Gas Heat ESCO Practice Exam

The typical flue gas temperature of a Category III furnace is:

1. 100 F - 150 F

2. 200 F - 250 F

3. 280 F - 300 F

4. 350 F - 400 F

The correct answer is: 100 F - 150 F

The typical flue gas temperature for a Category III furnace generally falls within a higher range compared to the temperature provided in your selected answer. Category III appliances are designed to handle flue gases that can be increased in temperature due to the design characteristics of the unit. Typically, a Category III furnace can produce flue gas temperatures around 200°F to 250°F, which is necessary for maintaining effective draft and ensuring proper exhaust of combustion products. This temperature range allows for efficient operation and helps to mitigate condensation in the flue design, which is a key consideration in preventing corrosion and increasing the unit's lifespan. Understanding the operational characteristics of different appliance categories is vital since they influence installation practices and maintenance procedures. Category III systems must effectively manage the higher temperature of flue gases to ensure safety and efficiency in heating applications.