Used 12.2 sq.ft. horizontal shell & tube heat exchanger, Mfg. by Alabama Heat Exchangers, Inc. 316L stainless steel shell rated for 75 psi & FV @ 500 Deg. F., 316L stainless steel tubes rated for 125 psi @ 500 Deg F. Shell diameter 6.625'' O.D., 3/4'' Dia. tubes x 4' long. Serial #AHE-686, National Board # 367, Year Built: 2000, Previous Service V920 Vent Condenser - Multi-purpose, Estimated Weight: 356#