Rectangular dampers are produced in three versions. The first one is the multi-blade damper DSQW.
Its housing is made of galvanized sheet and its closing blades are of aluminium. Additionally the blades can be equipped with the EPDM seal to increase leaktightness of the damper.
Maximal dimensions of the damper are limited by its width and equals to 1400 mm. The second one is the multi-blade damper DSQWA in which all elements are made of aluminium profiles.
In case of bigger dimensions the damper is composed of 2 or 3 segments. The third one is the galvanized single-blade damper DSQ which is applicable for maximal cross-sections 600 x 600 mm.