The MRCOOL M14HSR2436A Signature Series 2–3 Ton Horizontal Square-to-Round Adapter Kit is a duct connection accessory designed for MRCOOL Signature Series package units in horizontal applications. It converts the unit’s square duct openings to round duct connections, providing a secure transition between the HVAC equipment and round ductwork. This adapter helps support proper airflow,... https://www.partshnc.com/mrcoolr-signature-square-to-round-adapter-m14hsr2436a