Building Diagnostics-Blower Door Testing-Calculating a Home’s Volume

This article first appeared in the July/August 2022 issue of the Journal of Light Construction.   Strangely enough, they chose to put me on the cover.

A blower door is designed to measure the volume of air moving across the blower door fan at a specific pressure difference between inside and outside the home.  The volume of air measurement in the US is cubic feet per minute (CFM) and the pressure differential is measured in Pascals (50 Pascals is the standard for residential construction).  One of the more common metrics used to express air leakage in a home is air changes per hour (ACH).  The only way we can calculate that metric is by measuring a home’s volume.

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