J-channel: surrounds to outer frame of a window and covers the ends of siding that abuts the window.

Jalousie window: is comprised of thin horizontal panes that simultaneously pivot outward to open as a hand crank is turned.

Jamb: the vertical frame member on each side of the window. The top horizontal piece is called the head jamb.

Jamb depth: the width of the jamb member, measured from the outer wall to inner.

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