Enclosure Integrity Test Calculator

Calculate enclosure integrity (door fan test) parameters for clean agent systems per NFPA 2001 Annex C

Input Parameters

Results

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Max Allowable Leak Area
in²
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Equiv. Leakage Ratio
cfm/ft²
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Concentration Decay Rate
%/min
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Pass/Fail Threshold
Note: Door fan (blower door) testing is required per NFPA 2001 to verify enclosure integrity before clean agent system installation. The test confirms agent will remain at effective concentration for the required hold time.

Reference

NFPA 2001 Annex C - Enclosure Integrity Door Fan Test (ISO 14520/NFPA 2001) Concentration must remain above minimum for hold time Decay Rate = (Cd - Cmin) / hold time Max Leak Area based on enclosure volume, height, and hold time Typical hold time: 10 minutes for most clean agent systems Sharp-edged orifice flow model for leakage estimation