| 摘要 |
<p>The enclosure comprises a muffle (1) provided with at least one top heating element (30, 31), at least one bottom heating element (20, 21), an air circulation turbine (8) positioned in the rear wall (4) of the muffle (1), a diffuser plate (11) directing the air pulsed into the muffle, a heating element (10) ventilated by the turbine (8) and an electric switching device comprising contacts for the selective application of voltage to the heating elements and to the turbine, characterised in that the switching device comprises a position according to which at least one top heating element, at least one bottom heating element and the air circulation turbine alone have voltage applied to them in parallel to one another, the ventilated heating element not having voltage applied. <IMAGE></p> |
