... 2.Import belt 3.Air Volume 46000m3 / h 4.Shutter adopt special push-pull, open- close device Provide 7*24 hours ... 2. The aluminum metal alloy of the high strength hub, adopt aviation aluminum magnesium metal alloy, light weight, high strength, good ... adjust automatically, no need manual adjustment during lifetime 4.Shutter adopt special push-pull, open- close device, ensure shutter totally open ...