Cooper motor keep the high performance; Keep running for 8000 hours trouble-free low noise ,strong and stable air speed Overload protector ABS impeller for durable use 
Unique arc shape with smoothly air duct φ115mm impeller,big air volume Powerful motor with stable pressure Power-off memory function
Remote control and manual for option Press bottom on body Easy installation Adjustable air deflector angle from 0-15° UV lamp for option 
Sales increase due to the “open door effect”. Doors open is an invitation for customers Free access for disabled people (wheelchair) or people using baby strollers, trolleys, umbrellas, etc. Help to keep the indoor air clean by stopping the bad odds inside Increases customers and staff comfort Saving more money due to saving more energy by opening the door frequently Energy recovery ventilation systems provide controlled ventilation while minimizing energy loss. They reduce the costs of heating ventilated air in the winter by transferring heat from the warm inside air being exhausted to the fresh (cold) supply air. In the summer, the inside air cools the warmer supply air to reduce ventilation cooling costs.
Ventilation is not an effective cooling strategy in hot, humid climates where temperature swings between day and night are small. In these climates, however, natural ventilation of your building (often required by building codes) will help to reduce your use of air conditioning, and attic fans may also help keep cooling costs down.