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9.33.6.14.(7) | Application | Intent |
| OH1 | OS3 |
| Objective | OH1 Indoor Conditions |
| Attribution | |
| Application | Application 1: Design of return-air systems, in air duct distribution
systems serving heating systems in which the rated heat input does not exceed 120
kW and serving only one dwelling unit,
in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]. |
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| Intent | Intent 1: To limit the probability that combustion products will be
extracted from openings in furnace fire chambers or flue pipes and enter return-air
and supply ducts, which could lead to negative effects on the air quality
of indoor spaces, which could lead to harm to persons. |
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