Wall mounted intake and outake grilles are made of galvanized or aluminium sheet in a range of dimensions from 200 x 200 to 2000 x 2000 mm. They are composed of lateral profiles, lamellas and proper corners and of a steel mesh protecting against insects and leaves. They are used for big installations inside buildings.
Intake-outake grille , depending on a type, is made of chromium-nickel sheet in a diameter range 100 to 200 mm, or of aluminium. It is additionally equipped with a mesh protecting against insects. It is also available as a non-return flap in which only one or a part of lamellas opens during air exhaust.