Extruded Aluminium Non Return Damper Wall Mounted

Extruded Aluminium Light Duty Non Return Damper for One Way Restricted Air Flow with Rigid Aluminium Blades and gasket. Linkage can be provided to connect all blades as option for simultaneous and rattle free operation. Frame and blade are made of high quality extruded aluminium profiled construction with the advantages of corrosion resistance and rigidity. Air operated damper blades are fixed to the frame by self-lubricating nylon bushes. Blade edges are sealed with gasket to avoid rattling noise and to minimise air leakage. Blades open fully or at any angle depending on the air velocity and pressure. 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. Available in square and rectangular sizes. Frame is made of L shapes profile for wall mounting with 20 mm flange.