3 General venting
Figure
VENT
AIR
6” COUPLING (FIELD SUPPLIED) 
6” CPVC
STARTER
PIECE
(FACTORY SUPPLIED)
THE 6” STAINLESS STEEL ADAPTER SUPPLIED
WITH THE BOILER MUST BE USED FOR VENT
CONNECTION TO PVC/CPVC. THE 6” CPVC
STARTER PIECE MUST BE USED FOR PVC ONLY.
Air inlet pipe materials:
The air inlet pipe(s) must be sealed. Choose acceptable combustion air inlet pipe materials from the following list:
PVC, CPVC or ABS
Dryer Vent or Sealed Flexible Duct (not recommended for rooftop air inlet)
Galvanized steel vent pipe with joints and seams sealed as specified in this section.
Type “B”
Installation & Operation Manual
c.Secure all joints with a minimum of three sheet metal screws or pop rivets. Apply Aluminum Foil Duct Tape or silicone sealant to all screws or rivets installed in the vent pipe.
d.Ensure that the air inlet pipes are properly supported.
The PVC, CPVC, or ABS air inlet pipe should be cleaned and sealed with the pipe manufacturer’s recommended solvents and standard commercial pipe cement for the material used. The PVC, CPVC, ABS, Dryer Vent or Flex Duct air inlet pipe should use a silicone sealant to ensure a proper seal at the appliance connection and the air inlet cap connection. Dryer vent or flex duct should use a screw type clamp to seal the vent to the appliance air inlet and the air inlet cap. Proper sealing of the air inlet pipe ensures that combustion air will be free of contaminants and supplied in proper volume.
When a sidewall or vertical rooftop combustion air supply system is disconnected for any reason, the air inlet pipe must be resealed to ensure that combustion air will be free of contaminants and supplied in proper volume.
DANGER | Failure to properly seal all joints and seams | |
as required in the air inlet piping may result | ||
| ||
| in flue gas recirculation, spillage of flue | |
| products and carbon monoxide emissions | |
| causing severe personal injury or death. |
Stainless steel vent
This product has been approved for use with stainless steel using the manufacturers listed in Table 3A.
*Plastic pipe may require an adapter (not provided) to transition between the air inlet connection on the appliance and the plastic air inlet pipe.
WARNING
Use only the materials, vent systems, and terminations listed in Table 3B. DO NOT mix vent systems of different types
WARNING
Using vent or air intake materials other than those specified, failure to properly seal all seams and joints or failure to follow vent pipe manufacturer’s instructions can result in personal injury, death or property damage. Mixing of venting materials will void the warranty and certification of the appliance.
or manufacturers, unless listed in this manual. Failure to comply could result in severe personal injury, death, or substantial property damage.
NOTICE | Installations must comply with applicable | |||
national, state, and local codes. Stainless | ||||
| steel vent systems | must | be | listed as a |
| system | for | the United | |
NOTICE | The use of |
material for the combustion air inlet pipe is | |
| recommended in cold climates to prevent |
| the condensation of airborne moisture in |
| the incoming combustion air. |
Sealing of Type “B”
a.Seal all joints and seams of the air inlet pipe using either Aluminum Foil Duct Tape meeting UL Standard 723 or
b.Do not install seams of vent pipe on the bottom of horizontal runs.
| States and a | |
| Canada. | |
| Installation of a stainless steel vent system | |
NOTICE | ||
should adhere to the stainless steel vent | ||
| manufacturer’s installation instructions | |
| supplied with the vent system. | |
| The installer must use a specific vent starter | |
NOTICE | ||
adapter at the flue collar connection, | ||
| supplied by the vent manufacturer to adapt | |
| to its vent system. See Table 3B for approved | |
| vent adapters. Discard CPVC starter piece. |
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