Casing with particle blocker

The housing (1) has a particle blocking device installed at through openings (7, 8) for locking the openings, where the openings are formed in respective housing parts. The blocking device includes slots that are positioned over the respective openings. The blocking device is formed as a sticker (10), where the slots are arranged at an angle of 90 degrees to each other to form cross shape. The sticker comprises adhesive at an outside extent region at lower surface. The openings are formed in intermediate bottom (2) of the housing to divide the housing into two regions (3, 4).