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Stud wall cavities and the space between floor joists can be used as plenums, under several conditions: These spaces can not be used for supply air. These spaces must not be part of a fire-resistance assembly. These spaces must not convey air from more than one floor level of a house. These spaces must be isolated from adjacent concealed spaces with fireblocking. These spaces in the outside walls of a house must not be used as air plenums.

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1. Stud wall cavities and the space between floor joists can be used as plenums, under several conditions: These spaces can not be used for supply air. These spaces must not be part of a fire-resistance assembly. These spaces must not convey air from more than one floor level of a house. These spaces must be isolated from adjacent concealed spaces with fireblocking. These spaces in the outside walls of a house must not be used as air plenums.





 
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