The 35710 is a heat exchanger from Atwood for AFMD series furnaces.

Regular maintenance and inspection of heat exchangers in furnaces is crucial for safety and efficiency. Signs like cracks, corrosion, or rust indicate potential issues. Consider replacement if the furnace is over 15-20 years old, experiences frequent breakdowns, or shows inefficiency. Prompt replacement is essential to avoid carbon monoxide leaks and high energy bills.