Section 49(3) in Kerala Municipality Building Rules, 1999
(3)Windows and ventilators which open into a verandah shall be deemed to communicate with the external air, if such verandah is not more than 3 metres wide and open throughout its entire length into an open space open to the sky the width of such open space being not less than 3.0 metres. Trellising, mesh, grill or net may, however, be provided on the open side of the verandah;
