Duraflo 6020BL Exhaust Vent with Collar Adapter, 16.2 in L, 24.06 in W, Plastic, Black

Installed on a sloped, shingled roof to exhaust range hood fans by the means of a roof penetration. Includes internal damper to reduce backdraft and an exterior dual flapper to prevent the infiltration and nesting of birds, vermin and insects.Unit: EAUPC: