Window Glossary

Small honeycomb spaces within the sash and frame which help to insulate and strengthen the window.

The amount of the air that passes between a window sash and frame. In windows it is measured in terms of cubic feet or air per minute, per square foot of area. The lower the number, the less air the window lets pass through.

Latch Mechanism in the interior face of the sash. That retains the window in a partially open position for ventilation.

A sloped extension from the frame that adds an aesthetically-pleasing dimension to the exterior of the window.

Geometric windows of various shapes and styles.

An odorless, colorless,tasteless, nontoxic gas which is six times denser than air. It can be used to replace air between the glass panes to reduce temperature transfer.

A top-hinged window that swings outward for ventilation.