IECC 2018 Code went into effect July 1st, 2019. Are you code compliant?
Stay up to code & teach your contractors, HVAC installers, insulation installers, etc how to do the work done correctly the first time (properly seal duct systems, any openings, etc). Duct Envelope Tests are preferably preformed during rough-in, while systems, joist, etc. are still accessible & the problem areas can be quickly identified & addressed. You DO NOT want to fail this test right before occupancy.. because at that point, aero-sealing is your only option if you've me