A wall sleeve is a metal or plastic housing installed through a wall that holds a PTAC (Package Terminal Air Conditioner) unit or a "through-the-wall" AC. The sleeve acts as a structural support and a weather-tight seal, ensuring that the unit is properly pitched for drainage. Without a high-quality sleeve, water can leak into the wall cavity, leading to mold and structural rot. We carry a full line of ttw accessories to ensure your installation is professional and durable. These are particularly popular for hotel and apartment applications where Commercial Packaged Units aren't feasible. You can find the correct matching sleeve in our parts section for various brand-name units.