![]() Various types of doors are in use which may be classified on the basis of arrangement of shutters, method of constructions, principles of working operations and materials used. Another thumb rule used to determine the size of the window opening is for every 30 m3 inside volume there should be at least 1 m2 window opening. It is preferable to have at least two openings in two different walls. In hot and humid regions, the window area should be 15 to 20 per cent of the floor area. They are located at a height of 0.75 m to 0.90 m from the floor level. ![]() Windows are provided to give light and ventilation. Thumb rule height of door should be 1 m more than its width. Minimum sized doors are used for bath rooms and water closets. Larger doors may be provided at main entrance to the building to enhance the aesthetic view. In case of the residental buildings, the size of the door should not be less than 0.9 m × 2.0 m. The size of the door should be of such dimension as will facilitate the movement of the largest object likely to use the doors. Number of doors should be minimum possible. The function of a door is to give access to building and to different parts of the building and to deny the access whenever necessary.
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