Vent Terminal Location Guidelines; Installation Of Outside Exhaust/Intake Terminations - Thermo Pride CMA4-50D36N Installation And Service Manual

4. Vent Terminal Location Guidelines

: 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.
I. 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), 2-3/8 inch
diameter holes in the outside wall for the outdoor terminal(s)
2. Measure and cut two (2), 2-inch diameter thermoplastic pipes 1-1/2 inches
longer than the depth of the wall. (Cutting the pipe longer leaves a ¾ inch
connection allowance at both ends of the pipe.) Using PVC pipe cement, glue a
PVC elbow or coupling fitting to one (1) end of each pipe.
Before inserting the pipe through the wall, mark the other end of the pipe so the
elbow orientation can be determined. Also, if a protective shield (refer to Section
H., passage 1. of this manual) will be used on the exterior surface of the wall, it
should be installed at this time. From the inside, glue a coupling fitting to each
pipe, using PVC pipe cement, while being careful to maintain the proper
orientation of the termination elbow(s). Complete the assembly of the outlet and
inlet as shown in Figure 10, making sure that the spacing between the inlet and
outlet complies with that noted in Figure 8.
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