Used 150 sq. ft. Carbone of America model K150/150 graphilor block heat exchanger. Heat transfer area is 150 sf on process and service sides, with 3/8" diameter holes, with 4 pass on process side and 14 pass on service side. 6" and 3" process nozzles, 2" service nozzles, 75 psig @ -20 to 360 degrees F design pressure, teflon service and process gaskets. Overall dimension: 29 3/4" wide x 31 1/2" deep x 46 3/4" tall.