A puff-back is a release of smoke or soot associated with abnormal combustion in fuel-burning heating equipment.
What this means at your property
Residue near an appliance can signal a problem that needs an equipment specialist as well as cleaning. Wiping the visible marks does not correct the combustion or venting condition that produced them.
What must happen before normal operation resumes?
Have the affected equipment evaluated by a qualified heating professional and follow any emergency instructions. After the immediate concern is addressed, document affected surfaces and coordinate residue cleanup with the equipment repair record.