Section 12 in Tamil Nadu Panchayats Building Rules, 1997
12. Ventilation.
- Every living room shall be provided with adequate windows and ventilators, for securing effective ventilation. In no case shall the total area of windows and ventilators of a room be less than l/5th of its floor area. Only ventilators or windows that connect directly with external air and about on an open space shall be deemed to ventilate the room provided that ventilator or window opening into an open verandah or other overhead covering, the width of which is not over 2.4 metres shall also be deemed to connect with external air.
