1/4 in. downward
pitch per foot
6 in.
min.**
Double-Wall
B-Vent
20
AVS
Series
Building Overhang**
36 in.
min.**
Sidewall Vent Cap
Wall Thimble
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