CFM50 & ACH50
CFM50 describes airflow at a 50-pascal pressure difference. ACH50 expresses that leakage relative to the tested building volume. We explain the measurements in the context of your home.
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● Building Performance ● Weatherization ● Energy Savings Modeling
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New York Energy Assessments
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Energy AssessmentsBook an assessment MenuBlower door testing.
Measure the leakage.
A little preparation.
Let’s find your
New YorkEnergy AssessmentsBook an assessment Menu
MEASURE · INVESTIGATE · VERIFY
Blower door testing.
Find the way forward.
Blower door testing helps measure air leakage and guide a closer investigation of the building enclosure. Discuss testing for your Westchester County or Bronx property.
KNOW WHAT COMES NEXT
A clear path through your project.
Confirm the scope, understand the findings, and decide on your next step with the information you need.
- 01
Confirm the testing scope
Discuss the property, access needs, test purpose, and any project documentation requirements.
- 02
Measure and investigate
Use the test to evaluate air leakage and investigate relevant areas under the agreed scope.
- 03
Review the results
Understand what the measurements mean, the limitations of the test, and practical next steps.
UNDERSTAND THE RESULTS
Measure the leakage.
Prioritize the improvements.
A blower door uses a calibrated fan in an exterior doorway to measure air leakage under a controlled pressure difference. The findings help guide further investigation and air sealing.
Locate priority areas
Investigate accessible leakage paths around attic bypasses, rim joists, doors, and other enclosure details. Thermal imaging can support the investigation when conditions are suitable.
Plan the next step
Use the findings to discuss targeted air sealing, insulation, and ventilation needs. Confirm the reporting scope and any before-and-after testing when planning improvements.
BEFORE WE VISIT
A little preparation.
A more useful conversation.
- Arrange access throughout the areas included in the test.
- Tell us about fireplaces and combustion equipment.
- Ask for preparation instructions before the appointment.
Does testing automatically identify every leak?
A leakage measurement and locating individual leaks are related but different tasks. Confirm how the inspection will investigate leakage locations.
Can testing be used after air sealing?
Discuss before-and-after testing when planning the project so the measurement conditions and documentation can be agreed in advance.
Is this the same as an energy audit?
Blower door testing is a diagnostic service that may be included in a broader assessment. Confirm which services you are booking.
START WITH YOUR HOME
Let’s find your
next step.
Tell us where you are and what you’d like to improve.
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