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Similarly, do electric stoves need to be vented?
You don't, generally speaking. An electric stove, for example, doesn't need ventilation. It is nice to have a range hood, because it will take strong smells, water vapor, grease and heat out of the air, thus improving the experience, though.
One may also ask, do range hoods have to be vented outside?
Since they don't need to vent to your home's exterior and are ductless, you are not required to install them only where there is a duct. These hoods operate by filtering the air they suck in and then blowing it back out into the room, essentially using a recirculation process.
The answer is that the gas range top and oven burners have such a relatively low BTU input that they can be operated safely without venting. The answer is that the gas range top and oven burners have such a relatively low BTU input that they can be operated safely without venting.