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Duct Leakage · Rough & Final

Duct leakage testing

The test almost every HVAC permit in California needs. We pressurize the duct system, measure how much air escapes, and tell you on site whether it passed.

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DG-1000 gauge hung on a stud reading 24.9 Pa and 52 CFM during a rough duct test

How the test works

We seal every supply register and the return, connect a calibrated fan to the system, and bring the ducts up to the test pressure. The airflow the fan has to supply to hold that pressure is the leakage. The manometer shows the reading live, and that reading is what goes on the report.

A single system is usually under an hour on site. Houses with several systems take longer, and we give you a realistic window when we book.

Rough or final

A rough test happens while the ducts are exposed. If something is leaking, the connection is still in reach and the fix costs a roll of mastic and twenty minutes. A final test happens once the system is complete and running.

New construction usually needs both. On a change-out the existing ducts are tested at final, which is where most surprises show up, because nobody has looked at those connections in decades.

If it fails

You hear it from us on site, with the number and how far it is from the limit. When we can see where the air is going we show you. Your installer seals it, we come back and retest, and nothing gets registered until it passes.

How it works

  1. 1Tell us about the job

    Address, scope, and where you are in the permit. Two minutes by phone or text.

  2. 2We schedule around your build

    Rough and QII while the framing is open, final once the system runs.

  3. 3Testing on site

    Calibrated equipment and a straight answer on the spot.

  4. 4Report and registration

    Report plus the signed CHEERS certificate, the same day.

Common questions

How long does a duct leakage test take?

A single system is usually under an hour on site.

Does someone need to be there?

Someone needs to let us in and the system needs to be accessible. Many contractors just give us a lockbox code.

What happens after a failed test?

We tell you on site what missed and by how much. After the fix we retest, and the certificate is filed only once it passes.

Other tests we run

ECC TestingECC field verification in Los Angeles, formerly HERS testing. Title 24 TestingTitle 24 field verification for LA permits. AC Change-Out TestingReplacing an AC, furnace or heat pump in Los Angeles? The permit needs HERS / ECC verification. ADU TestingECC / HERS testing for ADUs and garage conversions in Los Angeles.

Where we work

Full service areaThe San Fernando Valley and the rest of LA County. EncinoEncino is home base for us, so it is the area we can usually reach the fastest. Sherman OaksSherman Oaks is a few minutes from us, and a lot of our work is there: change-outs in older homes, remodels in the hills, and ADUs behind houses on the flats.. Studio CityStudio City jobs tend to be remodels and additions on older homes, and the testing has to fit around a crew that is already mid-project. Woodland HillsWoodland Hills sits at the hot west end of the Valley, where summer afternoons push air conditioning harder than almost anywhere else in LA. Van NuysVan Nuys is a mix of postwar single-family streets and small apartment buildings, and both show up on our schedule.

Need a test scheduled?

Call or text with the address and where you are in the permit. We will come back with a time and a price.

Call (310) 867-5591 WhatsApp ecctesting26@gmail.com