What standard must factory-built fireplaces be tested in accordance with?

Factory-built fireplaces must be tested in accordance with UL 127, which is the standard specifically developed for factory-built fireplaces. This standard evaluates the construction and performance of these units, ensuring they are safe to use and meet specific safety criteria. UL 127 covers aspects such as thermal performance, structural integrity, and the ability to contain combustion safely, providing confidence to both manufacturers and consumers regarding the product's reliability and safety in residential settings.

In contrast, the other standards listed pertain to different categories of products and equipment within the fire safety and construction sectors. For example, UL 1618 relates to the safety of factory-built chimneys, ASTM E 1509 pertains to air pollution control, and UL 730 addresses standard performance for gas-fired fireplaces. Each of these has its specific applications and therefore do not apply to the testing of factory-built fireplaces.