These aluminium ventilation grilles are used in supply and exhaust ventilation, various duct systems, air conditioning. The perforated ventilation grille is made in the form of a frame made of a profile and a perforated sheet fixed to the frame. Grille fixing options - standard screw fixing and concealed snap fixing. Grille installation options - in ducts and building openings. Possibility to equip with an adapter. Adapters are available with either lateral or axial connection to circular or rectangular ducts. Note Standard coating colour - white RAL 9016 is not specified when ordering (painting in any other colour according to RAL colour catalogue is possible). Minimum grid size 100×100. The size of the grille is determined by the size of the opening for installation.