The Garrison Packaged Terminal Air Conditioner Sleeve is used when installing Packaged Terminal Air Conditioners (PTACs) model air conditioners. This is a universal design that should work with standard 42 in. W x 16 in. H size PTACs on the market. This is not designed to work with any other type of air conditioner. Wall Sleeves are recommended to be installed by a professional and designed to hold PTACs air conditioners.