This Imperial 4-in Premium Wall Exhaust/Intake Hood is an energy-efficient venting solution ideal for use with bath fans and range hoods. It features an innovative airtight damper that helps prevent back-draft and heat loss when used as an exhaust hood. To easily convert the 2-in-1 hood from exhaust to fresh air intake, simply remove the damper. An optional plastic pest control screen can be installed in bath fan and range hood applications, but must be removed if the hood is used for clothes dryer venting. Made of durable painted galvanized steel, this heavy-duty vent hood can withstand the elements and is paintable to match the exterior of your home.