White Adjustable Air Vent Grille with Flyscreen Cover 9" x 3" (229mm x 105mm) White plastic adjustable vent with flyscreen. Maximum opening the vent will cover: 9" x 3" Overall vent size: 11" x 4" (280mm x 105mm) Adjustable open or closed / on and off vent. Concealed screw design. Easy surface mounting. Low profile design. Meets building regulations. Other sizes and vents available in our shop.