The American Made Grills Insulated Grill Liner (GL-HYB54) is a double-lined 304 stainless steel insulating jacket required for installing the Encore and Muscle 54" Built-In Hybrid Grills into an outdoor kitchen island constructed from wood framing, composite materials, or other combustible surfaces. Local building codes require a non-combustible barrier between gas appliances and combustible island materials — this liner creates that barrier with 1" of double-wall insulation, blocking heat transfer from the appliance to the surrounding structure. Purpose-built and precision-sized for a seamless fit with the Encore 54" (ENC54) and Muscle 54" (MUS54) built-in hybrid grills.