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9.33.6.13.(1)
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Placement of return-air inlets, 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 of an inadequate supply of make-up air, which could lead to negative pressure in a fire chamber, which could lead to the flow of combustion products into the air distribution system, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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