What is the highest temperature that Category IV appliances' flue gas will achieve before its dew point?

For Category IV appliances, the flue gas temperature is a critical factor to understand how these systems operate efficiently and safely. Category IV appliances are designed for high-efficiency, condensing applications, which means they can handle lower flue gas temperatures.

The highest temperature that the flue gas will achieve before reaching its dew point is typically around 60 degrees. This temperature is significant because it indicates the maximum level before the gas begins to condense into liquid, which is essential for preventing moisture-related damage and ensuring optimal performance of the appliance.

Exceeding this temperature could lead to inefficiencies and potential failures, as the condensation of flue gas is a fundamental aspect of how Category IV systems are intended to function. Therefore, recognizing that 60 degrees represents the upper limit for effective operation is crucial for anyone working with this type of HVAC equipment.