Arched cast iron surround for gas fireplace inserts, For use with GI3600, GI3016, GDI-30, NPI40, and NPI45, Suitable for openings smaller than 29"" H x 46"" W, Made with attractive and durable cast iron, Elegant painted black finish, 6"" flashing required for installation must be purchased separately, SKU: CPPF7173