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. In "Waterproof Cooling Fan" most unfavorable position with a 10 °angle plane, the fan should not be overturned. On "Waterproof Cooling Fan" should nameplate production factory, product model specifications, rated power, rated voltage, power and frequency indicator species.