Powered rotating "220V Cooling Fan" housing, electricity meter to measure the leakage current is not greater than 0.3 mA. In the swing position to start with the most low-speed fan, the fan should be quickly up to speed. Change to the most high rotation speed, the smaller the better the noise, the fan does not move as a whole should be smooth, to a large amount of wind. When changing the speed, air flow should be significant changes in the stall, a smooth swing. Swing angle, 250 mm below the "220V Cooling Fan" not less than 60 degrees, 300 mm above the fan may not be less than 80 degrees. Rocker per minute, on the fastest speed at not less than four times. To have the timer, to check its accuracy, 15 minutes there is an error ± 1 minute even if qualified. The maximum effective distance from the stop function induction "220V Cooling Fan", according to the instructions provided in the hand test whether from the stop. Thermometers for measuring the motor housing, the most high-end speeds in 15 minutes, the temperature should not exceed 30 degrees Celsius.