Why is it important to take pre-test baseline readings?

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Categories: Blower Door FAQs

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Because differences in air temperature between indoors and outdoors create changes in house pressures, we need to measure and adjust for this baseline stack effect pressure during a Blower Door test. Failure to account for a baseline stack effect pressure of –2.5 Pa would cause an underestimation of the house leakage measurement (CFM50) by about 3%.