Intent 1:
To limit the probability that the performance of
heating-season mechanical ventilation systems will fall significantly
below expectations.
This is to limit the probability
of:
- inadequate ventilation, or
- the inadequate control of relative humidity.
This is to limit the probability of the inadequate control
of:
- indoor air temperatures,
- airborne pollutants,
- oxygen and other components necessary for breathable
air, or
- 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,
or
- the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
Intent 2:
[Clause 9.32.3.3.(1)(b)] To direct Code users:
- for dwelling units with forced air heating systems,
to provisions regarding the introduction of outdoor air stated in Article 9.32.3.4.,
- for dwelling units without forced air heating systems,
to provisions regarding the introduction of outdoor air stated in Article 9.32.3.5., or
- for dwelling units meeting certain conditions such that
depressurization does not present a hazard to occupants, to Article 9.32.3.6., which permits exhaust-only ventilation systems.