Folding doors (usi pliante pret in romanian language) are easy to install, present many advantages and can be ordered at reasonable prices. They function with a simple mechanism, but they still need regular maintenance, if you want them to work properly. You should start by cleaning them every couple of weeks. Use cleaning substance and also the vacuum. Keep an eye on doorknobs, on the rail, on hinges and rollers. Try to replace or tighten them if you see that they do not work properly. If the door has metal frames, remove any sign of rust immediately. It is an easy task for everybody, you just need to have the proper tools at hand: screwdriver, screws, paintbrush, wire brush, sandpaper, and superglue.