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post #7 of (permalink) Old 2012-04-16, 06:45 PM
Join Date: Oct 2008
Location: Canada
Posts: 1,938
If you have a natural draft water heater or furnace, pulling out 680 cfm may cause carbon monoxide poisoning.

For that amount of air, a 8-10"+ pipe may be required; chances are that there isn't enough clearance for that. Most install manuals spec out the pipe size required and the maximum equivalent length.

WARNING: The HVAC information I provide is not based on field experience and DOES NOT constitute professional advice.
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