Chapter 3 — Stack and Intake Vent Sizing and Installation
Part No. 750-263 3-11
These installations utilize the boiler-mounted blower to draw
combustion air from outside and vent combustion products to the
outside.
UL 17-38 Certified Venting Material (e.g. AL29-4C) MUST be used.
The vent must be installed to prevent flue gas leakage. Care must
be taken during assembly to insure that all joints are sealed properly
and are airtight.
For certain installations PVC or CPVC may be used. Contact the
authorized Cleaver-Brooks representative for details.
To prevent condensation accumulation in the vent, it is required to
install the horizontal portion of vent with a slight upward slope of
not more than 1/4" per foot of horizontal run and an approved
condensate trap must be installed per applicable codes.
No substitutions of flue pipe or vent cap material are allowed. Such
substitutions would jeopardize the safety and health of inhabitants.
The stainless steel non-restricted direct vent cap must be furnished
in accordance with AGA/CSA requirements.
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