Backdraft dampers also refer to as non-return dampers have a split flap closure and allow the airflow to pass in one direction only. The aluminium closure flaps are pressed against a foam seal when closed to reduce the operating noise in the ductwork.
The split flap closure is held closed with a spring gear, which makes it also possible to use the backdraft damper in vertical installations.
Backdraft dampers are available in versions with a rubber seal (DAOSL) and without (DAOS); backdraft dampers with additional reinforcement rod (DAOSL-B and DAOS-B);
backdraft damper that slips inside the ducting (DAOSL-IN).
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