... 1:ce /ul 2:operate low noise 3:use in heater, fireplace 4: can customize cross flow fan with heating frame ... .3: cross flow fan widely used in fireplace ,heater ,air cleaner,cloth dryer , electric heater pump etc .4:package :hard carton and pallet5 ... :impeller 's parameter ,long, can produce according to clients's request heater /fireplace ...