GF ventilation duct fan at present is our new product researched and developed on the basis of absorbing foreigned advanced technology.With different parts shaped by mold,impellers designed and made by multi-winged centrifugal technology,the whole fan is featured by nice appearance,small size,low noise,large air volume,light weight,stable operation and other excellent features.It can adjust and control the air in he places such as hotel,restaurant,department store,houses and place of recreation.But these places shouldn`t contain flammable,explosive,toxic and corrosive gases,with a temperature no higher than 60℃.