The SSNM-10 Series and the SSNM-30 Series are the newest models of stainless steel backdraft dampers available in Greenhecks backdraft damper line.
Horizontally-mounted, the SSNM-10 Series is designed to allow vertical airflow up while preventing reverse airflow.
Both models open by air pressure differential and close by gravity, and are rated for pressure differential up to 2 in. wg., with a velocity of 2,500 fpm. The models frame construction are available with no flange, flange on discharge and flange on intake.
Image courtesy of Greenheck