Used 500 Sq. Ft. Standard Boiler and Tank Horizontal Industrial Tube Heat Exchanger S/N# 94-337. 304SS Shell rated 100 @ 300 deg. F; SS Tubes rated 100 @ 300 deg F. Shell - 1 pass, Tubes - 2 pass. NB #1180. (136) tubes @ 1" OD x 14' L. Shell diameter is 20". OAL - 17'. Type: BEM