Cam lock: a type of lock used to lock the sashes to prevent entry from the outside

Casement windows: a window that swings on vertical hinges mounted on one side of the sash. A casement can be mounted to swing either inward or outward.

Center hung sash: a sash mounted on pivot pins located at the center of each side. This allows easy cleaning from the inside.

Clerestory: A window mounted high in the wall of a high-ceilinged room. This allows light into the center of the room.

Condensation resistance factor (CRF): a measure of the window’s resistance to condensation. The higher the number, the better the resistance.

Colonial windows: windows, usually single or double hung, having a number of small rectangular panes or lights. They are usually designated as 9-lite, 12-lite, etc., meaning the total number of panes.

Conduction: the means by which energy is transferred between materials in direct contact.

Convection: The transfer of energy via the circulation of air currents between surfaces.

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