Duct cleaning after a fire in Logan Square

Many of Logan Square's bungalow-style homes, cottages and converted two-flats have gas forced-air furnaces in the basement. A furnace running during a fire pulls smoke through its returns and spreads it through every supply duct. Afterward, gray film reappears around registers and the smell returns whenever the blower starts.

Cleaning covers the returns, supply runs, plenums, blower and coil, not just the registers.

Many greystones heat with radiators but had central air added later, with ducts in closets, soffits or the attic. That ductwork may include flexible duct, which usually has to be replaced after smoke rather than cleaned.

The radiators themselves are cleaned separately; they have no ducts but hold residue on their fins.

Newer buildings give each unit its own ducted heating and cooling. Smoke from a corridor or neighboring unit can reach your system's return. Your unit's system is your responsibility; corridor ventilation belongs to the association.

Ask management whether the shared ventilation was inspected after the fire.

An old burner that misfires can puff soot through the whole duct system. The equipment is repaired first, then every duct and room is cleaned. Oily puff-back soot spreads with each wipe, so order matters.

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

Older houses may use joist spaces covered with sheet metal as return paths. Residue settles on the wood inside them, which is harder to clean than round metal ducts. The scope should name them.

Converted two-flats often have a furnace for each unit side by side. Smoke in the shared basement can contaminate both. Clean both systems in the same visit so one does not re-contaminate the other.

Photograph the filter and stained registers, and make sure the scope your adjuster reviews includes the system. Illinois guidance advises the adjuster's agreement before contracting for repairs ^[4].

Put in a new filter and check it after two weeks. A filter that grays quickly suggests residue remains. Report it while the job is fresh.

Apartments above Milwaukee Avenue shops and restaurants often have small forced-air systems or ducted air conditioning squeezed into closets and soffits. After a fire in a ground-floor restaurant, greasy residue can enter those systems through returns near the stair or through gaps in the floor.

Greasy residue clings to duct walls more than dry soot does and needs degreasing as part of the cleaning. The restaurant's own kitchen exhaust is a separate commercial system, cleaned by its own specialists under the business's policy.

Some of the large single-family homes on Logan Square's boulevards have forced-air systems installed decades ago, with long trunk lines, many branches and some runs through old chases. Smoke from a fire anywhere in the house can reach the farthest bedroom through that network.

A camera inspection helps find residue in the long runs, and the crew may need to open access points to clean them. Original grilles and registers in older homes are removed and cleaned rather than replaced, when the owner wants to keep them.

In a greystone or two-flat, the HVAC cleaning should come after the heavy cleaning of rooms and stairs, so the returns do not pull new residue in. Registers are then sealed until the finish work is done.

Ask the restoration contractor whether they clean the HVAC system themselves or bring in a specialist, and make sure the schedule puts it after the stair and common areas.

Before a furnace or boiler runs again, a qualified heating professional should check the burner, venting and controls, especially if the equipment was exposed to heat, soot or water. Ready.gov advises against turning utilities back on yourself after a fire.

If you smell gas at any point, leave the building and call 911 and Peoples Gas from outside.

Ask for before-and-after photos from inside the ducts, the blower and the coil. Then run the system 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, call the contractor back while the job is fresh.