Yield Lab 4 Inch 190 CFM Air Duct Fan Vent SystemThis 4 inch duct fan features a high power motor and an aerodynamically designed shape, it is the perfect fan for your small indoor grow room. It is able to move air through long stretches of ducting, grow light reflectors or carbon filters. With a tape flange, it is rather convenient for you to place the ducting on the blower and tape it in place. Exchange stale air with fresh air to keep temperature or humidity under control and cool your reflector
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