XYF Air Fans are widely applied in household, light commercial and industrial use (for example, houses, hotels, offices, stores, factories, etc.) to exhaust, circulate, renew and filter air. As combining with the unique design of the shell and the backward centrifugal impeller motor, the fans are the perfect mix with the appearance and structure, to maximize the gas and fluid dynamics. The PF-series is specially designed for the home retrofits on radon level mitigation. Details: - Durable and strong plastic housing (ABS+PC) with UV protection ingredient added to resist yellowing, fading, or changing color, low noise operation due to the silent cotton structure inside - Proprietary deigned backward inclined centrifugal impeller (PA66+glass fiber) builds high volume suction and strong air exhaustion - External rotor motor with thermal protection and SKF brand double ball bearing system, life expectancy up to 50,000hrs - Moisture resistant, true IP67 waterproof rating which is suitable for both indoor & outdoor installation - Class F motor insulation standard, UL94 V-0 flame retardant thermoplastic used