Which type of appliances is exempt from the requirement to be vented?

Counter appliances are exempt from the requirement to be vented because they typically use sealed combustion systems or electric power, which do not produce combustion gases that need to be vented outside. These appliances, like countertop ovens, toaster ovens, and some electric skillets, function differently from gas-burning equipment. For example, gas stoves, water heaters, and furnaces generate combustion gases that can be harmful if not properly vented to the outside to ensure safety and air quality. Therefore, their exemption is based on the fact that they operate without the same combustion processes that require venting. This distinguishes counter appliances from others that could pose risks without proper ventilation.