... wind 5.solid durable,long life time model standard power frequency watts 20inch 500mm 220/380 50Hz 180w 26inch ... can emit polluted indoor air, moisture, smoke, apply to industrial and mining enterprises, warehouses, kitchens, hotels and other public ... imports, with over-temperature protection, low temperature rise, low power consumption, insulation performance, long life operation. 2.CAD optimized ...