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For indoor combustion air, the volumes of spaces in different stories shall be considered as ___________________________ where connected by openings in doors or floors having a total free area of 2 square inches per 1,000 Btu/h of total input rating of all appliances

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Final answer:

The volumes of spaces in different stories in indoor combustion air should be considered interconnected when connected by openings in doors or floors with a specific total free area requirement.

Step-by-step explanation:

In the context of indoor combustion air, the volumes of spaces in different stories should be considered interconnected when connected by openings in doors or floors. These openings should have a total free area of 2 square inches per 1,000 Btu/h of the total input rating of all appliances. This requirement ensures proper ventilation and air circulation for combustion purposes.

User Michael Dougan
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