... 2, the low consumption, low operating cost.3, the use of special motor, and the wind straight even when type structure ... brain) raising efficiency, simplified structure, no maintenance fee.4, aluminum alloy wind leaf, durable deformation.5, FRP (FRP) material shell, ... 45220/380120140060certificatesmore info ,pls visit www.fd8888.com sales industrial use entilator.good quality good price,ce certificate