Window Terminology: Window Terms Starting with "V"


The movable framework or sash in a glazed window that is hinged or pivoted to swing open.


Polyvinyl chloride material, which can be both rigid or flexible, used for window frames.

Visible Light

The portion of the electromagnetic spectrum that produces light that can be seen. Wavelengths range from 380 to 720 nanometers.

Visible Transmittance (VT)

The percentage or fraction of the visible spectrum (380 to 720 nanometers) weighted by the sensitivity of the eye, that is transmitted through the glazing.

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