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thanks binford,

I misunderstood "supply" air for combustion air.

sorry for the triple post. That's what I get for using my cell phone to check this website.

Thanks for everyones advice, lots a work todo.

thank you.

under duct systems in the 2003 Interntional Residential Building Code it says it is ok to use floor joists for supply inside of conditioned spaces.

Does the National code not allow...

thank you.

under duct systems in the 2003 Interntional Residential Building Code it says it is ok to use floor joists for supply inside of conditioned spaces.

Does the National code not allow...

thank you.

under duct systems in the 2003 Interntional Residential Building Code it says it is ok to use floor joists for supply inside of conditioned spaces.

Does the National code not allow...