Wrap exterior ductwork in fiberglass duct insulation from Grainger to help provide a vapor barrier and improve temperature control in HVAC systems that operate below ambient temperatures. Duct insulation wrap comes with a vapor barrier and a 2" stapling tab. Duct insulation board features square corners to help provide a finished appearance on duct and equipment systems. You can cut it with a utility knife and secure it with mechanical fasteners or adhesives. If you work with HVAC systems and power and process equipment, pick up your fiberglass duct insulation from Grainger.