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A vapor barrier (or more accurately, vapor retarder) is any material, typically a plastic or foil sheet, that resists passage of moisture through wall, ceiling and floor assemblies of buildings.
Vapor barrier: A watertight material used to prevent the passage of moisture into or through floors, walls and ceilings.
Venting unit: A window or door unit that opens or operates.
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 See also: Floor, System, Ceiling, Door, Frame
  
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