7.6 Ventilation shaft

A ventilation shaft shall be provided for toilet, kitchen and store room that do not have adequate direct access to natural ventilation from an external open space.
The size of such ventilation shaft shall be as follows:

7.6.1 1.5 sq.m in area with a minimum width of 1.0m for building up to 2 floors.
7.6.2 2.8 sq.m in area with a minimum width of 1.2m for building of 3 and 4 floors: and
7.6.3 4.0 sq.m in area with a minimum width of 1.5m for building of 5 and 6 floors including basement floors.

All shafts shall be accessible from ground floor with minimum opening size of 900x2000mm height.