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How is ACH50 measured?

Air Change per Hour at 50 Pa (ACH50) is calculated by multiplying CFM50 by 60 to get air flow per hour, and dividing the result by the volume of the building.

How do you calculate ACH50?

Air Change per Hour at 50 Pa (ACH50) is calculated by multiplying CFM50 by 60 to get air flow per hour, and dividing the result by the volume of the building. ACH50 tells us how many times per hour the entire volume of air in the building is replaced when the building envelope is subjected to a 50 Pascal pressure.

How do you test a door blower?

10 Steps for Conducting a Blower Door Test Confirm that all open-flame areas are extinguished and dampers are closed. ... Create an airflow path. ... Turn off any gas appliances. ... Mount the blower door into one of the exterior openings. ... Take an outdoor pressure reading. ... Turn on the fan and run the test. ... Inspect for leaks.

What is a good ACH rating?

The very best homes have an ACH score below 1 ACH, and ultra-efficient homes are in the range of 0.2-0.6 ACH. If you are looking into buying a home, and want one that is air-tight, then ask your builder about the ACH score and what their homes typically score.

What are good numbers for a blower door test?

CFM below 1250 indicates reasonably airtight home. CFM between 1300 to 3000 indicates a moderately leaky home. CFM over 3000 indicates a leaky home that would definitely benefit from sealing the leaks.

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