This 44 inch Zero Clearance Liner is specifically designed for use in custom outdoor kitchens. Designed to fit the 44 Inch Built-In Grill BIG44RB this Zero Clearance Liner allows combustible building materials to be installed near or against the liner without fear of combustion or heat damage. This makes for greater flexibility when installing Gas Grills in an outdoor kitchen application. Please consult your manual for installation instructions.