Master Flow 4 in. Dia x 5 ft. L R-8 Ductwork Insulation Sleeve

Insulate your new or existing 4 in. duct pipe with this Master Flow 4 in. Dia fiberglass insulation ductwork sleeve. Helps provide consistent air temperature and reduced system condensation and noise. On new pipe installation simply slide the sleeve over the 4 in. duct pipe as it is being installed. For existing duct pipe up to 4 in. Dia cut the jacket length wise (insulation is pre-cut) and wrap around the pipe.