All installations and services must be performed by qualified service personnel.
NOTICE: The furnace model series CHB1 / CDB1 may be vented either through the sidewall or the roof. For sidewall instructions, continue to the following section. For roof venting, refer to Section III G, of this manual
E. Direct Venting Through a Sidewall
1. Vent and combustion air pipes may pass through a maximum wall thickness of 18 inches. The minimum wall thickness is 2 inches. Referring to Figure 2, the maximum distance from the outer wall to the center of the elbow is 12 inches.
Figure 2: Proper Direct Vent Terminations (RH & LH views) and Vent Termination Only w/o
Outside Combustion Air Intake (RH view)
NOTICE: If exterior sidewall building materials are subject to degradation from contact with flue gases or moisture, a minimum
2.The exhaust vent termination elbow shall be installed in accordance with these instructions and any applicable local codes. Refer to Figures 2 and 3 for typical examples of proper terminations.
a.The exhaust vent termination must be installed in the same atmospheric pressure zone (i.e. on the same wall) as the air intake termination.
b.The bottom edge of the vent termination elbow must be installed at least
c.The horizontal distance between the inlet and exhaust terminations should be minimized, when possible, and should never exceed
d.The vent and intake systems should utilize the same numbers of elbows and approximately the same length of straight pipe to reach the outside termination.
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