Exposure comes first
Use current Air Quality Index information and official health instructions during smoke. If indoor heat becomes unsafe, follow public guidance rather than sealing a home beyond safe conditions.
Smoke reading 14
After smoke: start with exposure reduction and filtration
Review exposure comes first, then connect the observation to its source, system location, and a written scope.
DIRECT ANSWER
Start with the condition, not the sales package
During wildfire smoke, official Bay Area and California guidance focuses first on reducing exposure, closing outside-air entry when appropriate, using compatible high-efficiency HVAC filtration, and operating a non-ozone-producing portable air cleaner. Duct cleaning is not listed as the automatic first response.
After the event, document persistent soot, ash, or odor and identify how smoke entered. A filter loaded with smoke particles, an outside-air intake, open windows, door leakage, or indoor combustion can be more relevant than adhered dust deep in the ducts. Never run an ozone generator to chase smoke odor in an occupied space.
READ THE AIR PATH
What deserves a closer look
Filter compatibility
MERV 13 or higher may help during smoke when the system can safely use it. Confirm fit, pressure limits, and operating settings with the equipment guidance or a qualified HVAC professional.
Post-event evidence
Look for visible deposits at the filter, return, equipment, and supplies. Persistent odor alone does not show that duct interiors are the main source.
USE THIS SEQUENCE
Move from observation to a written decision
Follow current smoke guidance
Check BAAQMD, AirNow, and local emergency information.
Inspect and replace filters as directed
Heavy smoke may shorten filter life.
Clean room sources safely
Address settled particles and outdoor entry paths before assuming a duct source.
Request targeted evaluation
Ask which component evidence supports any proposed post-smoke cleaning.
CALL PATH
Ask about the evidence and the written scope
Sunnyvale Airflow Guide is an independent lead-generation website, not an air duct cleaning company. Calls may connect you with an independent service provider. Service availability, qualifications, pricing, and terms must be confirmed directly with that provider.