Solid fuel furnaces are required to be tested in accordance with which standard?

Solid fuel furnaces must be tested in accordance with UL 391, which is the safety standard specifically designed for them. This standard outlines the requirements for design, construction, and performance for solid fuel-burning appliances to ensure they operate safely and effectively.

The parameters set forth in UL 391 focus on reducing risks associated with the use of solid fuel, including fire hazards, emissions control, and overall performance. Compliance with this standard is crucial for manufacturers and installers to ensure that solid fuel furnaces meet safety regulations and provide safe heating solutions for homes and buildings.

While other standards such as UL 1995, which pertains to heating and cooling equipment, and UL 727, which concerns the testing of chimney systems for solid fuel appliances, cover different aspects of HVAC equipment, they do not specifically address the requirements for solid fuel furnaces themselves. UL 499 deals with electric heating appliances and is also not relevant to solid fuel systems. Therefore, UL 391 is the correct standard for testing solid fuel furnaces.