Mike Lamb Posted January 21, 2015 Report Posted January 21, 2015 A fresh air duct to the house furnace return duct needs a damper. Right?
SNations Posted January 21, 2015 Report Posted January 21, 2015 Yes. IRC 2012 section 1103.5 (Also IECC 2012 section 403.5) Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating.
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