Back Pressure Louvre in Aluminium

Back pressure louvre with opening blades towards the exterior or interior, under order they can reinforce or interconnect. The frame is in L or in U. Blades in aluminium or steel galvanized depending of frontal velocity with dimensions of 250mm to 1.000mm in length and 120mm to 1.020mm in height, with a flow range from 300m³⁄h to 21.000m³⁄h.