A fixture- and/or adapter-element (6) which can be used in combination with a small electrical appliance (5) by using a pre-fabricated housing of the electrical appliance (5). An adapter element (6) has a frame structure mainly angled at 45 deg. to the surfaces of the surrounding walls (3,4), and has a recess (A) in which the frame structure (8) in its installation position forms a closed surface to the surfaces of the walls (3,4) and through the corners (2) of the wall surfaces.
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