Industrial ventilator, The design allows the vent to spin freely under wind load and provide the same exhaust rate as the traditional Hurricane vent. The free area of the throat is NOT impeded, unlike current vent fan combinations. When required the vent can be powered which provides a huge boost to the flow rate, at an extraordinarily high efficiency; 110 m3hrwatt of energy - far more energy efficient than any conventional powered fan.
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Karjat, Ahmednagar, Maharashtra