Thermo Pride Gas/Propane Furnace Concentric Vent (CMA) - Manual (Page 12)

ALL INSTALLATIONS AND SERVICE MUST BE PERFORMED BY QUALIFIED SERVICE PERSONNEL.
INSTALLING TWIN 2” DIAMETER PVC PIPES THRU THE ROOF WITH 2” HOLE
FLASHING PLATES.
1. Required kit: AOPS7484
2. Type installation: Thru the roof
3. The inlet of the combustion air intake shall be a minimum of 12” above highest
anticipated snow level, see FIG-12.
4. The exhaust vent outlet must be installed a minimum of 12” above the air intake
inlet, see FIG-12.
5. Where exposed to prevailing winds, the combustion air intake shall be installed
upwind of the vent outlet, see FIG-12.
6. The 2” flashing plates are to be used to cover both the opening in roof and ceiling.
7. Remove existing roof jack to run the 2” PVC pipes thru the roof or a hole of
diameter needs to be cut in roof and ceiling to run the PVC pipes.
8. Affix one of the flashing plates to the roof covering the existing opening or the newly
cut opening. Plate should be secured with roofing fasteners and an appropriate type
of roof caulk or sealant to ensure no leakage after installation.
9. Drop the field supplied 2” PVC pipes thru the flashing holes. Seal with RTV type
sealant and clamp securely with factory supplied clamps, see FIG-12.
10. Place ceiling flashing plate over the ceiling opening and the two 2” PVC pipes.
Secure with screws or an appropriate fastener, clamp securely with factory supplied
clamps, see FIG-12.
11. Using field supplied PVC pipe and elbows connect the 2” PVC vent pipe to the
exhaust vent pipe on the furnace and the 2” PVC air intake pipe to the combustion
air intake pipe on the furnace. PVC cement all joints except for the final connection
to the furnace. Use radiator hose fittings and clamps included with furnace to make
final connection, see FIG-12.
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