What method can prevent a furnace explosion?

Purging after ignition failure is a critical safety method used to prevent furnace explosions. When a furnace fails to ignite, unburned fuel can accumulate inside the combustion chamber. If this fuel is not adequately removed before attempting to reignite the furnace, it can result in a dangerous buildup of flammable gases. Purging involves ventilating the combustion chamber to clear out these unburned gases before a new ignition attempt, thereby significantly reducing the risk of an explosion.

This method is essential because it addresses the specific hazard that arises from unignited fuel. By ensuring that the chamber is free of combustible gases, operational safety is greatly enhanced. Adequate purging is a part of standard safety protocols in furnace operations and is emphasized to mitigate explosion risks during ignition failures.