Sunrise product manufactures various types of industrial heating elements. This is an iso 9001-2000 accredited company. Tubular heater is a part of those products. Tubular heaters are made in s.S. - 304, s.S. -321 and incoloy sheathing to heat air and covered with m.S. And s.S finns. This heater is used in forced air duct, drying ovens, air conditioning systems etc.