Section 54(3) in The Haryana New Mandi Townships Building Rules, 1967
(3)Every basement storey shall have, except in the case of safe deposit vaults and strong rooms, which shall be provided with artificial system of ventilation, one or more windows opening directly into external air, or an area equal to at least 1/10th of the floor area and such windows shall be so located that half at least of such window can be opened and the opening in each case extends to the top of the windows.
