Who said anything about a the Mechanical Contractor testing his own work> The topic was: A state licensed mechanical contractor is NOT required to take any further classes or tests to perform duct leakage test. A licensed mechanical contractor is the highest rated license in the field of HVAC. But a certified test is a certified test regardless of who does repairs. I don’t know of many licensed mechanical contractors that would put their license at risk for a mere $400.00. Maybe a ham & egg A/C guy would but not CMC, for the CMC is the hardest license to get and to keep.
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