The MRCOOL M14HSR2436A Signature Series Horizontal Application Square-to-Round Adapter Kit is designed to connect square ductwork to round ductwork in 2–3 ton MRCOOL Signature Series package units. Specifically engineered for horizontal HVAC installations, the 14-inch adapter provides a smooth transition between different duct shapes, supporting consistent airflow throughout the syste... https://www.partshnc.com/mrcoolr-signature-square-to-round-adapter-m14hsr2436a