Air Duct Mold Removal in Irvine, CA

What mold removal in ducts actually involves

Irvine's marine layer does most of the damage here. Coastal tracts with slab-level returns and attic air handlers see it worst. Warm attic air meets a cold flex run with compressed insulation. The liner sweats. Dust already sitting on that liner becomes food. That is the mechanism. The duct itself is rarely the problem.

So the first look is not the ducts. It is the condensate pan and coil face, plus plenum seams. A pan that backs up feeds the supply side continuously. Clean the branches and leave that, and the smell returns. Mildew odor strongest in the first minutes of a cycle usually points at the coil, not the registers.

Porous material changes the plan. Sheet metal trunks brush clean down to bare metal. Fiber-lined plenums and ductboard do not. Growth sits inside the fiber, and scrubbing just sheds it. Those sections get replaced. Torn flex gets replaced too, not taped.

Method is negative-pressure source removal with the system under suction, boots and registers pulled and washed separately, collars resealed where they leak into the attic.

Honest limit: if the attic run is soaked from a roof leak or a rodent-chewed section is wet, duct cleaning is premature. Dry the cause first.