A puff back is an explosion inside the burner chamber of the furnace or boiler. Most puff backs are small and are contained to the room where the explosion happens, but in some cases, it sends soot and smoke through the whole establishment. Most puff backs occur in oil-fired heating systems. In a furnace or boiler fueled with gas, the explosion is usually bigger and more damaging. Furnace puff back is messy and potentially dangerous event in which smoke and soot are released into the furnace. Puff backs often require extensive cleaning and sometimes professional restoration to clean up.
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