... fan 1.High efficiency,Easy to operate,Low noise, 2.Used in furnance ,boiler,and forced ventilation 3.ISO&CE BOILER CENTRIFUGAL ... The main products are :anti-corrosion fan.special for metallurgy fan.special for annealing furnance fan.impeller:blade. brick kiln dedicated fanWe export ... be divided into10 specifications according to the impeller angle, each type of blades can be mounted by 15°, 20°, 25°, 30 ...