Exhaust fan (centrifugal shutter system Exhaust Fa

DJF series Centrifugal Shutter System Exhaust Fan /ventilation fan(Auto push-pull type exhaust fan. ) Centrifugal shutter system:1) Adopt the this system which open and close automatically when the fan works.2) Centrifugal shutter system and other fitting of shutter made of Nylon, high quality , 100% raw material, high strength, and long service life. 3) The inner steel fitting install in the flange, increasing the security, avoid the stretching change when Nylon system operates. Blade:4) Adopt the injection molded Stainless steel blade, no broken, no distortion, aesthetic and durable.5) Balance running machinery checked the entire fan blades balance; ensure operating steady, low noise, long service life.6) Adopt the handle as new inset design from our engineer, easy for carry, transport and installation. Also has no affect on the appearance. 7) It made of high quantity aluminum-magnesium alloy, light weight, high strength. 8) We could supply V-belt as the type A or type B, upon the varieties demand of different customers. 9)The high efficient and energy-saving motor passed the national CCC certification. Also protection class: IP55, insulation class: F grade. Technical parameter of centrifugal shutter exhaust fan: Belt tensioner which is made of aluminum alloy can extend service life and avoid distortion.Tension inside of belt could avoid twisting inverse. Nylon oriented poples are fixed on the flange which could avoid distortion of nylon and gurantee total concentricity and back bearings. Handles are designed as recessed type,easy to carry,transport and have no effect on installation and outlook. Balance running test machinery of blades would make fan turn evenly. Various kinds of belt tensioners for option. Famous brands of belt:SANLUX(CHINA),DONGLI(KOREA) AND MITSUBOSHI(JAPAN). Sections of belt:type A,type B and type A(cogged). Motor for your choose:Chinese famous brand motor.SIEMENS Motor,ABB Motor and TAIWAN Motor.The motor specification could be changed upon your special request such as voltage,frequency and phase. Blade can be made of stainless steel,galvanized steel,aluminum alloy or fiberglass.Besides,frame material of fan can be stainless steel or galvanized steel.And the shutters can be stainless steel,galvanized steel or aluminum alloy. Air flow curve of centrifugal system exhaust fan: