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Chimney Smoke Test in NYC and Long Island
If you are converting an appliance to gas and need to prove the flue is sealed, or you suspect smoke and combustion gases are escaping through a hidden crack, a chimney smoke test gives you the answer. Our certified inspectors send controlled smoke through the flue, watch for the exact point where it escapes, and document whether the chimney is tight or leaking.
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Certified and Licensed
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Lifetime Warranty
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Free Estimates
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Emergency Service 24/7
OVERVIEW
Proof That the Flue Holds Smoke and Gases
A chimney smoke test answers one question with certainty: is the flue holding smoke and combustion gases where they belong, or is some of it escaping into the property. Many breaches stay hidden behind masonry, inside chase walls, or along a liner where a camera and a flashlight cannot see them. Controlled smoke brings those faults into plain view.
This flue leak test suits both homeowners and building or property managers. It is the standard way to prove a flue is sealed before an appliance is converted to gas, to confirm the cause when smoke or an odor is reaching living space, and to verify flue integrity after work on a boiler or heating appliance.
The test is about tightness, not performance. It shows whether the passage leaks and where, so you know the true condition of the chimney before you rely on it.
WHAT WE CHECK
The Faults a Smoke Test Reveals
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Liner cracks and breaches
Controlled smoke escaping through the liner marks the exact spot where a crack or gap is letting gases into the property.
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Masonry gaps and voids
The test exposes open mortar joints, voids, and separations in the surrounding masonry that a visual check can miss.
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Flue connections and joints
We watch the points where sections and appliance connections meet, since these seams are common places for smoke to seep out.
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Concealed leaks behind walls and chases
Where smoke shows through a wall, ceiling, or chase, it confirms a breach hidden from direct view.
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Cross flue leakage
Smoke passing from one flue into an adjacent flue reveals a breach in the dividing wall of a shared chimney.
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Overall seal for a gas conversion
When the flue holds the smoke with no escape, the test confirms the passage is sealed and ready to be relied on.
OUR PROCESS
How We Run a Smoke Test
01
Review and Setup
We confirm the reason for the test, examine the chimney and its venting, and prepare the flue so smoke can be introduced safely.
02
Seal the Openings
We block off the relevant flue openings so the smoke stays contained and any escape point becomes obvious.
03
Introduce Controlled Smoke
We fill the flue with dense, controlled smoke, sometimes under slight pressure, and observe the full run of the chimney inside and out.
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Locate the Leaks
We track exactly where smoke escapes and note every crack, gap, or breach it reveals, capturing photos or video where relevant.
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Report the Findings
We walk you through what the test showed and deliver the written report with the location of any leak clearly recorded.
COMPLIANCE
A Written Record You Can Submit
INSPECTED
Full Flue Reviewed
The chimney and its venting are examined before and during the test.
TESTED
Seal Confirmed
Controlled smoke shows whether the flue holds or where it leaks.
DOCUMENTED
Findings Recorded
You receive a written report with photos or video where relevant.
WHY US
What Sets Our Testing Apart
Certified Inspectors
Trained professionals run and document every smoke test.
Exact Leak Location
We pinpoint the escape point, not just a general area.
Honest Findings
We report what the test shows, with no pressure and no upsell.
Clear Report
Written documentation you can understand, keep, and submit.
Fast Scheduling
Same day appointments across the service area when you need a quick answer.
Licensed and Insured
Fully covered for work on residential and commercial properties.
WHO WE SERVE
Tests for Homes and Managed Buildings Alike
A flue can leak in any kind of building, and the reason for testing it shifts with the reader. Homeowners often want proof that a flue is tight before converting to gas or before trusting a chimney with smoke reaching a room. Building and property managers need the same proof across their portfolios, whether they are clearing a chimney for use, responding to a reported odor, or confirming integrity after boiler work.
