Types of Windows

2-pane-double-hung-window2 panes – Double hung
4-pane-double-hung-with-grid4 panes – Double hung with grids; count 2 for each gridded pane
3-pane-double-hung-with-grid3 panes – count 2 for gridded pane, 1 for non-gridded
1-pane-transom-window1 pane – Transom window (typically above other window or door)
2-pane-slider-window2 panes – Sliders
1-pane-crank-window1 pane – Cranks
1-pane-picture-window1 pane – Picture window (larger than most)