Fresh Air Supply Testing
Trusted since 1999 · Proven delivery partner
Fresh air supply testing verifies that your building receives adequate outdoor air to dilute indoor pollutants and maintain healthy CO₂ levels. Green Air Monitoring measures fresh air provision against Building Regulations Part F and CIBSE Guide A requirements — identifying under-ventilated spaces before they cause complaints.
Why Fresh Air Matters
Fresh air dilutes CO₂, VOCs, particulates, and bioeffluents generated by building occupants. Inadequate fresh air supply is the single most common cause of poor indoor air quality in commercial buildings.
- Building Regulations Part F requires minimum outdoor air provision
- CIBSE Guide A recommends 10 l/s per person for offices
- WELL v2 requires enhanced ventilation above code minimum
- Inadequate fresh air increases CO₂ above 1,000 ppm
- Low fresh air rates increase infection transmission risk
Testing Methods
We verify fresh air supply through direct airflow measurement at outdoor air intakes, CO₂ decay testing (tracer gas equivalent), comparison of indoor/outdoor CO₂ concentrations, and review of BMS damper positions and control strategies. These methods quantify the actual fresh air provision versus design intent.
Common Problems
Fresh air supply failures typically result from economy dampers stuck closed or partially closed, CO₂ sensors not calibrated or positioned incorrectly, minimum fresh air damper settings overridden, and recirculation ratios set too high during energy-saving modes.
Frequently Asked Questions
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Get a no-obligation quote. We provide IAQ testing, ventilation assessment and environmental monitoring across London and the South East.