Los Angeles duct redesign and air balancing: what the audit measures before the quote
The buyer who books a duct redesign and air balancing audit in Los Angeles is usually past the brochure stage. They have a quote in hand, a comfort complaint that survived a previous repair, and a calendar that already absorbed two service visits. homeowners whose equipment runs but rooms still feel wrong The work starts by separating what the equipment can do from what the duct system will allow it to do. Those are different problems with different price tags.
Engineering scope: NEBB / TABB air balance tolerance: ±10% of design CFM at each register, ±5% at supply/return totals; Title 24 §150.0(m)11 new construction: total leakage ≤5% or ≤25 CFM per 100 sq ft conditioned floor area at 25 Pa; Flow hood airflow at every supply register, sum vs. blower table; identify under-delivered branches.
Los Angeles brings a specific comfort puzzle: Spanish homes, apartments, bungalow additions, ADUs, hillside rooms, and mixed-age duct systems. The health and comfort pressure is dense traffic corridors, older returns, renovation dust, pets, and bedrooms that sit far from the original trunk line. The install pressure is mixed electrical panels, LADBS permit sequencing, attic access, and rooms added after the first HVAC design. That combination is why Breathe LA 365 starts with room mapping instead of a generic equipment pitch. Los Angeles was outside both fire perimeters but downwind of the January 2025 events. Both the Palisades Fire and Eaton Fire occurred within Los Angeles County in January 2025, destroying roughly 16,000 structures combined. The City of Los Angeles itself was outside the fire perimeters but experienced multiple days of AirNow PM2.5 above 150 µg/m³, with smoke loading filters across the basin.