Final answer:
Under normal operating conditions, electrical appliances such as refrigerators, dishwashers, washing machines, and dryers are not required to be vented.
Step-by-step explanation:
Under normal operating conditions, electrical appliances such as refrigerators, dishwashers, washing machines, and dryers are not required to be vented. These appliances do not produce combustion byproducts or harmful gases that need to be vented to the outside. Instead, they rely on internal fans or vents to circulate air within themselves or release steam.