Blower Door Test Formation

The florida building code r402.4.2,5th edition (2014) energy 12909 conservation takes effect july 1, 2017 and requires that each newly construction residential dwelling pass a blower door test performed by an approved 3rd party before the co or certificate of occupancy is issued. Blower door test results are standardized for an air pressure difference of 50 pa; However, many testers, architects, builders and specifiers find that there is still much room for doubt

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Blower door test formation.

When the inside and outside temperature are different, the air flow leaving the building through the fan is actually different from the air. A blower door test is used on buildings in order to quantify the amount of air leakage through its enclosure. He will systematically move about your home setting up the house for the test.

For the blower door test, it is specified that the test must be undertaken to en13829 method a, and that the blower door reference volume, called vn50 in the phpp, is the full internal air volume of the building under test. During a blower door test, the interior air pressure needed to be maintained in order to gather useful data is 50 pascals, which is roughly equal to the pressure created when a. Blower door capability cdc uses a retrotec™ blower door with variable frequency drive (vfd) to pressurize large volume spaces or buildings to test for.

Testing done at the higher end of the range (between 40 and 60 pa) generally produces the most accurate results. The test requires a few parameters be set to yield accurate results. It is designed to check for air leaks in walls, attics, and mechanical penetrations.

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. In essence the test is done by setting up a blower door like the one above to depressurize the house to 50 pa (pascals) with respect to the outside. A temporary “blower door” equipped with a powerful fan is.

Blower door measurements are taken at higher pressures because these measurements are highly repeatable and are less subject to large variations due to changes in wind speed and direction. Once he is done with his walk through, your auditor will begin the test. This process will cause outside air to be drawn into the house through leakage points.

But what we really want to know is the air flow coming back into the building through air leaks. How do you pass a blower door test? The diffusion of or through building materials plays only a minor role.