What is a Blower door air tightness test ?
We set up a big fan in one of the exterior doors, and seal the door so its air tight. We then depressurize the home (suck all the air out of the home). This causes negative pressure – When the air leaves the home, air from outside finds its way into the home, through all the natural air leakage points (around windows, doors, fireplaces, attic hatches, wiring, light switches and receptacles).
We then can walk around the home and identify all the air leakage points in the home. After the test is done, we will now your ACH (air changes per hour).