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NFPA 820 - Partial Recirculation Clause Removed?

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EggyTheRam

Civil/Environmental
Sep 11, 2024
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Hi all,

Reviewing HVAC design for wastewater coarse screening facility. Consultant proposed 75% air recirculation in one of the unclassified rooms when design initiated in 2018 but we asked them to check feasibility to revise design to latest code. Looks like 2020 and 2024 have removed Clause 9.3.3. which allowed partial recirculation of up to 75% exhaust air. Didn't see any mention of the deletion in the frontend. I looked through and it doesn't seem to have been relocated or rephrased elsewhere (although I'm happy to be corrected on this) - any insight on why / when this was taken out?

Many thanks,

Eggy
 
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