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Filter Pressure Drop Calculator

Loaded filter drop vs the static budget.

Inputs

Inputs and assumptions

Measured or rated at system CFM.

Since last change.

0.03 clean home, 0.08+ pets/renovation.

Share of total 0.5 in. w.c. system budget.

Result

Budget headroom (in. w.c.)
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Estimated loaded drop (in. w.c.)
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What to check

  • Filter size and MERV
  • Months in service

Related calculators

Screening estimate only. Verify fuel prices, nameplate ratings, and installer quotes before making a decision.

Saved calculations

Keep the assumptions with the result.

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