Light, heavy air flow, low noise, strength, low pressure, good anti-temperature ... chocolate melting machine, microwave oven, electronic oven, lightwave oven and air-purify machine,etc.cross flow fan max length is 520mm ... alloy, so it have the advantages as following: Light, heavy air flow, low noise, strength, low pressure, good anti-temperature ... of the fan is: Aluminium alloy DC cross flow fan 30*29