Quick Snap Wall Sleeve Assembly Standard 42 X 16 X 13.75-In Wall Sleeve Lined With Acoustical & Thermal Insulation Made Of Heavy Duty Galvanized Steel Powder Coated Paint For Superior Adhesion & Protection Exterior Weather Barrier Included For Construction Phase Key Hole Slots For Easy Rear Grille Mounting Sturdy Four Piece Design Color Matched For Hotpoint Series