What Is a Blower Door Test?

If you live in the State of New Jersey and you have recently done new construction or a home renovation the structure must comply with the Energy Subcode and that requires a blower door test. The latest bulletin from NJ is Bulletin 22-1 that was last updated in September 2022 with all the specification details in order to pass the blower door test. Besides for the house or building being more energy efficient the living space will be more comfortable since the air is not entering the home through windows cracks. After a blower door technician gives the test results, the contractor will submit proper documentation to show that the building complies with the energy code.
During a blower door test the fan is able to depressurize the home and air leaks can be easily identified. Try and imagine a homeowner investing money in renovating their home only to realize there are air leaks throughout the home. When looking for a blower door professional in New Jersey always be certain that the test is done by a company that is BPI (Building Analyst Professional) Certified to ensure that the test results are accepted by the New Jersey Energy Code.
Do The Blower Door Test Results Make Sense?

Assuming that you are using a blower door test company that is BPI Certified there could be an array of reasons for why homes and buildings fail a blower door test. The primary reason is due to plumbers, electricians, and duct installers not sealing their work properly. When running a PVC pipe from the attic through the home there is a cut for the pipe to fit through. In most cases the piping is not flush and there is a gap where air from the attic can get into the home. The correct way is after the plumber completes the installation of a PVC pipe through the home he should seal it with foam or caulk.
Not doing so, will result in air leaking into the conditioned space resulting in a potential blower door test fail. The same thing is with an electrician running wires or even installing spots. The installer should always clean up after their work and ensure a good seal with no air getting into the living area.