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30 Parts of a Window and Window Frame (Diagrams)

Detailed diagrams illustrating all the different parts of a window and window frame. Second illustrations is a cross section of a 3-pane window labeling all the different parts of the window including the frame.
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When you’re replacing windows, it’s nice to know all the different parts of the window and window frame.

That’s here these 2 diagrams come into play.  The first illustrates the anatomy of a window and frame.  The second showcases the anatomy of a cross-section of a three-pane window.

Diagram: Parts of a Window

Parts of a window and window frame diagram

Interior Casing: The finished trim or holdings around the window frames. They help prevent cold air from entering as well as add a finishing touch and enhance the overall look of the window.

Head: The horizontal part of the window frame.

Muntin: A bar or strip of wood or metal between adjacent panes of glass that create a grid or latticework appearance.

Sash Lock: The locking mechanism attached to a single-hung or double-hung window.

Upper Sash (Upper Panel): The upper part of the fixed or movable framework holding the pane of a window.

Side Jamb: The vertical parts that form the sides of a window frame.

Stile: Vertical members of the window frame.

Window Pane: A plate of glass within a window frame.

Lower Sash (Lower Panel): The lower part of the fixed or movable framework holding the pane of a window.

Channel: A groove around windows.

Exterior Sill: The external horizontal bottom part of the frame that protects from water intrusion and can be used as a decorative element.

Apron: The decorative raised section below the window sill.

Stool: The bottom horizontal shelf of the window attached to the window sill where the sash descends and where plants may be placed.

Bottom Rail: The lowest horizontal part of the window frame that connects its vertical parts.

Top Rail: The top horizontal part of the window frame.

Head Jamb: The vertical side on the the very top of a window frame where the window sash sits on.

Cross-Section Illustration of a Window

Cross section diagram of a window and window frame

Air Latch: Makes it possible to keep the window open regardless of the position you set it.

Aluminum Bracket: Brackets made of aluminium and part of a window bracket system that offsets the window from the wall by a few inches.

Glass Sealant: A silicone-based product that can take on the form of a liquid, gel or foam and applied to glass surfaces as a protective coating and to preserve its clean and dry exterior.

Hollow Glass: Window panes made of hollow glass.

Pane: A sheet of glass in a window.

Spacer: An insulating glass unit typically made of aluminium that’s sealed between two glass layers and keep glass panes apart.

Meeting Rail: The horizontal rail of a sash that meets the rail of the other sash when the window is closed.

Pulley: A simple machine with a wheel and a rope or chain used to lift heavy objects.

Sloped Sill: The exterior part of the window sill that is designed to be sloped downward to enable water to run off.

Drain Hole: A short channel where fluids can flow.

Lift Rail: A handle used to open and close a window that goes all the way across the sash.

Lower Sash: The lower part of the fixed or movable framework holding the pane of a window.

Glass Sealant: A silicone-based product that can take on the form of a liquid, gel or foam and applied to glass surfaces as a protective coating and to preserve its clean and dry exterior.

Bottom Rail: The lowest horizontal part of the window frame that connects its vertical parts.

Frame: The framework that makes up the window’s perimeter and supports the entire window system.

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