◆ The unique flow technology applied to its shape is waterproof and rainproof with a large air flow and low noise. It is produced with the high-quality raw materials, which has a good shock resistance, ageing resistance and corrosion resistance. It is smooth inside and outside and can be used for more than 20 years continuously. 

◆ Its shell uses SMC mold pressing manufacturing and forms an integrated body. The surface is clean and tidy and easy to be cleaned without any micropore, which can save the cost of cleaning. 

◆ The blade uses SMC glass fiber reinforced plastic mold pressing and is formed by six blades. It is easy to install and is corrosion resistant, acid and alkali resistant and mute. It can operate more stably. 

◆ It has the new dedicated closed aluminum alloy motor and the straight type structure being free from maintenance, which can improve the efficiency, simplify the structure and reduce the maintenance cost. 

◆ The design of the shutter uses the principle of air downstream, which needs no electricity and manual switch. The automatic on and off settings of shutter can achieve the dustproof and water-proof effects, with elegant appearance.