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Re: Combustion Air Source
Are they using the platform as a return air plenum for the furnace? If so, you can't punch a hole in it since it will be sucking air out of the furnace closet rather than supplying combustion air, a big no - no.
Without doing the complete math, they are close to the required inches before "derating" to allow for the grill on the platform floor.
I will bet that they are short after allowing that grill reduction.
Last edited by Jim Luttrall : 03-17-2008 at 10:42 PM.
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