Energy saver air ventilator/roof ventilator/roof extractor/turbo ventilator available of various diameters 18", 21", 24", 28" etc. As per the customers requirements. For detail offer, you will required to submit following details mainly: A) premises length, width & height. B) nature of application used in the premises. C) detail premises dimentional drawing showing mainly inlet & outlet openings along with the wind direction. D) wind velocity at height of ventilator to be installed. E) present ambient temperature readings i.E. Temp. Inside the premises and outside the premises. F) existing roof sheet profile. Lot size : truck load/container load. Weight : light weight/ventilator approx. 4-8 kg. Range. Dimensions : 2.5ft.*2.5ft.*4ft. Approx. Of blower & frp sheet (base plate) 4ft.*7ft. L. * 2mm thick.