Appearance of Type 880-B blade:36 height:980mm turbine diameter:880mm ventilation caliber:680mm(upper round)880*880mm(down square) Advantages of Type880-B 1、Non-power natural ventilation fans are favored by many businesses for their energy-saving and environmental protection, the 880-type fan with its large-caliber ‘breathing ability is especially favored by chemical、plastic and other special Industries. 2、Its high-quality body can withstand long-time wind and rain; resist the erosion of corrosive gases indoors. It can be durable eternal lubricant and no maintenance for its excellent low resistance sealed bearings. 3、Wave-shaped leaves is designed based on the accurate hydrodynamics principle, increased the interface and angle between the fan and wind. It also can get a greater rotational force in the breeze, avoiding the wind of all direction into the air duct, accelerating the rotation speed of the turbines.