What type of appliance has combustion products that enter the flue at a temperature of 1,000°F or less?

The classification of appliances based on the temperature of combustion products is crucial in the context of ventilation and flue design in mechanical systems. A low-heat appliance is defined as one that generates combustion products at a temperature of 1,000°F or less. This designation is significant because it impacts how these appliances are installed and the types of materials that can be used for venting systems.

Low-heat appliances typically include residential heating systems such as certain types of furnaces and water heaters. They operate efficiently at lower temperatures, which helps reduce the risk of damage to flue components and minimizes the potential for hazardous conditions like flue gas condensation.

In contrast, other categories like medium, high, and ultra-low heat appliances would have higher combustion gas temperatures, which would necessitate different installation practices and materials to ensure safety and efficiency. Understanding these distinctions is essential for compliance with the North Carolina Mechanical Code and maintaining safe building practices.