White polystyrene air exhaust valves for dwelling and commercial applications.
All models offer an adjustable central valve to regulate the airflow. They can be used in heating, air conditioning and ventilation systems.
Operation range from 40 to 150 Pa.
The central mobile shutter can be used to control the airflow by utilising a central adjustment screw.

Versions:
-Adjustable inlets with a clamp for installation in plasterboard BOR-P
-Adjustable gasket openings for conduit installation: BORJ