All Categories
Product Description Fortress standard professional grade duct and fittings. More moderate price point. Fortress professional duct/fitting system hides unsightly ac line set. 2 duct sizes - 3.5" and 4.5", accommodate single or multiple line set configurations. Longer ducting length - 8Ft. Allows for fewer joints. From the Manufacturer Fortress Standard professional grade duct and fittings. More moderate price point. Fortress professional duct/ fitting system hides unsightly AC lineset. 2 duct sizes - 3.5″ and 4.5″, accommodate single or multiple lineset configurations. Longer ducting lenght - 8ft. Allows for fewer joints.