An unlisted floor furnace must have a temperature limit control that shuts off gas supply if the air temperature exceeds what threshold?

An unlisted floor furnace must be equipped with a temperature limit control that is designed to ensure safety by shutting off the gas supply if the air temperature exceeds 350 degrees Fahrenheit. This threshold is important because it helps prevent overheating, which could lead to hazardous conditions such as fires or damage to the furnace itself. The temperature limit control acts as a safety mechanism, ensuring that the furnace operates within safe limits, thus protecting both the appliance and the surrounding environment.

This specific temperature limit aligns with industry safety standards aimed at mitigating risks associated with heating devices, making it critical for proper function and safety in residential heating applications. Understanding these safety standards is key for anyone involved in the installation or maintenance of gas appliances.