Blower Door Test Diagram

The higher outside air pressure then flows in through all unsealed cracks and openings.

Blower door test diagram.

A blower door is a powerful fan that mounts into the frame of an exterior door. A powerful fan is mounted in a temporary airtight frame of an exterior door. It can also be used to measure airflow between building zones to test ductwork airtightness and to help physically locate air leakage sites in the building envelope. The auditors may use a smoke pencil to detect air leaks.

Thermal image scan using a forward looking infrared camera flir a powerful tool in the energy auditors hands is the flir or forward looking infrared camera. The fan pulls air out of the house lowering the air pressure inside. Blower door system mechanics. You can use it to 1 find air infiltration leaks into your house 2 trace your progress in sealing the house 3 estimate your infiltration flow at 50 pa a blower door standard and compare it to other homes 4 estimate your heat loss due to infiltration and 5 estimate fuel saving and co2 reduction from air.

This diagram illustrates how we eliminate air leaks in the home click to enlarge. This process will cause outside air to be drawn into the house through leakage points. Understanding blower door test results. 1 a calibrated variable speed fan capable of inducing a range of airflows sufficient to.

To conduct a blower door test an infiltrometer or blower door fan is placed in the main entry doorway to depressurize the house or suck out air from the interior. Cruise 50 fan speed controller the cruise 50 box can be unchecked by left clicking on the box if you would like manual control of the house pressure. The movable tab on the fan speed controller slide bar now becomes active to adjust the. Simply put a blower door is a diagnostic tool used to measure how much air infiltration air leakage occurs in a house.

Last year we built an energy star home for a customer and we used a blower door test to evaluate the houses air infiltration performance. These pages describes how to build a pretty good blower door for about 30. Multi family buildings present a more significant challenge since a typical blower door test will measure leakage to the adjacent spaces as well as leakage to the outside. A blower door is a machine used to measure the airtightness of buildings.

There are three primary components to a blower door. This blower door test will also measure the quality of the indoor air and any moisture or condensation problems. Performing a blower door test to determine building envelope tightness is fairly straightforward for a single family home. The combined effort tightening building envelopes and installing mechanical ventilation can help resolve these issues and be verified by a blower door test.