This is a legacy version of the WELL Building Standard. Please check the latest version here.

Air infiltration management

Air infiltration management


To minimize air quality and thermal comfort issues resulting from the infiltration of untreated air through the building envelope.


Indoor air quality and thermal comfort can be compromised by leaks and gaps that break the building’s air barrier. These weak points are not only wasteful but can also lead to conditions conducive to growth of molds and the infiltration of pests or polluted air.

Part 1
Air Leakage Testing

The following is performed after substantial completion and prior to occupancy to ensure the structure is airtight:
Envelope commissioning in accordance with ASHRAE Guideline 0-2005 and the National Institute of Building Sciences (NIBS) Guideline 3-2012 (for new construction or structural renovation).
Detailed plan for action and remediation of unacceptable conditions.

Part 2
Leak Tests for Residences

One of the following methods is used to evaluate the building envelope:
Blower door testing.
Infrared thermography.
Hot-wire anemometer.