Gas Fitters Create in CertBox
Combustion Analysis Report
This report documents a flue-gas combustion analysis of a fuel-burning appliance — furnace, boiler, water heater or rooftop unit — recording oxygen, carbon monoxide, stack temperature, draft and efficiency readings, along with the safety checks needed to confirm the appliance is operating safely.
Manufacturer service instructions; CO action levels follow BPI/NCI industry guidance (ANSI/BPI-1200-S)Valid: Annual (12 months)
Sample Combustion Analysis certificate
Sample Combustion Analysis with fictional data. All personal details shown are fake.
What it covers
- Appliance identification and fuel type
- Oxygen (O2) and carbon dioxide (CO2)
- CO as-measured and air-free
- Stack temperature and draft
- Combustion efficiency
- Spillage, venting and heat exchanger checks
Who needs a Combustion Analysis?
HVAC/gas service technicians
Homeowners
Property managers
Home inspectors
Create your Combustion Analysis with CertBox
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Frequently asked questions about Combustion Analysis
What CO air-free reading is dangerous?
Industry guidance (BPI/NCI) treats CO air-free readings above about 100 ppm as needing prompt correction, and 400 ppm air-free (or a reading that is rising and unstable) as grounds for immediate shutdown. Always check the appliance manufacturer’s own instructions and local code as well.
What does "air-free" CO mean?
CO as-measured is the raw reading in the flue gas sample, which is diluted by excess air. CO air-free is a calculated value that removes the effect of that excess air, giving a reading that reflects the combustion process itself — it is normally higher than the as-measured figure and is the number used for safety thresholds.