The MRCOOL MSHDK1830 Signature 1.5 to 2.5 Ton Air Handler Down Flow Kit is an HVAC installation accessory designed to configure compatible MRCOOL Signature Series air handlers for downflow applications. It works by providing the necessary components to properly direct conditioned air downward through the duct system while maintaining efficient airflow and system performance. Commonly ... https://www.partshnc.com/mrcool-signature-down-flow-kit-mshdk1830