How to calculate “Ventilation Shaft” size in a building?

Ventilation shaft:  For ventilating the spaces for water-closets and bath rooms, if not opening on to front, side, rear or interior open spaces, these shall open on to the ventilation shaft, the size of which shall not be less than the values given below:

NOTES:

1 For buildings of height above 30 m, a mechanical ventilation system shall be installed besides the provision of minimum ventilation shaft.

2 For fully air conditioned residential/business buildings, the ventilation shaft need not be  insisted upon, provided the air conditioning system works in

an uninterrupted manner, also, provided there is an alternative source of power supply.

(Source:NBC 2016)

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