... Double H / Square fin tube & Fin economizer, is used in boilers, marine power, heat exchanger components. Definition:H fin tube, also know as ... Doulbe H fin tube, H fin economizer, H fin tube economizer, H type finned tube, square fin tube.It is a kind of ... of heat exchanger components. Principle:H-economizer two rectangular fin, similar to a square, its edge length for the fluorescent tubes of ...