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| Vanity
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A bathroom storage cabinet under the wash basin. |
| Vapor
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The gaseous form of any substance. |
| Vapor barrier
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A material with a high resistance to vapor movement, such as foil, plastic film, or specially coated paper, that is used to control condensation or prevent migration of moisture. |
| Vapor migration
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The natural movement of water vapor from regions of higher vapor pressure to regions of lower vapor pressure. |
| Vapor pressure
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The pressure at which a liquid and its vapor are in equilibrium at a definite temperature. |
| Vapor-tight luminaire
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A luminaire constructed so that a specified vapor or gas cannot enter its enclosure Ñ usually water vapor. |
| Vara
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A measurement or unit of length, usually 31 to 33 inches and predominantly South American or Spanish. |
| Variable
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Subject to change. |
| Variable air volume system (vav)
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A mechanical HVAC system capable of serving multiple zones which controls the temperature maintained in a zone by controlling the amount of heated or cooled air supplied to the zone. |
| Variable frequency drive (vfd)
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Electronic speed control for motors. |
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