Rectorseal 85005 Slimduct 2.75" Wall Duct Kit, White 77Rectorseal 85005 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. Features 2. 75" Wall Duct Kit includes 5 fittings to cover up to a 13 ft lineset run with a 2. 75" (77mm) duct. Weather