Get current pricing for Doyle & Roth, 125 Sq.Ft. Doyle & R Doyle & Roth Model Vt1661-3ve 125 Square Foot Vertical Heat Exchanger. Hastelloy C276 Tubes Rated 150 Psi/full Vacuum @ 347 Deg. F. 316l Stainles . Product Category: Process Equipment, Sub Category: Process Heat Exchangers: