Finnend tubular heating elements are based on a RHK type heaters. The surface area is enlarged by a strip in order to heat gases. At a high power the surface temperature is small and the heating element is short.
|max. temperature at tube sheath
|700° (at CrNi-steel)
|diameters (with RHK 8,5mm)
|20 and 28 mm
|Distance between fins
Channel air heaters for air-conditioning and drying apparatus