Chimney fan installation for flues that cannot pull on their own
Chimney fan installation puts a powered exhauster on top of the flue so it pulls smoke up and out at a steady rate whatever the wind or the house is doing. The New Bedford office on Union Street arranges it for homes in the city and in Acushnet, Fairhaven and Dartmouth, but only after the flue has been confirmed clean, sound and correctly sized, since a fan cannot fix those faults.
Local setups where a fan earns its place
Most draft problems are solved at the flue or the hearth. A fan is for the chimneys left over, and certain local building patterns produce more of those.
Low stacks beside tall neighbors
New Bedford has whole districts of three-deckers built close together. A chimney on a lower house next to one of them can sit in turbulent air that no cap fully calms, and raising it is not always practical or allowed.
Basement and lower-level appliances
The raised basements common in local houses often hold a fireplace or stove. Down there the house pulls air inward hardest in winter, which can beat a short flue’s natural draft.
Additions with short flues
A one-story addition or a stove added to a low wing may have a chimney too short to build much draft. A fan gives it the pull its height cannot.
Housing ages, heating fuels and storm history come from the sourced notes on our community pages: New Bedford, Dartmouth, Fairhaven, Acushnet.
Fitting a fan, start to finish
We first prove that a fan is the right answer. Mounting one on a blocked or damaged flue only hides a problem that can still be dangerous.
Confirm what is wrong
The flue is inspected and cleaned if needed. Its size and condition, the opening, the cap and the house’s air supply are all checked before a fan is even discussed.
Pick a fan listed for the job
The fan has to be listed for the appliance and fuel it will serve and sized for the flue, following the manufacturer’s instructions and listing.
Make the flue top ready
The crown or flue tile has to be sound and level for a secure mount. Any repair needed there comes first, so the fan does not sit on crumbling masonry.
Mount it against the weather
The fan is fastened to the top of the flue so it stays firmly in place through coastal wind, driving rain and winter storms.
Arrange the wiring
The fan needs power and an indoor speed control. That wiring is usually work for a licensed electrician, and we coordinate the timing with them.
Adjust and test the draft
With the fan running and the appliance lit, we check the draft and set the speed so the fire draws well without running the fan harder than it needs.
A fan does not make an unsafe flue safe. Cracked tiles, open joints and failed liners are repaired first.
Fans on wood-burning flues collect residue and need periodic cleaning and a check along with the chimney.
When a fan becomes worth discussing
These signs usually come after other fixes have been tried and the chimney still will not cooperate.
- Smoking that outlasted other fixesThe flue is clean, a cap is on, the opening has been reduced, and smoke still rolls into the room.
- A chimney that cannot be raisedThe stack is clearly too short for its surroundings, but extending it is impractical or not permitted.
- A basement fireplace that never drawsFires on the lowest floor struggle all winter while fireplaces on upper floors work normally.
- Draft that dies in certain windsThe chimney works on calm days but fails whenever wind comes from one direction off the water or a nearby building.
A fan, or a fix that comes first?
A fan suits a flue that is clean, intact and correctly sized but still cannot draw reliably because of its height, its setting or pressure inside the house. If the cause has not been pinned down yet, that comes first.
Ask for chimney fan when
- A short chimney that cannot be extended
- A chimney overshadowed by a taller building nearby
- A fireplace or stove on the basement level
- Draft trouble left over after other repairs
Ask about a different page when
- Cause of the smoking still unknown: Downdraft repair
- Creosote or debris narrowing the flue: Chimney Sweeping
- A flue too large for the appliance: Chimney Liner Installation
What affects a fan installation
No two fan jobs are the same. After a look at the chimney, these points decide the scope.
- Condition of the flue top
- A sound, level tile or crown takes the mount directly. A cracked crown or loose top courses need repair before the fan can go on.
- Flue size and shape
- Round, square and rectangular flues take different mounts, and the fan has to suit both the size of the flue and what it vents.
- Getting the wiring there
- The route for power from inside the house to the chimney top varies a lot, and that route sets the electrician’s part of the job.
- Reaching the roof
- A chimney on a steep or three-story roof needs more setup to work on safely than one on a low addition.
No price list on this site, on purpose. Two chimneys that sound the same over the phone rarely are. Once someone from the New Bedford office has looked at yours, you get the scope in writing and decide from there.
Common questions about chimney fans
Will the fan be noisy?
A fan makes some sound, mostly heard outside near the chimney top. Indoors, most people notice it little, especially at the lower speeds where it usually runs. Running it faster than needed is what makes it louder, which is one reason the speed is set carefully after testing.
What happens during a power cut?
The fan stops and the chimney falls back on whatever natural draft it has, which is often why the fan was added. A wood fire left burning without the fan may smoke into the room, so it is wise to let it burn down and keep the room ventilated until power returns.
Can a fan go on a flue that vents a gas or oil appliance?
Some fans are listed for gas and oil appliances, and on those systems the fan is typically interlocked so the burner will not fire unless the fan is running. Whether that suits your setup depends on the appliance and the manufacturer’s instructions, and we check both before recommending it.
Do I need an electrician?
Usually, yes. The fan needs a power supply and a control indoors, and that wiring is normally done by a licensed electrician. We coordinate with them so the fan is mounted and the wiring finished in a sensible order, and the local building official decides whether a permit is needed.
Is a fan certain to cure the smoking?
A correctly chosen fan on a sound flue fixes most draft problems that come from height, wind or house pressure. It will not fix a blocked or damaged flue, which is why we confirm the cause first. If there is reason to doubt a fan will fully solve yours, we say so up front.
Booking, hours and general chimney questions are on the main FAQ; how a visit runs is on what to expect.
Often looked at alongside
- Downdraft repairTracing why smoke or cold air comes down the chimney, then correcting the flue, the top or the air supply.
- Chimney Cap InstallationMeasuring each flue and fixing a screened stainless or copper hood over it against weather and wildlife.
- Chimney InspectionA yearly check of the firebox, damper, flue and chimney top, with photographs and a plain list of findings.
- Chimney Crown RepairSealing, patching or recasting the concrete slab on top of the chimney so rain runs off the stack.
Background reading
- 7 minThree-Decker and Two-Family Chimneys in New Bedford: What Owners Should KnowSeveral flues in one stack, gas boilers in old coal flues, tall tops in the harbor wind: how to look after a multifamily chimney.
- 6 minBefore You Light a Wood Stove This Winter: A ChecklistThe flue, the wood, the clearances and the permit: what to check before the first stove fire of the season, or before installing a new one.
- MapThe four places we coverNew Bedford · Dartmouth · Fairhaven · Acushnet, all from one office downtown.