Duct cleaning after a fire on the Northwest Side

The basement furnace pulls air from returns on the main floor and pushes it up through supply ducts in the walls to every room, including the half-story. If it ran during the fire, it carried smoke everywhere.

Older bungalows often use the space between basement joists as a return, covered with sheet metal. Residue settles on the wood inside. These returns are opened and cleaned as part of the job.

A burner misfire can push soot through every duct. The furnace is repaired first, then the ducts and rooms are cleaned.

Two-flats often have a furnace for each unit. Both are checked and cleaned in the same visit so one does not re-contaminate the other.

Negative pressure with HEPA collection, brushes in each run, cleaning the blower and coil, replacing heavily contaminated flex duct. EPA recommends providers who follow NADCA standards ^[1][3].

Ducts to the half-story bedrooms often run in tight chases and knee-wall spaces. They can hold heavy residue because hot smoke rises there.

A heating professional should check the burner, venting and controls before the furnace runs again, especially if it was exposed to heat or water.

Photograph the filter and stained registers, and include the system in the scope your adjuster reviews ^[4].

Check the new filter after two weeks. A quickly graying filter means residue remains.

Some bungalows still heat with boilers and radiators. Radiators have no ducts, but residue on their fins bakes and smells when heated, so they are cleaned along with the walls. If central air was added later with ducts in the attic or closets, those ducts may need cleaning or, if flexible duct, replacement.

Routine duct cleaning removes dust; fire work removes soot that can be oily and acidic. Ask whether the company has cleaned systems after fires or puff-backs, whether they clean the blower and coil, and whether they keep negative pressure throughout. Ask for before-and-after photos.

Ducts are cleaned after the heavy room cleaning, then registers are sealed until finish work is done. Cleaning them first risks pulling new residue in while the rooms are still being cleaned.

Change filters more often for the first season after a fire. Use the filter rating your furnace is designed for; overly restrictive filters can strain older equipment.

Dutch Colonials in Gladstone Park usually have forced-air systems with ducts running up through interior walls to the upper bedrooms. Smoke from a main-floor fire rises into those upper rooms through both the stair and the ducts.

Long vertical runs to the upper floor collect residue at their bends and boots, so they are cleaned with brushes and air tools from each register as well as from the basement trunk.

Ask for before-and-after photos from inside the ducts, the blower and the coil. Then run the furnace with a new filter, and check the filter after two weeks. If it grays quickly or the smell returns when the heat first comes on in fall, call the contractor back while the job is fresh.

If you smell gas at any time, leave the house and call 911 and Peoples Gas from outside. Ready.gov advises against turning utilities back on yourself after a fire; have a qualified technician restore service and check the equipment.

Many bungalows have furnaces that are already decades old. After exposure to heat, soot or water, an older furnace may not be worth cleaning and repairing. A heating professional's evaluation should guide that decision, and your adjuster should see it before the furnace is replaced.