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Mistake & recovery · #166

Overlooking external static pressure when selecting a replacement fan for a retrofit

4th YearDuct Systems

For any fan replacement, measure the actual system static pressure under operating conditions before specifying the replacement. Using the original design…

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For any fan replacement, measure the actual system static pressure under operating conditions before specifying the replacement. Using the original design ESP ignores accumulated duct leakage, filter loading, and system modifications that change the real operating point.

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Can you verify this before I keep going? I’m looking at: Overlooking external static pressure when selecting a replacement fan for a retrofit. What’s the approved correction for this job?

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Do not hide, force, cover, or “make it work” if this affects safety, access, airflow, rated assemblies, supports, equipment, or inspection. Stop and verify the approved correction.

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