Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor? August 23, 2021March 2, 2019 by admin Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor? A. 5-10B. 15-20 C. 30-35 D. 35-40