Section 26(3)(c) in Punjab Urban Planning and Development Building Rules, 2018
(c)For mechanical ventilation in building shall be as per the provision of the National Building Code of India, 2016, as amended time to time.(iii)Outer courtyard/ open space. - The minimum width of the outer courtyard/ open space shall be not less than 2.4 m. If the width of the outer courtyard/ open space is less than 2.4 m, it shall not be treated as a outer courtyard/ open space and the provisions of outer courtyard/ open space shall not apply. However, if the depth of the outer courtyard/ open space is more than the width, the provisions of above sub rule (i) shall apply for the open spaces to be left between the building(s) when any habitable room depends on light and ventilation from such outer courtyard/ open space.