Air Leakage ACH50 Blower Door Test Calculator

Convert blower door test results (CFM50) to ACH50 and natural air changes per hour (ACH natural). Estimate annual heating/cooling energy waste from infiltration.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
Advertisement

How It Works

Convert blower door test results (CFM50) to ACH50 and natural air changes per hour (ACH natural). Estimate annual heating/cooling energy waste from infiltration

Each component has a specific meaning:

  • Infiltration — The infiltration recorded for the patient or scenario being assessed.

Note: Interpret the ach50 air leakage result against the clinical thresholds and context described above.

How to Use

Enter the infiltration for the patient or scenario you are assessing. Convert blower door test results (CFM50) to ACH50 and natural air changes per hour (ACH natural). Estimate annual heating/cooling energy waste from infiltration. Use the ach50 air leakage result to inform your clinical assessment.

Related Calculators

Insulation Payback

Energy & Utilities

Home Energy Audit

Energy & Utilities

Duct Leakage Penalty

Energy & Utilities

Frequently Asked Questions