Sentence 9.32.3.7.(4)

Intent 1:

To limit the probability of the inadequate removal of vapours and pollutants present in bathrooms and water-closet rooms.

This is to limit the probability of the inadequate control of:

• airborne pollutants, or
• relative humidity, which could lead to condensation, which could lead to the generation of pollutants from biological growth or from materials that become unstable on wetting.

This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.

Intent 2:

To exempt bathrooms and water-closet rooms with an exhaust air intake from the requirement to install a supplemental exhaust fan, on the basis that the principal ventilation fan will extract humidity and airborne pollutants through its exhaust air intake.