A fanlight window: a semi-circular window with radiating bars, usually located over a door or rectangular window.

Fiberglass: a composite of glass strengthening fibers in a plastic material. It is used in window construction, for strength, and roof or skylight panels, for light dispersion. See also, fiberglass windows.

A fixed light: a non-opening panel or window.

Flashing: a strip of metal or other material used to seal the perimeter of a window from water infiltration.

Frame: the fixed part of a window in which the sashes or casements are mounted.

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