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Florida’s Blower Door Testing Requirement

What to know about Florida’s Blower Door testing requirement for building code
As of July 1st, 2017, all new residential homes in Florida must pass a Blower Door (also known as House Infiltration) test to meet energy code. In order to help owner-builders and contractors in this transition, here is a list of the most frequently asked questions regarding Florida’s Blower Door test mandate.

1) Where are the Blower Door testing requirements located?

4) How long does the test take to complete?

Section 402.4.1.2 of the Florida Building Code, 5th Edition 2014 Energy Conservation
Testing takes approximately 45 minutes to complete after set-up.

5) When should the test be performed?

2) What is the specific requirement?

Once the house is complete, all weather-stripping is installed, the home has power, water, and no holes in the walls.
Each home must have 7 air changes per hour (7 ACH50) or less in order to pass the Blower Door test.

The Blower Door test simulates the following: If a home has wind blowing against it at 20 miles per hour, the total volume of air within the house would exchange with outside air 7 times.  The 20mph wind is equivalent to 50 Pascals (Pa) pressure difference that is simulated using the Blower Door Fan during the test.  All homes are tested at 50 Pa pressure difference to allow for comparisons to be made between homes/structures, no matter the size or plan type.

6) How do I receive the results/what do I do with the results/ what paperwork do I provide to the Building Official?

The provider typically leaves the results on-site for the builder, but some providers can also provide the results electronically.

3) Is the Blower Door test difficult to pass?

7) What does the Blower Door test tell you?

If the home meets the air sealing requirements found in table R402.4.1.1 passing the test is easy.Now that Blower Door testing is set at 7ACH it should be easy to pass first time.

The Blower Door test measures how leaky or drafty a home will be, which can contribute to homeowner discomfort. Also,the tighter a house is, the better control we can have over pollutants that enter the house.