No requirement under the IRC. FYI, ANSI Stds. allow up to 800ppm carbon monoxide from ranges. And you just thought it was the tryptophan in the turkey making you sleepy.

As previously stated, "when installed and operating properly"..... Tell me when you find that. These things have a horrible track record for CO production.

Failure to ventilate the kitchen can lead to what appears to be black soot all over the house. I'm gotten lab reports back that the black stuff is charred food particles stuck to soybean cooking oil. All because of no ventilation.

If they ventilate, then it should comply with ASHRAE 62.2 for MUA. Whoever sucks air out of a home is responsible for providing MUA to replace it. Otherwise, uncompensated exhaust fans can depressurize the home and backdraft atmospherically vented appliances. These fans don't always capture all the aerosolized byproducts of cooking but they are pretty good at backdrafting open fireplaces.

Bob

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Keep the fire in the fireplace.