Replacement Windows, Vinyl Padio Doors & Vinyl Siding    

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V

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

Vent:  The movable framework or sash in a window that is hinged or pivoted to swing open. Usually part of a casement window.

Vent-Lock:  Latch mechanism on the interior face of the sash which retains the window in a partially open position for ventilation.

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

Visible Light:  The portion of the electromagnetic spectrum that produces light that can be seen. Wavelengths range from 380 to 720 nanometers. The normal light that comes through windows.

Visible Transmittance (VT):  The percentage or fraction of the visible light spectrum (380 to 720 nanometers) weighted by the sensitivity of the eye, that is transmitted through the panes of glass of a window. The higher the number the higher the percentage of visible light transmitted through the window.