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Almost all buildings, homes, and residential complexes must get a blower door test done by certified companies. Blower door test supports the ultimate system design and offers paybacks. It is important to get a blower door test in America. The State Energy Conservation and Construction Code set the minimum blower door test requirements for air-tightness in commercial and residential complexes.

Both the commercial and residential buildings must have a continuous air barrier to avoid air leakages through the building’s thermal envelope. 

  • Residential Buildings

Detached one or two-family buildings and multiple single-family buildings and R-2, R-3, and R-4 buildings with fewer stories must get a blower door test done by the United States’ certified company

  • Commercial Buildings

Any building that is not under the residential category mentioned above is eligible to get the blower door test done.      

Complying with the Code

In the blower door test, the companies check the air leakage rate, and it must not be greater than 0.40 CFM/ft2 at the pressure difference of 75 Pascal. However, the commercial buildings must meet the prescriptive requirements list or perform the building’s blower door test

The residential buildings must be tested and certified as not having any air leakage rate that exceeds three air changes per hour with the pressure difference of 0.2-inch wg at 50 Pa. There is no change in the International Energy Conservative Code related to the air barrier and blower door test requirements. Still, it is expected that the national ECCC will increase in the future. 

Significance of the Blower Door Test

The blower door test can help homeowners to identify the airtightness issues and this in turn:

  • Reduce the moisture condensation issues
  • Heighten the occupant’s comfort level by minimizing drafts caused by the air leakage
  • Reduce energy usages because of the air leakage