Doors: Installation, Maintenance * Operating Mechanism
Doors: Installation, Maintenance & Operating Mechanism *** Relevant Background on Doors: " A door is a hinged or otherwise movable barrier that allows ingress into and egress from an enclosure. The created opening in the wall is a doorway or portal . A door's essential and primary purpose is to provide security by controlling access to the doorway (portal). 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 door's task. Doors are commonly attached by hinges, but can move by other means, such as slides or counterbalancing... Doors may incorporate locking mechanisms to ensure that only some people can open them. Doors may have devices such as knockers or doorbells by which people outside announce their presence. Apart from providing access into and out of a space, do...