the dustproof cabinet disclosed features a lattice framework in which a plurality of members are interconnected via their ends in sets of three , at least , by way of modular joints which , together with the members , create frames around the external openings of the lattice ; each opening is then enclosed closed by a dustproof panel . the joints exhibit ribs or channels which , together with similar ribs or channels incorporated into the members , provide each frame with the mounting for a seal that occupies the entire periphery of the relative frame and offers a frontal abutment to the panel covering the relative opening .