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Valley:
The internal angle formed by the intersection of tow sloping roof planes.
Valve:
Device in a heating or plumbing system that controls the flow of a liquid or gas.
Vapor Barrier:
Any material used to prevent the passage of water vapor.
Vaporize:
To convert liquid into a gas, usually by application of heat.
Vault:
A continuous length of arched ceiling.
Vent:
Any outlet for air that protrudes through the roof deck such as a pipe or stack. Any device installed on the roof, gable or soffit for the purpose of ventilating the underside of the roof deck.
Ventilation:
The circulation of air in a room or building; a process of changing the air in a room by natural or artificial means.
Vent Pipe:
A small pipe that extends from plumbing fixtures to a vent stack in the roof, allowing sewer gases to escape to the outer air.
Vent Sleeve:
See Collar
Vent Stack:
Pipe that rids plumbing system of sewer gas and prevents pressure buildup in pipes.
Vestibule:
A small entrance hall to a building or room.
Vinyl:
A man-made plastic material.
Volt:
Unit of measurement denoting electrical pressure or potential (usually abbreviated V).
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