David Meiland Posted March 7, 2015 Report Share Posted March 7, 2015 As far as I know, this is a barometric air inlet. It's connected to the return plenum of a forced air system, in an attic filled with blown-in fiberglass insulation. I believe the air handler was not running when I took the photo. In general, I expect these to be ducted to the outdoors when I see them, rather than drawing air from the attic or crawl space. More often than not they are motorized dampers wired to the air handler, instead of barometric types. This one does not appear to be designed to have ductwork attached to the upstream side, and I believe it's actually designed for use on a flue. The ductwork dates to 1990, and I have no idea what the code was then. Any thoughts? Click to Enlarge 40.88 KB Quote Link to comment Share on other sites More sharing options...
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