Door

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(4/6/2010)

A door is a moveable barrier used to cover an opening. Doors are widely used and are found in walls or partitions of a building, vehicles, and furniture such as cupboards, cages, and containers. A door can be opened to give access and closed more or less securely using a combination of latches and locks. Doors are nearly universal in buildings of all kinds, allowing passage between the inside and outside, and between internal rooms. When open, they admit ventilation and light. The door is used to control the physical atmosphere within a space by enclosing it, excluding air drafts, so that interiors may be more effectively heated or cooled. Doors are significant in preventing the spread of fire. They act as a barrier to noise.