How Do You Tell If Smoke Has Gotten Into Your Home's Ductwork?

A smoky odor that returns whenever the heating or cooling system runs is a common clue. The smell may be stronger at vents or registers, and it can persist for weeks after the fire is out. You might also notice a gray or brown film on walls, ceilings, or furniture near the duct openings.

Visible soot around vent covers or on the duct surfaces themselves points to smoke residue. If the system has been off, the smell may be less obvious, so turn the fan on and check each room. Dark streaks on filters or inside the air handler are further signs that smoke has traveled through the ductwork.

• Lingering smoky odor from vents
• Soot or dark streaks near registers
• Gray or brown film on nearby surfaces
• Discolored air filters
• Residue on the blower or fan blades
• Smell that intensifies when the system runs

A local water damage pro can inspect the ductwork using a borescope or a camera to see inside the channels. They look for soot, ash, and oily residue that indicate smoke has deposited. They may also use a moisture meter to check for dampness, which can worsen the odor.

The inspection usually covers the main trunk lines and branch runs, as well as the air handler and filter slots. You can ask the pro to show you what they find on a screen or with photos. This helps you understand the extent of the residue and what cleaning steps might be needed.

After a fire, even a small one, act quickly to keep smoke from settling. Close off rooms that are not affected and open windows to ventilate. Change the air filter in your HVAC system, as it may hold smoke particles that recirculate.

If you live in Detroit, keep your system off until a pro has checked the ducts. Running the fan can push soot deeper into the system. Regular filter changes and annual inspections can help you catch smoke residue early before it becomes a bigger problem.