Access Panels UK Air Vent Grille Cover 300 X 300Mm (12 X 12Inch) Ventilation Cover Air Vent Grill Cover VM-300x300mm (12 x 12inch) ASA Plastic, Colour: WHITE Equipped with fly screen Comes with 4 Fixings Designed To Cover Wall Or Ceiling Openings And Ducting Vents Dimensions (A-270) (B-270) (X-305) (Y-305)