HVAC Duct Cleaning in San Juan Capistrano, CA

Why San Juan Capistrano ducts load up with dust

Most of it starts at the return. Builder-grade filter grilles here are undersized for system airflow. Air takes the easy path around the filter edges. Platform returns framed into the attic are rarely sealed tight, so the blower pulls attic air through joints in the framing. That attic air carries hillside grading silica and fall smoke particulate. Insulation fiber mixes in too. It lands in the trunk, the flex, and the coil face.

Then geometry makes it worse. Flex duct sags between truss bays. Dust pools at every low point. Crushed radius elbows choke the last bedroom on a run. Duct tape at the boots dries out and lets go, usually within a decade.

Cleaning means source removal under negative air. We brush and agitate each supply and return run, not just vacuum the register. Plenum and coil get done too, or the coil reloads fast. Boots and collars are resealed with mastic afterward.

Marine-layer months bring surface mold at bathroom and north-facing supply boots. We sanitize only where growth is documented and visible. Near the beach, salt corrodes registers and metal collars from the inside out.

Pre-1975 homes sometimes have fiberglass duct board plenums. Aging binder sheds fiber. Aggressive brushing on deteriorated board makes it worse, so that plenum gets replaced instead of cleaned.