Final answer:
High-efficiency furnaces are designed with a condensing heat exchanger and may have ribbon or slotted burners. They do not typically have a draft diverter or a natural draft heat exchanger.
Step-by-step explanation:
High-efficiency furnaces are designed with a condensing heat exchanger which allows the furnace to extract more heat from the combustion process by condensing water vapor from the exhaust gases. This increases the furnace's efficiency and reduces energy waste.
In addition, high-efficiency furnaces may have ribbon or slotted burners. These burners create a more controlled and efficient combustion process, resulting in better heat transfer and increased energy efficiency.
Unlike traditional furnaces, high-efficiency furnaces typically do not have a draft diverter or a natural draft heat exchanger. Instead, they rely on the condensing heat exchanger and other design features to maximize efficiency.
Learn more about high-efficiency furnaces