Yescom 8" 720CFM Inline Duct Booster Fan Hydroponics Grow Tent Cooling Ventilation Exhaust Air Blower UL listed, CCC, CE, RoHS Certificated for safe use. Powerful and high efficiency - 2550 RPM and 720 CFM Overall Dimension:15"L x 8-1/2"W x 15"H Solid metal construction with black matt sheet. Flange: 8" Diam.