Positive pressure ventilation fan for effective control of heat, smoke and toxic gases. Powered by a Tecumseh 10hp air cooled engine and housed in a compact frame. Key features include 27inch diameter fan made of 9 glass reinforced polymide blades protected by a strong thermoplastic shroud, electro polished stainless steel frame fitted with retractable handle and pneumatic tyres for easy manoeuvrability. Quick tilt mechanism allows fan to be set at optimum angle for smoke control.