Chimney and Duct Cleaning FAQ

The NFPA 211 standard calls for chimneys, fireplaces and vents to be inspected once a year, and the inspection shows whether a sweep is needed. Fireplaces used often through the winter usually need sweeping more frequently than ones used a few times a season. We'll tell you what we find and recommend a schedule based on your actual use.

A sweep removes soot, creosote, loose debris and any blockages such as leaves or nesting material from the flue, smoke chamber and firebox. Creosote is a flammable residue that builds up from burning wood, and heavy buildup raises the risk of a chimney fire. Clearing it also helps your fireplace draft properly.

Yes. Gas and oil appliances don't produce wood creosote, but their flues can still collect soot, scale, debris and corrosion. Blocked or damaged flues can push exhaust back into the home, so these chimneys need regular inspection and cleaning as well.

Chimney professionals use three levels. A Level 1 inspection is for a system that hasn't changed. A Level 2 is for when something changes, such as a new appliance or a switch of fuel, or when the home is sold. A Level 3 is for when a hidden hazard has to be reached by opening part of the chimney or building.

A home sale is one of the situations that calls for a Level 2 inspection. It gives buyers and sellers a clear picture of the chimney's condition before closing. Our certified technicians document what they find so you can make informed decisions.

In New York City, the chimney has to be evaluated as part of an oil-to-gas conversion. A new liner is often needed because gas exhaust produces acidic condensate that can corrode a masonry flue. We can inspect the chimney and explain whether relining is required.

Common signs include crumbling or missing mortar, cracked or loose bricks, white staining on the masonry, water leaking into the fireplace, rust on the damper, and pieces of tile falling into the firebox. A damaged crown, cap or chase cover can also let water in. We handle chimney repair, waterproofing, cap and chase cover replacement, fireplace and damper repair, and full chimney rebuilding when it's needed.

A liner protects the surrounding masonry and nearby building materials from heat and corrosive exhaust, and it helps the flue vent properly. Older chimneys may have cracked clay tiles or no liner at all. We install liners sized for the appliance the chimney serves.

According to the U.S. Fire Administration, failure to clean is the leading factor contributing to clothes dryer fires in homes. Lint builds up inside the vent duct over time, beyond what the lint trap catches. Long drying times, a hot laundry room or a burning smell are signs your vent needs attention.

The U.S. EPA advises cleaning air ducts when there is substantial visible mold growth, vermin, or excessive dust and debris. The EPA also notes that duct cleaning hasn't been shown to prevent health problems, so we won't claim it will. We'll look at your system and tell you honestly whether cleaning makes sense.

The EPA urges caution with chemical treatments in ductwork. We focus on mechanical cleaning and don't apply chemicals unless there's a clear reason and you've agreed to it. The EPA also recommends researching the process before responding to very cheap advertised offers, and we're glad to explain exactly what our work involves.

Let any fire burn out completely, ideally at least a day before the visit, so the fireplace is cool. Clear a path to the fireplace, appliance or dryer, and move fragile items away from the hearth. If roof access is needed, arrange it with your building in advance.

A standard sweep or dryer vent cleaning usually takes a couple of hours, while inspections that involve camera work, repairs or multiple flues take longer. We'll give you an expected time when we book. We lay down drop cloths and use vacuums with filtration to contain soot and dust, and we clean up the work area before we leave.

Please keep pets in a closed room away from the work area during the visit. Doors may be open, and equipment, noise and soot can stress animals or put them at risk. Keeping them separate also helps the work go faster.

Many chimney jobs require reaching the top of the flue, so we may need roof access through a hatch, bulkhead or neighboring roof. In apartment and co-op buildings, please let your super or management office know about the visit and confirm any access rules or paperwork they require. In rowhouses, tell us how the roof is reached so we can plan ahead.

New York City's heat season runs from October 1 through May 31, when building owners must keep apartments heated to the city's minimum temperatures. Scheduling inspections and repairs before the season starts means your chimney and heating flue are ready when you need them. Late spring and summer are good times for masonry repairs, waterproofing and relining.