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4 Inline Duct Fan 70 CFM Duct Booster Fan with Backdraft Damper 2550 rpm 32 dB I Product Description 4 inch duct fan is EASY TO INSTALL and can be inserted inline in 4 inch diameter metal ducts and 4 inch aluminum ducting this intake fan has an attached FREE Backdraft Damper ensuring no unwanted drafts enter.4 inch fan inline duct fan can be used 24/7 and comes with a year long hvac 4 in inline fan . The 4 inch inline fan can be controlled with a dimmer or speed controller (not included).Inline fan 4 inch is the perfect 4 booster fan to increase the airflow as your small fan for grow tent, or increase air circulation in crawl spaces, basements, garages, kitchens, bathrooms or helping your dryer exahust get outside.4in inline fans have a 2 wire cable 2 x 0.75mm² attached with plugs for EASY CONNECTING, no earth cable needed fans for the 4 inch in line fan. The versatile intake outake fan can be hooked up to a speed controller, timer or humidity sensor.Fan 4 inch duct technical data has 70 CFM inline duct booster power, 2550 rpm, 32 dB volume, IPX4 (protection against splashing water), +5 ° C to +40 ° C ambient temperature, 110V voltage, 60 Hz frequency, 0.35 Kg

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