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Round non-return (Backdraft) dampers

Photo of product DAOS

Backdraft damper

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.

Types of backdraft damper

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).

Alnor Ventilation Systems
Krakowska 10 Avenue
05-552 Wola Mrokowska

tel. +48 22 737 40 00