Air Duct Repair in Aliso Viejo, CA

What air duct repair actually fixes

One bedroom never cools. The register hums but moves almost nothing. Gray streaking appears at the grille edge. Dust returns a week after cleaning. Those are leakage and airflow symptoms, not dirt symptoms. Cleaning will not solve any of them.

In the 1990s and 2000s tracts here, flex branch runs cross attic joists and get stepped on. Compressed flex chokes the run. Sagging flex adds length and friction. Boots pull loose at the ceiling and dump conditioned air into the attic, then draw attic dust and insulation fiber back into the supply. The single large central return makes it worse. High velocity plus filter bypass at the grille sends unfiltered air straight to the coil.

Older 1960s-70s homes have galvanized trunks with round takeoffs. The failure there is open seams and shedding fiberglass liner in the plenum. Coastal raised-foundation crawlspace runs get ground moisture and rodent damage. Condo and Laguna Woods closet furnaces have short runs but shared chases, so a leak in the return drop can pull garage or chase air.

Repair means re-strapping and re-supporting flex, replacing crushed sections, remaking boot connections with mastic and drawbands, and sealing the return drop. Honest limit: if the outer jacket is brittle and most branches have failed, patching one boot is wasted effort. Replace the run.