Chimney, Dryer Vent and Air Duct FAQ

The NFPA 211 standard calls for chimneys, fireplaces and vents to be inspected once a year, and the inspection tells us whether a sweep is needed. Fireplaces used often for wood fires usually need sweeping more often than gas appliances. We'll recommend a schedule based on what we find.

A sweep removes soot, creosote and debris from the flue, smoke chamber and firebox. Creosote builds up from burning wood and can catch fire if it gets thick enough. We also clear out nests, leaves and other blockages that stop smoke from venting properly.

A Level 1 inspection fits when nothing about your system has changed. A Level 2 is called for when the system changes, such as a new appliance or a switch of fuel, or when the home is sold. A Level 3 is used when a hidden hazard can only be reached by opening part of the chimney or building.

Yes, if the chimney vents a furnace, boiler or water heater, it's working even when the fireplace sits cold. Unused flues can also collect nests, debris and water damage. A yearly inspection catches these problems before they affect your heating system.

When a New York City building converts its boiler from oil to gas, the chimney has to be evaluated as part of the project. 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 your liner options.

Common signs include crumbling mortar, loose or spalling bricks, water stains near the fireplace, rust on the damper, and pieces of tile or masonry in the firebox. Smoke backing up into the room is another warning sign. An inspection shows what's causing the problem and what repair fits.

A chimney cap sits on top of the flue to keep out rain, animals and debris while letting smoke escape. A chase cover seals the top of a framed or prefabricated chimney enclosure. Both help limit water damage, which is one of the main causes of chimney deterioration.

Brick and mortar absorb water, and repeated freeze-thaw cycles can crack and break down the masonry. A breathable waterproofing treatment helps the chimney shed water while still letting moisture escape. It works best after any needed repairs are made.

According to the U.S. Fire Administration, failure to clean is the leading factor contributing to clothes dryer fires in homes. Lint collects in the vent line, restricts airflow and can ignite. Long drying times, a hot laundry room or a burning smell are signs the vent needs attention.

The U.S. EPA advises cleaning air ducts when there is substantial visible mold growth, vermin, or excessive dust and debris. It also notes that duct cleaning has not been shown to prevent health problems. We'll look at your ducts and tell you plainly whether cleaning makes sense.

We don't apply chemical treatments by default. The EPA advises consumers to be careful with chemical treatments in ducts, and we only discuss them when there's a specific reason. If one is suggested, we'll explain what it is and why before doing anything.

Don't use the fireplace for at least a day beforehand so the firebox is cool. Clear a path to the fireplace, dryer or vents, and move furniture and decorations a few feet away. If your building needs roof access arranged, confirm it with your super ahead of time.

It depends on the service, the number of flues or vents, and how easy the roof and work areas are to reach. A routine sweep and inspection of a single flue is usually finished within a few hours. We'll give you a time estimate when you book.

We lay down drop cloths, seal off the fireplace opening, and use vacuums designed to capture soot and dust. Our technicians clean up the work area before they leave. Some light dust is possible, but we work to keep your rooms as clean as we found them.

Please keep pets in a closed room away from the work area during the visit. The noise, equipment and open doors can stress animals or let them slip outside. It also keeps them away from soot and debris.

Many chimneys in rowhouses and apartment buildings are reached through a roof hatch or bulkhead door. Your super or managing agent may need to unlock it, provide an escort, or approve the work in advance. During New York City's heat season, from October 1 through May 31, buildings often prefer to plan heating-system work ahead, so it helps to schedule early.