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Flexible Duct Sheet Metal Fittings
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A GUIDE TO INSULATED HVAC DUCT SYSTEMS
insulationinstitute.org(2) Rigid boards, supplied in sheet form. Fig. 2. Sheet metal duct lined with fibrous glass insulation Duct liner secured to sheet metal with adhesives plus metal fasteners Available in thicknesses from 1/2 to 2 in. (13 to 51mm) Tough airstream surface resists shop, installation, and service damage Sheet metal ducts must be tightly sealed