Section 447(5) in The Orissa Municipal Corporation Act, 2003
(5)In addition to any means of ventilation required by any bye-law made under this Act, every such building intended to be used as a dwelling shall be so constructed that the whole or at least one side of every room thereof shall either be an external wall or abut on an interior open space and-(a)in case of external wall, except where it faces a street of not less than fifteen feet in width, it shall have between it and the boundary line of the owner's premises an open space, extending throughout the entire length of such wall, at least two feet wide or, in the case of a chawl or building intended to form a range of separate rooms for lodgers at least five feet wide; and(b)in case of interior open space, it shall have an area equal to not less than one-tenth of the aggregate floor-area of all the rooms abutting thereon and shall not be in any direction less than six feet across :Provided that every open space, whether exterior or interior required by this Sub-section, shall be and be kept free from any structure thereon and open to the sky, and shall be kept open to access from each end thereof.
