For moving air into smoke filled rooms when fighting fires 1. Low sound 2. 1year warranty 3. Strong power 1,Large-capacity turbine smoke machine, suitable for warehouses, commercial buildings and large buildings;2,Honda 5.5hp engine, reduce noise, vibration, increase security3,Cast-aluminum turbine blades, high balancing precision, 1800 rpm / min, 29355m3/hr Forced smoke ventilator