https://www.khanbrothers.net/shop/product-id-pr-2324001047-model-020b1054-check-valve-nrv-19s-max-working-pressure-bar-49-020b1054-9151
Check valve, NRV 19s, Max. Working Pressure [bar]: 49 (020B1054) | Khan Brothers
The GM-30 series backdraft dampers allow horizontal airflow and prevent reverse airflow. Dampers in this series include the GM-30 (no flange), GM-31 with a...
check valvemax working