The MRCOOL M14DSR4260A Signature Series 3.5–5 Ton Downflow Application Round Adapter Kit is an HVAC installation accessory designed to facilitate proper duct connections for compatible Signature Series systems. It works by adapting the air outlet configuration to a round duct connection, allowing conditioned air to flow efficiently through the connected ductwork. Designed for use with... https://www.partshnc.com/mrcool-signature-series-14-downflow-adapter-kit-m14dsr4260a