4" x 25' Aluminum Semi-Rigid Flexible Dryer Vent Duct 4″ DIAMETER. 25′ LENGTH CLASS O FIRE HAZARD - UL Listed CLASSIFICATION. MAX VELOCITY= 4000 FPM, MAX RATED PRESSURE= 4″ WG +VE/-VE, OPERATING...
4" x 8' Aluminum Semi-rigid Flexible Dryer Vent Duct 4" DIAMETER. 8' LENGTH. UL LISTED. CLASS O FIRE HAZARD CLASSIFICATION. MAX VELOCITY= 4000 FPM, MAX RATED PRESSURE= 4" WG. +VE/-VE, OPERATING...