Why we often recommend replacing contaminated ductwork instead of cleaning it.
Lake Forest's 1970s-80s duct-board era material is porous by design — once contaminated, replacement is the honest answer, not cleaning theater.
Newer, tighter homes here mean indoor air quality depends more on your filtration and ventilation strategy, since less outside air exchanges passively through the building envelope.
See our full Duct Replacement (Not Just Cleaning) service page, or browse all HVAC services in Lake Forest.