The Sun Shield Duct Covers work similarly to the Sun Shield Reflector Covers. They are specifically designed to work in conjunction with 6†and 8†flexible ducting used to cool your light systems. These covers contribute to improving the efficiency of your air-cooling system by containing the heat and allowing it to be exhausted from your lights and out of your growing space. These Duct Covers are intended to be used only on actively air-cooled reflectors. See "Product Videos" on home page to see Sun Shield in use.