Containment Air Balance

Required net negative CFM via Q = 2610 * A * sqrt(delta_P) and recommended NAM count.

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Formula and source

Orifice flow Q = 2610 × A × sqrt(ΔP) (cfm; A in ft², ΔP in inches WC). Recommended NAM count = required_negative_flow / per-NAM rated CFM.

Classical orifice-flow theory; constant 2610 from ASHRAE Fundamentals derivation. IICRC S520-2024 §12 for containment guidance.

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