Used 30 Square Feet (approx.) Monticello Hastelloy Horizontal Heat Exchanger. Shell (SB-366-C276) rated 150/FV @ 250 degrees F, Tubes (SB-626-C276) rated 150/FV @ 250. U Tube Type. 12 Tubes, .75" OD .065 AVG. (1) 1 1/2" Inlet, (1) 1 1/2 Outlet, (1) 2" Vapor Inlet, (1) 2" Vapor Outlet, (1) 1" Liquid Outlet. Serial # T103112, NB # 5529. Built 1994.