Plenums
Baltimore City Code, Building Codes, Part V, Section 602
in effectSection 602. Plenums
602.1 to 602.2 {As in IMC}
602.3 Stud cavity and joist space plenums. {As in IMC}
1. - 6. {As in IMC}
7. Stud wall cavities and spaces between solid floor joists abutting garage walls may not be utilized as air plenums.
602.4 Flood hazard areas.
For structures in a flood hazard area, plenum spaces must be located above the elevation required by the Floodplain Management Code for electric, plumbing, and mechanical systems and their attendant components and equipment or designed and constructed to prevent water from entering or accumulating within the plenum spaces during floods up to that elevation, if allowed by the requirements of the Floodplain Management Code.
Source: City of Baltimore Department of Legislative Reference, City of Baltimore Law Library (codes.baltimorecity.gov; Open Law Library bulk XML)URL: https://codes.baltimorecity.gov/us/md/cities/baltimore/code/building-codes/V/602Fetched: 10/25/2026