... Square fin tube & Fin economizer, is used in boilers, marine power, heat exchanger components Definition:H fin tube, also know as Doulbe H ... used in utility boilers, industrial boilers, marine power, such as the tail of heat exchanger components. Principle:H-economizer two rectangular fin ... be discused with customers' requirements.Welcome to contact us. Heat Exchanger Fin Tubing (H/double H fin tube)