Rectorseal 84044 Fortress Lineset Covers 3.5" Duct 7.5' Length, Gray 92Rectorseal 84044 Fortress Lineset Covers provide a durable and cosmetically appealing solution to protect components on the building exterior. Moderately priced, Fortress is compatible with a variety of A C systems, conceals and protects linesets, wiring and drain hoses from weather and damage. Features Fortress Ducts are used in long straight runs and the 7. 5ft length (1 1. 5 ft longer than other brands) reduces the need for a coupler. PVC, UV