Thread: Combustion Air Source
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Old 03-17-2008, 10:51 PM
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Billy Stephens Billy Stephens is offline
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Re: Combustion Air Source
Quote:
Originally Posted by Jim Luttrall View Post
--allowing that grill reduction.
Metal grill = 75% of area.

4 in dia = 12.5 sq inches

14 x 6 = 84 x 75 % = 63 + 12.5 = 75.5 sq. inches total combustion air.
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