Slimduct Lineset Covers offers strength and longevity with a professional aesthetic. Available in 3 sizes and colors, Slimduct Lineset Covers accommodates numerous applications including single or multiple exposed linesets. A robust assortment of fittings ensures each system is finished with a professional touch. Flex Adapters connect the Flexible Elbow to the 3-3/4" Duct. Weather resistant PVC, UV stabilized & fire resistant. Tested to over 2,000 hours. Temperature range -4 to 140 deg F. Complements any residential or commercial building.