Transition duct with insulation glasswool details in AutoCAD, dwg file.
<p>This Architectural Drazwing is AutoCAD 2d drawing of Transition duct with insulation glasswool details in AutoCAD, dwg file. <strong>Fiberglass insulation</strong> is the most common type of air duct insulation on the market. R-values range from R-4 to R-11 for ductwork. Fiberglass insulation comes in two distinct formats: flexible or rigid. Flexible fiberglass insulation for air ducts wraps around ductwork.</p>