Not all homes are constructed with the same parameters. The Windster H Series Extension Duct Cover is here to help even the playing field. Your new Windster H-series range hood comes with a duct cover for average ceilings; this handy extension kit is provided for taller ceilings between 9- and 10.5-feet high. The duct cover is made from durable, solid stainless steel and is welded together for a seamless design without sharp edges. The duct cover has been approved for use by the CSA for use in both US and Canadian homes.About Windster Hoods For over a decade, Windster Hoods has provided North American consumers with superior-quality range hoods, filters, and other ventilation and kitchen equipment. Each unit produced by Windster Hood is designed to meet or exceed the standards defined by the CSA, conforming to governmental and regulatory codes. Windster products are constructed with a focus on safety and functionality, featuring smooth edges, single-piece designs, and precise welding. Since 2003, Windster has risen to become a trusted name and industry leader. Under-cabinet, wall-mounted, island units and more are all produced on-site and delivered directly to business owners from the Windster warehouses.