All installations and services must be performed by qualified service personnel.
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. (For 3-inch diameter PVC pipe, leave a 3-inch allowance for end connections). 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 E.,
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 5, making sure that the spacing between the inlet and outlet complies with that
noted in Figure 3.
Figure 5: Typical Sidewall Vent and Air Intake Termination Construction Details
3. Finish the vent installation by caulking the annulus to seal around the two (2) holes where the
thermoplastic pipes pass through the wall.
4. To prevent foreign material, insects, or small animals from entering the pipes, an optional vent or
intake terminal (stainless steel) screen is available from Thermo Products, 3”-part no. 320226, 2”-
part# 320219.
5.
Optional Direct Vent Terminations
Three optional vent kits are available for direct vent terminations, refer to Figure 6.
•
The concentric vent kits (Thermo Products p/n AOPS7488 & AOPS7489) provide a means
for the vent and intake to be installed through a single opening in the roof or exterior wall. Kit
p/n AOPS7488 requires a 4” inch diameter hole and is used on furnace models CHX3/CDX3-
75. Kit p/n AOPS7489 requires a 5” inch diameter hole and is used on furnace models
CHX3/CDX3-100 &125.
•
The sidewall vent cap (Thermo Products part no. 370191) is a cover installed over the
exhaust vent and air intake pipes on the exterior of the building. For horizontal sidewall vent
applications only. This kit may be used on any size furnace in the CHX3/CDX3 family.
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