The GL is a wall mounted device that is composed of a set of horizontally mounted blades that are normally closed and are free to rotate around their horizontal axis.
This louver serves as a non-return damper and can be used at the exit terminal of exhaust ducts and fans.
A certain pressure is usually required before the damper opens to expel the exhaust air, which ensures the elimination of back flow.
The blades are made from light weight aluminium sheets while the frame is made from extruded aluminium. 30 mm frame as a standard. 20 mm and 25 mm are available, if required