External and Internal Ventilation Cover Recommended for ventilation ducts at high temperature. Used as supply and exhaust air grilles to the rooms inside and outside the building. They have a universal attachment to substrates such as plaster, gypsum-cardboard, wall panels. Simple To Fit Dimensions: A - 200mm, B - 123mm, X - 163mm, Y - 240mm, C - 28mm, E - 24mm (Collar)
