l 1 appendix through the wall products introduction some residential unitary are designed primarily as replacement to fit within an existing building space with fixed dimensions which might be either interior enclosure a part of s envelope or both can constrain product ability improve efficiency using same options available that do not face constraints particularly increasing heat exchanger surface section 4 6 engineering analysis chapter this tsd provides additional information on these constrained also known niche install exterior susceptible those since they must exchange outdoor air single and opening costly modify termed ttw equipment two distinct versions identified condensing unit split system conditioner pump package purpose is provide detailed description methodology results used estimate
