Carrier Bryant Payne 320723-751 OEM Primary Heat Exchanger Cell Kit – New in Box. Genuine OEM Carrier 320723-751 Primary Heat Exchanger Cell Kit. Brand new in the original box and never installed. Includes the primary heat exchanger cell and installation hardware. Genuine Factory Authorized replacement part for compatible Carrier, Bryant, and Payne furnaces. New in original box. Box may show minor shelf wear. Please verify compatibility with your furnace using the part number before purchasing. The item pictured is the exact part you will receive.