46
LP-185 Rev. 9.9.14
Figure 24
H. EXHAUST VENT AND INTAKE PIPE INSTALLATION
1. Use only solid PVC or CPVC pipe, AL29-4C Stainless Steel, or a Polypropylene vent system approved for use with Category IV
appliances. FOAM CORE PIPING IS NOT APPROVED.
All joints of positive pressure vent systems must be sealed completely to prevent leakage of flue products into living space.
2. Remove all burrs and debris from joints and fittings.
3. When using PVC or CPVC pipe, all joints must be properly cleaned, primed, and cemented. Use only cement and primer approved
for use with the pipe material. Cement must conform to ASTM D2564 for PVC and ASTM F493 for CPVC pipe.
NOTE: DO NOT
CEMENT POLYPROPYLENE PIPE.
4. Ensure the vent is located where it will not be exposed to prevailing winds.
5. In all roof venting applications, exhaust discharge must point away from the pitch of the roof.
6. To prevent water leakage, install adequate roof flashing where the pipe enters the roof.
7. Do not locate vent over public walkways, driveways, or parking lots. Condensate could drip and freeze, resulting in a slip hazard or
damage to vehicles and machinery.
8. Due to potential moisture build-up, sidewall venting may not be the preferred venting option. To save time and cost, carefully
consider venting installation and location.
9. Horizontal lengths of exhaust vent must slope back towards the boiler not less than ¼" per foot to allow condensate to drain from the
vent pipe.
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