- On Double-Hung windows, both the top and bottom sashes are operable: the bottom lifts up, the top pulls down. Double-Hungs offer beautiful sight lines and great air circulation.
- On Single-Hung windows, the bottom sash is operable and the top sash is fixed. Just raise the bottom sash for the ventilation you desire. Single-hungs are economical, easily serviceable, and allow for trouble-free access to dry wall materials during construction. They also provide exceptional energy efficiency.
- Oriel windows feature a smaller or shorter upper sash than lower sash (40/60 split). Reverse Oriel Windows contain a smaller or shorter lower sash than upper sash (60/40 split).