System Q display cases are classified based on structural and functional characteristics. The first letter – Q for “quadrilateral” – is used for the entire system, and is followed by a second letter that has to do with the shape of the display case and the five product types.
- QD display cases have a door that can be opened and represent the evolution of the standard glass cabinet (D for Door).
- QB cases allow objects to be displayed in a mobile glass structure (B for Box).
- QT cases are table models that extend horizontally and allow objects to be seen mainly from above.
- QC models are display drawer cases, horizontal or vertical.
- Finally, QF models serve as “frame cases” for paintings (F for Frame).
Further, more detailed classification criteria depends on how the display case is placed in the museum (for example, as an island, wall or hanging unit); the opening mechanism (rotation, pull & slide or tilt & slide); the type of ceiling (in glass, in glass with metal frame or in metal) and any other potential special characteristics.