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C406.2.2 Return Plenums

2017 FBC - Building, 6^th edition > C Florida Standard for Mitigation of Radon in Existing Buildings > C406 Space Conditioning and Ventilation Systems > C406.2 Air Distribution Systems > C406.2.2 Return Plenums

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If acceptable indoor radon concentrations are achieved in part by construction or modification of a return plenum, it shall be constructed with materials and closures which produce a continuous air barrier for the life of the building. Construction of the return plenum shall be done such that a continuous air barrier completely separates the plenum from adjacent building structures. If duct board is the primary air barrier, then the joints shall be sealed by fabric and mastic on the foil side of the board.

Related Code Sections

C406.2.2 Florida Standard for Mitigation of Radon in Existing Buildings, Return Plenums

If acceptable indoor radon concentrations are achieved in part by construction or modification of a return plenum, it shall be constructed ...

F307.2.2 Florida Standard for Passive Radon-Resistant New Residential Building Construction, Return Plenums and Ducts

Return air shall be separated from any floor that is in contact with the soil or a crawl space, by a plenum or duct fabricated in compliance ...

2017 FBC - Residential, 6^th edition > F Florida Standard for Passive Radon-Resistant New Residential Building Construction > F307 Space Conditioning Systems > F307.2 Air Distribution Systems > F307.2.2 Return Plenums and Ducts

C406 Florida Standard for Mitigation of Radon in Existing Buildings, Space Conditioning and Ventilation Systems

through which the condensate and refrigerant lines run shall not terminate in the air return plenum or duct. If a portion of the condensate pipe does ...

2017 FBC - Building, 6^th edition > C Florida Standard for Mitigation of Radon in Existing Buildings > C406 Space Conditioning and Ventilation Systems

601.5 Duct Systems, Balanced Return Air

or when ceiling spaces are used as return plenums and fire walls restrict air movement from one portion of the return plenum to another. Provisions shall ...

2014 FBC - Mechanical, 5^th edition > 6 Duct Systems > 601 General > 601.5 Balanced Return Air

601.6 Duct Systems, Balanced Return Air

or when ceiling spaces are used as return plenums and fire walls restrict air movement from one portion of the return plenum to another. Provisions shall ...

2017 FBC - Mechanical, 6^th edition > 6 Duct Systems > 601 General > 601.6 Balanced Return Air

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