... Double H fin tube, known as Square fin tube & Fin economizer, is used in boilers, marine power, heat ... , marine power, such as the tail of heat exchanger components. Principle:H-economizer two rectangular fin ... conductivity. H-economizer can also manufacture dual tube "double H" type fin tubes, its rigid structure, ... requirements.Welcome to contact us. Heat Exchanger Fin Tubing (H/double H fin tube)