The Anatomy of a Window:

The first thing to learn when looking into new or replacement windows are the major components that make up a window. Knowing these terms will make it easier on you, as a homeowner, speaking to contractors and window professionals about your project.

Window Parts You Should Know:

The Window Frame:
The fame includes the window’s entire outside edges, or the head (#1), jambs (#2), and sill (#3) combined. Window Diagram

1. Head
This is the top part of the window frame, going across from one side to another.

2. Jamb
They are the vertical portions of the window frame that make up its sides.

3. Sill
The sill is the lower equivalent of the head and protrudes from the wall slightly.

Window Interior
Includes the glass and the mechanisms within the window frame.

4. Pane
A single piece of glass separated by pieces of the window itself.

5. Glazing
Any glass within the entire construct of the window. Glazing is mounted on the surface of the window.

6. Sash
The sash is the movable part of a window made up of the vertical and horizontal frame that holds the glass.

7. Muntin Bar
A muntin bar creates a boundary between individual window panes.

Common Types of Windows Single and Double HungSingle-Hung and Double Hung Windows
- Sashes slide vertically
- In single-hung units, the bottom sash is the only sash that moves
- In double hung windows, the top and bottom sash move vertically
- Ventilation is regulated by widening vertical crack with bottom sash
- Screens are possible on exterior / interior Casement WindowCasement Windows
- Hinges are located on one side that swings window open
- Includes a crank-operated device for opening and closing the window
- Has lower air leakage rates due to a tighter seal than sliding windows
- Also has better ventilation since there is a larger area open to outside
- Can catch passing breezes because window protrudes outside into wind
- Screens are installed on interior of the window AwningAwning
- Awning windows are similar to casement windows but with hinges at the top
- Window opens outward
- Provide lower leakage rates due to tighter seal Bay WindowBay Window
- Bay windows are a combination of 3+ windows built to project outward from an outside wall
- The center window is made of one or more windows parallel with the wall
- The outer windows are angled back towards wall Bow WindowsBow Window
- Similar to bay window, more actual windows
- Radiate out to form semi-circle Fixed FrameFixed Frame
- Fixed frame windows are used mainly for adding exterior light to rooms
- They do not move or open
- Provides no ventilation SkylightSkylight
- A Skylight window is installed in ceiling parallel to the roof
- Some models can open and provide ventilation
- They bring in more sunlight than a traditional wall window SliderSlider
- Similar to single/double hung windows, but turned on their side
- Either one or both sashes will be able to move and/or slide
- Slider windows provide ventilation – opening is widened by the sashes