🥍 How Does A Blower Door Test Work

Zonal testing is the process of testing an area in a house to see if the space has a connection to the outside. Instead of looking for an individual air leak, the test checks a space or a room for all air leakage in the designated area. This speeds up the process for finding air leaks by pinpointing the rooms or areas with the biggest issues.

A blower door test uses a large fan mounted in an air tight canvas ‘door’ that is connected to a gauge (a manometer) that can measure the airflow through the fan as well as the pressure difference between inside and outside while the fan is running. This information is combined with the building enclosure area and volume to calculate

Infiltrometer™ Blower Door Test. All houses should have some air leakage but most leak too much. Symptoms of excessive leakage include uneven temperatures throughout the house, wasted energy, excessive dust, cold drafts, dry air in winter, and clammy air in summer. On the other hand, some homes are too airtight and may have unhealthy indoor air.

A blower door is just a big fan than sucks air out (depressurizes) or blows (pressurizes) air into a home at a set pressure. The most common way to set the blower door is for depressurization and is what we will assume for this section. The idea is that

^{Two different types of performance testing systems are used to measure duct leakage; a Duct Blaster® and a Blower Door. holes and cracks in the ductwork. The fan speed is increased until a standard test pressure is achieved in the duct system.}

How Does the Blower Door Test Work? The blower door test uses a powerful fan mounted into the frame of an exterior door. The fan then pulls air out of the building or residence, reducing inside air pressure. The outside air, which is at a higher pressure, then flows in through unsealed cracks and openings. The test determines the air

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how does a blower door test work