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// CODE SNIPPET

C406.2.2 Return Plenums

2020 FBC - Building, 7^th edition > C Florida Standard for Mitigation of Radon in Existing Buildings > C4 Structural Sealing and HVAC System Balancing > 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.

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