Window Terms Glossary

Vapor barrier: A watertight material used to prevent the passage of moisture into or through floors, walls and ceilings.

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

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Vinyl-clad window: A window with exterior wood parts covered with extruded vinyl.

Venting unit: A window or door unit that opens or operates.

Visible transmittance (VT). Measures the amount of visible light that is transmitted through the glass.