This is Basically a Heavy Duty Refractory insulated strip heater with locked on finns for fast transfer of heat to air as the surface contact area increases, also with this results in higher watt density. The finns also act as a cooling option in area where the temperature has to be precisely monitored. Features Finns act as a fast heat transfer and cooling process The option of GI, S.S.304 or S.S.316 finns Application In forced air ducts Blowers