In "Waterproof Cooling Fan" most unfavorable position with a 10°angle plane, the fan should not be overturned. Quality "Waterproof Cooling Fan" should have the following characteristics: appearance, lines, color nice; plating smooth, shiny, no yellow, rust, peeling and waterlines phenomenon; film hard, smooth, no bubbles, scratches, no paint off, open at the end, hanging paint or paint mix different phenomena; decorative pieces without damage, front and rear grille fit tightly, no distortion, no solder wire nets loose sealing off and so on. On "Waterproof Cooling Fan" should nameplate production factory, product model specifications, rated power, rated voltage, power and frequency indicator species.