Harvia B1819 Instructions De Montage page 34

Instructions for installation and use
When assembling the upper wall elements, make sure that they are flush with
the connecting strips of the lower wall elements. Screw the upper wall elements
together with three 5 x 80 mm screws for each wall element.
Note that each upper wall element must be screwed to the protruding
strip of the lower wall element.
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