Yuanbohua series 72/84-inch fiberglass wind duct fan, large-scale fan development product. When the exhaust fan is selected, it is suggested to consider the important standards below: Air-flow ratio, air-flow capacity and energy efficiency. If one fan could drive more air volume, it is recommended to use few fans to meet the ventilation requirements, which could reduce the installation and maintenance costs. The 72/84-inch fiberglass wind duct fan is designed for the modern ventilation of livestock.