Robert Jones Posted March 2, 2013 Report Share Posted March 2, 2013 New construction. Flex duct is being used for the over the range microwave ventilation. Is there a flex duct product that is considered air tight, single walled? Click to Enlarge 69.02 KB Quote Link to comment Share on other sites More sharing options...
ericwlewis Posted March 2, 2013 Report Share Posted March 2, 2013 I don't know about all that but the top of every micro/hood I've installed has had a damper on it. I've always used rigid duct for the exhaust. Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted March 2, 2013 Report Share Posted March 2, 2013 The duct likely needs to be metal, but you'd have to check with the microwave manufacturer's instructions. (M1503/M1504) Quote Link to comment Share on other sites More sharing options...
John Dirks Jr Posted March 2, 2013 Report Share Posted March 2, 2013 I don't know about all that but the top of every micro/hood I've installed has had a damper on it. I've always used rigid duct for the exhaust. Ditto..if properly installed or not omitted, the ovens have the damper built in to them. Quote Link to comment Share on other sites More sharing options...
inspector57 Posted March 2, 2013 Report Share Posted March 2, 2013 M1503.1 General.Range hoods shall discharge to the outdoors through a single-wall duct. The duct serving the hood shall have a smooth interior surface, shall be air tight, shall be equipped with a back-draft damper, and shall be independent of all other exhaust systems. Ducts serving range hoods shall not terminate in an attic or crawl space or areas inside the building. ... M1503.2 Duct material. Single-wall ducts serving range hoods shall be constructed of galvanized steel, stainless steel or copper. This is from the 2012 IRC Key words for me are "smooth interior" and must be "galvanized steel, stainless steel, or copper" . Flexible metal ducts do not have smooth interiors and are not steel or copper, usually aluminum. Of course flexible plastic ducts are verboten anyway. It may be a microwave but if it is venting the stove top then it is a range hood. Quote Link to comment Share on other sites More sharing options...
David Meiland Posted March 2, 2013 Report Share Posted March 2, 2013 That looks like plastic flex with an insulation jacket, the only metal being the spiral wire that the plastic is glued to. Quote Link to comment Share on other sites More sharing options...
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