Industrial exhaust fan with a major role in ventilation fan (large air volume, low noise, long life. 1. Air conditioning: effectively eliminate smoke and dirty air and inhale fresh air. Two: peculiar smell eduction, eliminate the peculiar smell that stays in the kitchen and toilet quickly. Three: drive away damp, eliminate bathroom moisture quickly, prevent building decay. 4. Control the hot air, eliminate the dirty hot air, and supplement the cold air to make the room comfortable.