Intent 1:
To limit the probability that the outdoor air supply
flow will not be equal to the normal operating exhaust capacity of
the principal ventilation fan, which could lead to excessive depressurization,
which could lead to:
- the spillage of combustion products from fuel-burning
appliances that are susceptible to spillage, or
- the inadequate replacement of indoor air with outdoor
air.
This is to limit the probability of
the inadequate control of:
- airborne pollutants,
- oxygen and other components necessary for breathable
air,
- 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, or
- the entry of combustion products into living space.
This is to limit the probability of negative effects on
the air quality of indoor spaces, which could lead to harm to persons.