1. frame: Galvanized steel sheet, anti-corrosive and durable.  Thickness: 1.0mm for the top and 0.8 for the other sides  

2. Blade: 6 pieces of mirror finished stainless steel blades,  attractive and durable with big air volume, passing the homeostasis test to ensure the air volume keeping the same as the very beginning during the operational life span, low noise, no distortion, no broken, Thickness: 1.2mm.  

3. Motor: Siemens motor or Chinese motor, high efficient and energy-saving with CCC certificate. Protection class: IP55, Insulation class: F. The voltage, power, Hz and phase can be customized.    

4. Shutter: Made of high strength hot-galvanized steel sheet, dustproof and waterproof. Thickness: 0.45mm  

5. Swung drop hammer: Made of high quality nylon, stable performance, guaranteeing the shutters open and close flexibly.  

6. Protective net: Made of hard-drawn wire, designed as door-type, which is convenient for maintaining.