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Posted by rbeck on September 24, 2009 at 22:46:52:
In Reply to: Re: Boiler Vent Connection Diameter posted by cydown on September 24, 2009 at 06:38:52:
NFPA 54 code states the vent pipe can only be replaced at the chimney base. You must run the pipe full size to the chimney base and install the reducer there. Any pipe under 12" may be reduced up to 2 pipe sizes providing the draft is proper.
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