Frame: High quality extruded aluminum profile with 30mm flange width as standard. And nonstandard widths are available as option.
Blades: Aluminum sheet as standard and galvanized steel sheet as option.
Blade seals: Foam gasket to avoid air leakage.
Frame made from high quality extruded aluminum profiled. .
Blades are sealed with foam gasket at the bottom to avoid rattling noise and to provide air tight operation. .
Blades open full or to any angle depending on the air velocity. Blades stay in position of opening without fluctuating when there is constant air flow. Blades close quietly when the air flow stops.
Designed to maintain constant pressure level inside pressurized rooms by relieving excess air when it exceeds the desired limit.
Generally installed on diesel generator plant rooms ventilation system and exhaust ducting.