High capacity, mobile air blower, easily fitting in the locker of a fire truck. The unit is ideal for creating positive pressure in multi-storey residences, commercial buildings, stores, high risers, aviation hangars and warehouses, in order to push smoke and toxic gases out. Can also be used for supplying fresh air to working areas, e.g. in pits, channels and tanks. This unit is not explosion proof, and should therefore not be used in dangerous zones. The turboventilator is fully encased in a stable frame and provided with pneumatic tyres for easy handling. Two wooden wedges for holding open doors are included.