To limit the probability that contaminated air will infiltrate the building, which could lead to the inadequate control of contaminants, which could lead to their accumulation in excessive concentrations, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
To limit the probability that contaminated air will infiltrate the building when the exhaust fan is not in operation, which could lead to the inadequate control of contaminants, which could lead to their accumulation in excessive concentrations, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
To limit the probability that the inappropriate design of ventilating systems will lead to the spread of contaminants to other occupied parts of buildings, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
To limit the probability that the failure to remove air contaminants at their point of origin will lead to their accumulation in excessive concentrations, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
To limit the probability that the inappropriate design of ventilating systems will lead to dampness, which could lead to the contamination of system components, which could lead to the growth of mould and mildew, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.