Multi-blade dampers

The round multi-blade damper can be used to control
and isolate air flow in round ductwork.
The round multi-blade damper design is based on the DSQW model.
This model, however, features a housing with a branch at each end,
sized to match the SPR ducts.

The DASQ / DASQL dampers are hand-operated. The DASQM / DASQML dampers
are designed for use with actuators.
All dampers have the blade angle (and the opening ratio) controlled
with a system of gears driven by a hand lever or an actuator.
The damper mechanism is installed on the outer surface of the housing.