No use of electricity – wind driven, maintenance free, Fresh air 24X365 days, Uniform & continuous ventilation, Noiseless installation, Easy to install, Withstands high wind velocities, No ingress of rain water proof Fits on any type of roof surface and gradient, Exhaust stale, hot humid air and fumes / pollution nonstop, Reduces maintenance of plant and machinery by reduction of fumes & humidity level, Healthy living-increases productivity, Environment friendly, Payback period is extremely low.