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Occupant symptoms clear when away (SBS)

What is going on

Possible causes and checks for: occupant symptoms clear when away (sbs).

Likely causes

  • Ventilation deficiency (largest cause)
  • Poor temp/RH control
  • Maintenance
  • Chemicals
  • Noise

Check in this order

  1. Inspect intakes, blocked vents, fiberglass liners, exhaust re-entry, restroom/mold/chemical odors
  2. Questionnaire
  3. MERV 13, exhaust in baths/kitchens, 40–60% RH, 72–76°F

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Source: General HVAC service practice — verify per model. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.