(B)Quick Snap Wall Sleeve Assembly(/B)(BR)(BR)(B)Standard 42 x 16 x 13.75-in wall sleeve(/B)(BR)(BR)(B)Lined with acoustical & thermal insulation(/B)(BR)(BR)(B)Made of heavy duty galvanized steel(/B)(BR)(BR)(B)Powder coated paint for superior adhesion & protection(/B)(BR)(BR)(B)Exterior weather barrier included for construction phase(/B)(BR)(BR)(B)Key hole slots for easy rear grille mounting(/B)(BR)(BR)(B)Sturdy four piece design(/B)(BR)(BR)(B)Color matched for AZ45/65 Zoneline series(/B)(BR)(BR)