The Dundas Jafine Roof Exhaust Cap is ideal for exhausting kitchen or bathroom fans through the roof. This product is made from high impact copolymer with a UV stabilizer to help prevent discoloration and has a molded barrier ring to help prevent leakage. Additional features include a backdraft damper to prevent cold air from entering the home and a removable collar for easy duct connection / installation. Brand Name: Dundas Jafine Opening Width: 5.75 in. Opening Length: 5.75 in. Color: Black Material: Plastic Product Type: Exterior Vent Hood Exterior Length: 6.5 in. Exterior Width: 11.25 in. Depth: 3.75 in. Collar Size: 6 in.