"220V AC Cooling Fan" good chemical characteristics: acid or alkaline corrosive substances, superior temperature resistance: suitable for a temperature range of -40 to +75 (note: the value of special protective layer) pinhole-free film, film uniform thickness, 0.01mm thin film, colorless and highly transparent material: environmental protection, antibacterial, anti-corrosion, weathering grade waterproof fan can operate normally without burn-in at 50 cm of water.