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Hydrofarm Non-Insulated Air Duct – 4 in. – 25 ft. About Hydrofarm, Inc. Celebrated as the nation’s oldest and largest manufacturer of hydroponic equipment and grow lights, Hydrofarm has made professional-grade equipment available to all since 1977. All grow lights and electric components are UL listed, unlike many competitor products, meaning you get years of reliable and safe use out your high-intensity lights. All products are covered by a one year warranty, at the least. In some cases Hydrofarm ensures the performance of their products for five years. Non insulated 4 in. air duct. Aluminum construction for lasting performance. Dual layer thickness. Includes 2 stainless steel clamps. 25 ft. of ducting. Weighs 1.8 lbs. Measures 14.1L x 4.7W x 4.6H in.. Hydrofarm Non-Insulated Air Duct – 4 in. – 25 ft.