To limit the probability that the inappropriate design of heating, ventilating or air-conditioning systems will lead to the spread of products of combustion to other occupied parts of buildings, which could lead to negative effects on the air quality of indoor spaces and outdoor occupiable spaces, which could lead to harm to persons.
To limit the probability that the failure to remove air contaminants at their point of origin outdoors will lead to their accumulation in excessive concentrations, which could lead to negative effects on the air quality of indoor spaces and outdoor occupiable spaces, which could lead to harm to persons.