What safety feature is required on portable heaters to prevent gas flow during flame failures?

The requirement for an automatic shutoff feature on portable heaters is essential for safety. This mechanism is designed to detect when the flame goes out, which may occur due to various reasons such as a draft or issues with the burner. In the event of a flame failure, the automatic shutoff quickly interrupts the gas flow, preventing any potential leaks that could lead to hazardous situations like gas accumulation and explosion risks.

By implementing this feature, portable heaters are equipped with an essential safety measure that protects users from the dangers associated with unburned gas. This safety standard helps ensure that if the flame fails, gas flow is immediately halted, thereby promoting safer usage of propane heaters in various environments.