Worried about air sealing fireplace attic vent cavity

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Worried about air sealing fireplace attic vent cavity

I'm an insulation contractor and I also try to close up the "big" air sealing holes before we blow in additional loosefill insulation. I want to close off the enormous cavity the builder left for the fireplace vent stack. My concern is how does a fireplace draw fresh air from combustion? Do I need to leave this cavity open to prevent back drafting?
Thank you for your responses.

http://www.atticadventures.com/wp-content/uploads/2012/12/Fireplace-Vent...

http://www.atticadventures.com/wp-content/uploads/2012/12/Fireplace-Vent...

Asked by Randy Ransom
Posted Mon, 12/03/2012 - 21:10
Edited Tue, 12/04/2012 - 09:13

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