Sentence 9.33.6.13.(6)

Intent 1:

To limit the probability of connecting return ducts to rooms on multiple floor levels with different stack pressures, which could lead to an inadequate flow of return air from upper-level rooms, which could lead to an inability to regulate the flow of warm air to rooms, which could lead to:

• an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], or
• inadequate ventilation.

This is to limit the probability of:

• the inadequate control of airborne pollutants or relative humidity, or
• condensation.

This is to limit the probability of:

• the generation of pollutants from biological growth or from materials that become unstable on wetting, or
• the deterioration of building elements.

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.