The air flow belongs a centrally importance on temperature distribution. Even if all other components - such like: air flow speed, air flow rate, heating power as well as temperature control - are optimal aligned together an inconsistent air guidance can affect the complete temperature distribution negatively. Whenever possible the heated air should be injected broad laminar within the heating cabinet from down to upwards.
For this purpose it is also necessary that the heating is arranged broad planar within a optimally dimensioned air duct. The fan turbine sucks the cold interior air from the upper cabinet area and then blows through the air duct - guided over the there arranged heating - into the lower cabinet area over the entire cabinet width. On larger heating cabinet therefore are more air-circulation fans are necessary.