... textile, chemical, medicine, tea, vegetable storage, and supermarketDJF-C series Cone exhaust fansReasonable cone designing, low noise, big air ... ,Imported bearingUsing air downstream principle, pvc shutter or aluminum shutter,antioxidant, light weight, no distortion,open and ... prevent backflow of airHigh-strength more high-gluten strength aluminum-magnesium alloy wheel, light weight, high strength, ...