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Amazon.com: Simond Store Ceramic Fiber Insulation Board - 2300F Rated - 0.47 Inch X 18 Inch X 24 Inch - Pack of 1 - Ceramic Thermal Insulation Board for Wood Stoves Fireplaces
Ceramic Fiber Insulation Board (2300F) (1/2" X 19.7" X 39.4") Thermal Insulation | eBay