General HVAC

Combustion Analysis

A diagnostic test that measures the efficiency and safety of your gas furnace by analyzing the composition of exhaust gases leaving the system.

What Is a Combustion Analysis?


A combustion analysis uses a specialized instrument inserted into the furnace flue to measure oxygen, carbon monoxide, carbon dioxide, stack temperature, and draft pressure in the exhaust gases. These readings tell the technician whether the furnace is burning fuel efficiently and safely. Proper combustion means complete fuel burning with minimal CO production. Poor combustion wastes fuel, produces excessive CO, and can create safety hazards.

Why It Matters for Your Home

Combustion analysis is one of the most important safety tests a furnace technician can perform, yet many skip it. It's the only way to verify your furnace isn't producing dangerous levels of carbon monoxide. A furnace can appear to work fine while silently producing unsafe CO levels that wouldn't be caught without instrumented testing. This should be part of every annual maintenance visit.

When was your last combustion safety test? Call Trademark Tek at 541-500-0663 to schedule one.

Related Terms


➜ Furnace

Quick Facts


General HVAC

Also Known As

Combustion Analysis