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All installations and services must be performed by qualified service personnel.
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: Bushes, shrubs, or any vegetation that may restrict the flow of flue products must be kept
away from vent and air intake terminations. Terminations must also be kept clear of any leaves, weeds,
combustible materials, snow, and ice build-up. Avoid locating the vent terminal over areas where
dripping of condensate, or small pools of acidic condensate, could create a problem.
In addition to following any local code requirements, when possible, utilize the guidelines below in locating
the vent terminal to help insure trouble-free operation of a sidewall vented furnace:
• Avoid locating the vent terminal on a wall facing prevailing winds and wide-open areas. When
impractical, choose a location that protects the vent from strong winds, such as behind a fence or
hedge.
• In geographical areas with considerable snowfall, it is advisable to locate the vent terminal much higher
than the minimum 12-inches above ground to prevent blockage by snow accumulation or drifting.
• The vent and combustion air terminations shall be checked periodically, at least at the start of each
heating season, for restriction or blockage from foreign material in the exhaust vent or in the air intake
piping. Clean the air intake and vent terminations when necessary.
E1. Single-Pipe (Sidewall) Venting Option
NOTICE: When possible, we recommend all furnace of the model series CHB1 / CDB1 be installed to
utilize outside combustion air. The use of outside combustion air usually results in the most energy
efficient, nuisance free, and long-lived operation of the furnace.
NOTICE: Heat exchanger failure accelerated by contaminated combustion air will void the furnace heat
exchanger limited lifetime warranty.
This furnace may be horizontally, i.e. sidewall, vented using an exhaust vent pipe alone without drawing in
outside combustion air. When single-pipe, sidewall venting a furnace, combustion air is drawn from the indoor
space. This type of installation is not classified as a direct vent installation. However, the same exhaust venting
guidelines apply as for a direct vent installation, except the exhaust termination will be similar to the air intake
of the "two- pipe", direct vent installation. Refer to depictions of proper intake terminal installations in Figures 2
and 3. Referring to the left-hand (LH) sketch in Figure 2, vent termination will consist of one (1), 90° elbow,
opening downward.
When indoor air is used for combustion, measures should be taken to prevent drawing in corrosive chemicals
vapors or gases with the combustion air supply. Such chemicals include, but are not limited to, chlorinated
and/or fluorinated hydrocarbons such as found in refrigerants, aerosol propellants, dry cleaning fluids,
degreasers and removers. Other harmful compounds may come from bleaches, air fresheners or mastics. Vapors
from such products can form reactive acid producing chemical species when burned in a gas flame. The life of
the furnace could be reduced should acidic compounds form within the furnace.
F. Installation Of Outside Exhaust / Intake Terminations
1. After determining appropriate installation locations (suitable locations must observe all clearances specified
in this manual), mark and cut two (2) holes in the outside wall of the following sizes for the outdoor
terminal(s),
• 2-3/8 inch diameter, for furnace models CHB1 / CDB1-50 and CHB1 / CDB1-75, or
• 3-1/2 inch diameter, for the furnace models CHB1 / CDB1-100 and CHB1 / CDB1-125.