... fan for greenhouse 1,Large air flow , 2,Low noise 3,Low energy consumption 4,Long service life industrial electric fanThe fan ... no broken, attractive and durable. (adopting aluminum fan blade in the past, which had some problems ... working of metal in the factory cooling, for example broken and air volume decreasing).1. ... ″),900mm(35″),1000mm(39″),1100mm(43″),1220mm(48″),1380mm(54″),1530mm(60″)nine kinds.5 ...