BACK draught shutter Passad

The backdraft damper closes the duct and prevents cold air from flowing in when the fan is not running. Suitable for retrofitting to Pax Passad 00 and 30 fans, as well as the older Passad Multi model. Install by removing the existing shaft cover (use the backdraft damper as a tool). The backdraft damper prevents airflow in the wrong direction. It is assumed that the building's basic ventilation is handled in some other way.

Note! The backdraft damper must not be used in a gravity-based ventilation duct (in the roof/chimney), as the natural air exchange must not be blocked. The damper prevents airflow in a self-drafting duct, which is detrimental to the structure and indoor air quality.

This product description is an automated translation of the original Finnish description.