... ) Welded Joints less (5) Stability H fin tube, known as Square fin tube & H Finned economizer, finned tube, is used in ... components. Principle:H-economizer two rectangular fin, similar to a square, its edge length for the fluorescent tubes of 2-fold ... good thermal conductivity. H-economizer can also manufacture dual tube "double H" type fin tubes, its rigid structure, and can be applied ...