The aluminium damper blades and other prefabricated
accessories for DSQW-A dampers allow shop and on-site
fabrication. The blades are dimensioned to facilitate quick
assembly.
The prefabricated components are identical to
those used in DSQW-A dampers, except plastic slide-in pieces
and blade sections which provide a non-return operation by
opening in one direction of the flow and closing in the other.