Tested in USA as per AMCA 500 D standards for leakage
Tested for operations up to 3400 fpm maximum air velocity
Class 1 Leakage < 1.35 cfm/sq.ft @ 4 in w.g
Class 1 Leakage < 5.1 cfm/sq.ft @ 8 in w.g
Damper can withstand duct pressure up to 20 in w.g (5000 Pa) without any failure.
Offshore, marine, processing plants, chemical plants, Nuclear and other power plants.