... 55, E Class - Each motor is individually tested for 100% quality control. Our shutter can open ,close automatically and completely ... one year.Our fan can work for more than ten year in normal environment and it can work about 4 ... , station, gym, school4.Animal husbandry: poultry house, pig, chicken, rabbit, cow barn5.Agriculture: horticulture, greenhouse. greenhouse cooling equipment for vegetable farm