|Minimum shutter width||400mm|
|Minimum shutter height||400mm|
|Maximum shutter width||2000mm|
|Maximum shutter height||1600mm|
|Reinforcement thickness||1.5mm in Outer Frame, 1.5mm in Sash|
|Glass thickness||5mm to 26mm|
The difference between these two comes down to operable panels. A double-hung window can open from top or bottom, whereas a single-hung window can only open one sash. Horizontal sliding windows are commonly referred to simply as sliding windows or slider windows.