Air duct testing is the process of pressurizing the air conditioning system to find the total amount of leakage throughout. In order to complete the air duct test a certified person must cover all registers (vents) and connect a duct blaster (tool used for procedure) to the return air (filter). The test results are calculated by verifying and dividing the total CFM loss with the amount of forced air the HVAC system can produce. After a short period of time the technician will have the results of the test.
The State of California requires all installers to
hire a HERS Rater as a third party inspector to verify the specified leakage rate for every installation. While the State of California recognizes the importance of this test, many installers choose to ignore air duct testing to help offset their installation costs. By choosing to skip air leakage tests, installers are victimising the homeowner and the State of California.