This is a new Carrier, Bryant, 100,000 BTU, OEM, Complete heat exchanger kit. This is all the parts you need to change out the complete heat exchanger assembly on many 100,000 BTU Carrier & Bryant HE, Infinity, & Evolution furnaces. 1 condensing heat exchanger, part # 334357-756. 5 Primary cell panels, part # 320723-751. 1 coupling box kit, part # 330539-754. 1 inlet panel kit, part # 320720-756. 1 outlet panel kit, part # 330541-754.