On balcony doors and room windows, special fittings are installed - a structure made of metal elements of a swing-out or swing-type type. Due to these details, movable sashes and doors can be opened completely wide open or in a stationary position pulled out from above keeping the lower part of the sash leaning against the frame. The depth of such tilting is regulated by special "scissors" with limited travel. Most often, to open the sash or balcony door, it will be necessary to overcome the resistance created by the seal. If other malfunctions occur that are difficult even to diagnose or determine by the behavior of the window mechanism, you need to contact the professionals.