The MRCOOL MSHDK1830 Signature 1.5 to 2.5 Ton Air Handler Down Flow Kit is an installation accessory designed to convert compatible air handlers for downflow airflow configurations. It enables the air handler to direct conditioned air downward into the connected duct system, supporting proper airflow distribution in suitable installations. Designed for use with compatible MRCOOL Signa... https://www.partshnc.com/mrcool-signature-down-flow-kit-mshdk1830