JLF series centrifugal type exhaust fan with big a

our centrifugal type exhaust fan have the greatest avantage just as belows:1.patented designed centrifugal system which can open and close automaticlly ,ensuring the shutter opens 90 degree under all the condition. And uncontrollable air can prevent from going into the birdhouse when the shutter works.2.Mirror designed and injection moulding Stainless steel balde,with big air volume,never distortion and broken3.experiment of homeostasis make the blade work smoothly,nearly no noise and steadily output of air4.centrifugal shutter system made of high quality engineering nylon ,high strength and long service life5.high efficient and energy-saving motor with ccc certificate ,protection class:IP55,insulation class:F gradeModel specificationsBlade mmBlade rotational speed rpmMotor rotational speed rpmAir flow m3/hTotal pressureNoise decibelsImport powerRated voltageHigh mmWidth mmThick mmJLF-1000(43inch)90061014003000070≤7075038010001000400JLF-1380(54inch)125043914004400056≤70110038013801380400