If the gases never leave the house then they cannot be called "exhaust" .I think some standards cmtes. need to get their collective heads out of their butts and quit mincing words. With regards to clothes dryers, regardless whether electric or gas, you don't want to dump moisture back into the home-period. With gas, you want it to exhaust "bad stuff" to the outdoors.

Stoves, whether electric or gas, cause aerosolized moisture and fat droplets that should be exhausted to the outdoors. Boggles my mind you can install a gas range with the option of an exhaust hood. Optional to install the hood and optional to operate it. There is no safety interlock with the gas control. If you wanted it to make sense, the sequence should be to turn on the stove or range, the exhaust fan is actuated. When a vacuum switch proves draft, the ignition circuit is closed to the gas control allowing the burner to ignite. A high limit spill switch stands guard should be vent become blocked or the unit does not exhaust sufficiently. Ideally, it would be a gas direct vent oven.

Recirculating fans should be banned.

An you just thought it was the tryptophan in the turkey making everyone sleepy at Thanksgiving.

Next thing you know, they'll be putting draft hoods on top of water heaters. Oops!---too late. No wonder the world is crazy. We are living in pollution.

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disgusted with some people on this forum. Out of here!