Abstract: The present invention relates to the construction of an enclosure, the cell defined thereby comprising:a floor which comprises on its peripheral edge an upwardly open border for interlocking,a ceiling which comprises a peripheral vertical flange,pillars which are disposed between the floor and the ceiling to constitute therewith a framework defining support frames determining by their succession the periphery of the framework,panels which are fitted in the border of the floor and are each removably fixed on the corresponding support frame,and O-rings which are interposed between said constructive elements.The invention is more particularly applicable to baking ovens.