Construction
Static Pressure Calculator
Add up filter, coil, duct, and register pressure drops. Should be at or below the equipment rated ESP.
Total ESP (in WC)
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- Margin
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- Sized OK?
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- CFM penalty
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FAQ
Why does static pressure matter? +
High static = low airflow = coils freeze, heat exchangers crack, blower motors burn out. The #1 silent killer of HVAC equipment.
Typical residential rated ESP? +
PSC motors: 0.5 in WC. ECM motors: 0.8-1.0 in WC. Variable-speed: up to 1.0+ in WC.