Drying Chamber Air Turnover

Actual ACH from air-mover and dehu CFM and gap to target ACH.

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Formula and source

ACH = ((air_movers_total_cfm + dehu_cfm) × 60) / chamber_volume_ft³. Target ACH set by drying class (Class 1 ≥ 6, Class 2-3 ≥ 8, Class 4 ≥ 10 per IICRC S500-2021 typical). Gap = target_ACH - actual_ACH.

IICRC S500-2021 §12 (Drying Process) by name.

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