door

* The main function of a door in a building is to serve as a connecting

link between the internal parts and to allow free movement to the 

outside of the building.

* The various types of doors based on working are hinged doors,Swing doors,

Revolving doors,Sliding doors,Foldable or folded doors,Collapsible doors,Rolling 

shutters,Battened & Ledge Type,Framed & Paneled,Flushed door,etc.