The Lennox X9953 Harmony 3 4-Zone Control Panel is an advanced zoning control system designed to manage the temperature in up to four separate areas of a home or light commercial building. It works by coordinating motorized zone dampers, thermostats, and compatible Lennox heating and cooling equipment to direct conditioned air only where it is needed. Commonly used with Lennox furnace... https://www.partshnc.com/lennox-x9953-4-zone-control-panel