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A door is a hinged or otherwise movable barrier that allows Entry and Egress into an \u201cenclosure\u201d. The opening in the wall can be referred to as a \u201cportal\u201d. A door\u2019s essential and primary purpose is to provide Cleaniness , Controlled Enviroment &\u00a0 security by controlling access to the portal (doorway). Conventionally, it is a panel that fits into the portal of a building, room, or vehicle. Doors are generally made of a material suited to the task of which it is to perform. Doors are commonly attached by hinges within the portal but can be moved by other means such as slides or counterbalancing.<\/p>\n
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