Static Pressure Calculator
Calculate total external static pressure (TESP)
Why this tool matters
Solve the calculation or lookup now, then keep the answer attached to the installed base so it can support maintenance follow-up, warranty timing, equipment history, and replacement conversations later.
Next best step
Use the result in the field, then start a free AssureStep account when you want the context to stay visible after this visit.
Understanding Static Pressure
TESP (Total External Static Pressure) is the total resistance to airflow in your duct system.
Formula: TESP = Supply Pressure - Return Pressure (note: return is negative, so this adds the absolute values)
Target: Keep TESP below equipment rated pressure for optimal performance
High TESP causes: Reduced airflow, frozen coils, higher energy costs, equipment failure
TESP Guidelines
✓ Good (< 0.5" WC)
System operating efficiently within design specs
⚠ Marginal (0.5-0.8" WC)
Higher than ideal - check for restrictions
✗ High (> 0.8" WC)
Excessive - will cause airflow problems
✗ Critical (> 1.0" WC)
Equipment damage likely - immediate action needed
Track Static Pressure Over Time
AssureStep AssureStep gives you unlimited equipment tracking, revenue opportunity scanning, and A2L compliance monitoring when static pressure rises above safe levels before callbacks happen.