- Single family homes
- Townhouses and condos
- Brownstones
- Historic homes
- Multi family buildings
- Commercial and office buildings
- Restaurants and kitchens
- Hotels and hospitality
Schedule an Inspection
Serving Brooklyn, Manhattan, the Bronx, Queens, Staten Island, and Long Island.
OUR WORK
Recent Smoke Test Projects
- Fireplace and Firebox
Custom Fireplace Construction with Class A Chimney and Offset Flue
A new masonry fireplace built to the project plans, with a custom firebrick firebox, smoke chamber and an offset connection into a Class A insulated chimney.
- Fireplace and Firebox
Brownstone Fireplace Reconstruction and Restoration
A decommissioned fireplace in a historic brownstone brought back to life with a new firebrick firebox, rebuilt masonry and a reinstalled stainless steel liner.
REVIEWS
What Our Clients Say
Mike S.
Chimney Professionals did a terrific job cleaning my two wood burning fireplaces in a Manhattan brownstone. They came within one day. Their equipment is state of the art, and it was all done in less than 30 minutes. Everything kept spotless. The price was right too.
1 Mar 2026
M. J.
Not only did they answer right away, they had Rod at my door first thing Monday morning and sourced a hard to find part same day when others could not. They beat every other quote I got and had our system back up and running in under an hour.
27 Oct 2025
Bruce S.
The chimney in my 115 year old brick rowhouse had a badly deteriorated terra cotta lining. Michael gave me a fair price, was punctual, and while spending more time than he expected, stuck to the original price. Kudos to Michael for getting a tricky job done.
2 Nov 2025
Jim S.
Mike and his team are phenomenal. Very quick to respond and schedule and then more importantly, absolute professionals. Deep cleaned the chimney and made sure they cleaned any residual dust around the area.
13 Nov 2025
Ryan L.
Our building needed three new liners for each apartment. They did a great job with the removal and new installation. Mike was very easy to work with, and very responsive with any follow ups.
10 Aug 2025
Donna L.
Chimney Professionals were prompt, professional and neat. We would recommend them to anyone looking to get their fireplaces cleaned. A pleasure to work with.
3 Dec 2025
Alan H.
We asked them to inspect our roof and chimney before an upcoming home inspection. They explained every detail clearly, helped us understand what needed fixing, and even assisted with budgeting.
10 Dec 2025
Baktiar M.
Same day service, quick and efficient. Used drones to check the chimney and provided a report. Definitely recommend.
25 Feb 2025
Kara T.
They were able to come out next day and fix our gas fireplace issue. They listened to all of our concerns and addressed any questions we had while thoroughly explaining the work that needed to be done. The price was fair and upfront.
15 Nov 2024
Brandon G.
Mike set up an appointment for the next day to clean our dryer vent. He maintained good communication the whole time. The technician who arrived was professional and did a thorough job. The price was reasonable too.
23 Aug 2025
FAQ
Common Questions About Smoke Tests
It is an inspection where controlled smoke is sent through the flue so we can see exactly where it escapes. Any smoke seeping out reveals a crack, gap, or breach that lets combustion gases into the property.
Converting an appliance to gas depends on a flue that is fully sealed. The test proves the passage holds smoke with no escape, which is the evidence that the flue is ready.
A camera scan shows the physical condition inside the flue, while a smoke test proves whether the flue actually holds smoke and gases. The two work well together, and we can advise which fits your situation.
Yes. Breaches behind masonry, inside a chase, or along a hidden section often do not show on camera but reveal themselves the moment smoke escapes through them.
We record the exact location in your report, and our repair service seals it once you approve the work.
Yes. You receive a written report of what was checked and found, along with photos or video where relevant.
The price depends on the property, the number of flues, and access. We provide a free estimate before any work, so you know the cost in advance.
We offer same day appointments across Brooklyn, Manhattan, the Bronx, Queens, Staten Island, and Long Island whenever scheduling allows.
Confirm Your Flue Is Sealed and Safe
Schedule a chimney smoke test with our certified inspectors and get honest findings with clear documentation for your home or building.