Vapor barrier: waterproof material used to prevent moisture from entering the home.

Venetian window: a square or rectangular window with a semi-circular section on top and smaller windows on each side. Also called a Palladian window.

Vent: a window sash that swings open for ventilation.

View sash: a picture window which has small panes mounted in muntins.

Vinyl: common name for Polyvinyl chloride, a plastic material used in window construction.

Vinyl-clad window: a window whose wooden frame is encapsulated in vinyl.

Visible transmittance (VT): the percentage of visible light that penetrates a tinted window.

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