... 1)wide rage sizes; 2)stable motors; 3) quiet, big air flow. cross flow fan motorMaterial: aluminium alloy & galvanized sheet, or ... The motor is Ul&cUL&CE&VDE certified. Description:Big air flow and nice design 220V / 110V can be chosen in ... vibration, are commonly used in HVACsystems, machinery for heating, ventilating, air conditioning, drying, dehumidifying,etc. Fans can be served in insulation class ...