Features: 1 airfoil blade, curved front plate and cone curved impeller imported jet and other structures. 2. equipped with explosion-proof motor, with key parts of the surface to prevent static electricity or the use of non-ferrous metal manufacturing, prevents leakage friction spark of static and electrical components. Scope B4-72 explosion-proof centrifugal fan: B4-72 explosion-proof centrifugal fan is dedicated fan, suitable for the next fuel gas boiler, high concentrations of dust workshop, oil depots, gas stations, explosive materials storage warehouse, and so have installation of explosion-proof requirements of the occasion, can transport flammable gases and volatile nature.