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Gas Appliances - CO Sensors

Voluntary Standard(s)

ANSI Z21.47-2016/ CSA 2.3-2016)

Gas-Fired Central Furnaces


ANSI Z21.13-2017/ CSA 4.9-2017

Gas-Fired Low Pressure Steam and Hot Water Boilers


ANSI Z21.86-2016/ CSA2.32-2016

Vented Gas-Fired Space Heating Appliances


Evaluation of the Durability and Longevity of Chemicals Sensors Used In-Situ for Carbon Monoxide Safety Shutdown of Gas Furnaces, September 2012

Relevant Rulemaking

The Commission published an ANPR for Performance Requirements for Residential Gas Furnaces and Boilers, in the Federal Register on August 19, 2019 (84 FR 42847).


To work with technical committees on revising the voluntary standards to strengthen safety provisions addressing hazards associated with carbon monoxide risks due to failure modes, such as disconnected vents and partially blocked vents.

Report an unsafe product