The NBL centrifugal fan heater for centralized conveying a lot of warm air heating equipment, due to adoption of 9 - 57 type centrifuge the higher residual pressure head and out of the wind speed. Can be used for centralized sent from the machine design heating system, widely used in industrial and mining production workshop and large buildings, this type of fan heaters use heating medium is steam or 266-158 or 320-158℉ hot water.