1145W 140 x 140mm Egg Crate Grille White 100mm/4Inch. Ideal for use at home on external walls to cover and secure venting outlets of 4 inch diameter. Egg Crate Grill suitable for use with 4” 100mm extractor fans via round rigid or flexible ducting. Prevents back draught air and rain penetration. Grile width 140mm screw holes approx 105mm apart. Can be used to replace an existing Grille or the same spec or for a new installation. Air conditioner, tumble dryer, extractor fan, air circulation.