Mike Lamb Posted January 21, 2015 Report Share Posted January 21, 2015 A fresh air duct to the house furnace return duct needs a damper. Right? Quote Link to comment Share on other sites More sharing options...
SNations Posted January 21, 2015 Report Share 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. Quote Link to comment Share on other sites More sharing options...
Mike Lamb Posted January 21, 2015 Author Report Share Posted January 21, 2015 Thanks. Quote Link to comment Share on other sites More sharing options...
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