Alfresco AIJ-42 Insulating Jacket for 42-Inch Grill provides a high quality accessory for use with your Alfresco 42-inch ALXE built-in grill. Constructed with durable 304 stainless steel, this insulating jacket is designed to withstand the elements. It is required for use when installing the grill in a combustible cabinet but can also add insulation for non-combustible grill islands.