... exhaust system,HVAC , rang hood ,clothes dryer vent ,inline fan air vent ,roof ventilation , ventilator use ,And so on.Low costs ... purpose exhaust applications including bathroom fans , furnace mounted humidifier units, air conditioning and ventilation system.Diameters 3” to 29” (75-736mm)Bend ... Velocity: 5500 FPMStatic Pressure – positive:20 in. WCTemperature Range: -30°C to100°C