TL;DR
A carbon monoxide test is the measurement of CO in an appliance's flue gases and in the surrounding room air using a calibrated combustion analyzer, performed during furnace and water heater service to verify the equipment burns cleanly and vents completely. Technicians read flue concentrations against benchmarks, with air-free readings under about 100 ppm considered acceptable for most appliances and rising numbers flagging cracked heat exchangers, blocked flues, fouled burners, or backdrafting.
What it means
A carbon monoxide test is the measurement of CO in an appliance's flue gases and in the surrounding room air using a calibrated combustion analyzer, performed during furnace and water heater service to verify the equipment burns cleanly and vents completely. Technicians read flue concentrations against benchmarks, with air-free readings under about 100 ppm considered acceptable for most appliances and rising numbers flagging cracked heat exchangers, blocked flues, fouled burners, or backdrafting. Ambient checks confirm living spaces stay near zero, since chronic low-level exposure causes symptoms physicians routinely misattribute.
Where it sits in the glossary
Carbon monoxide test is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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