Or Call Now: 646-401-3121 - Venting and Exhaust Fans
Oil-Fired Generator Chimney Installation
A dedicated stainless steel chimney for an oil-fired generator, routed up the exterior wall and terminated above the roofline.
Commercial Chimney Rerouting in NYC and Long Island
We relocate commercial chimney and flue runs to restore proper draft, clear obstructions, and match building changes. When a renovation, new equipment, or a blocked path puts your venting at risk, one team assesses the run, engineers a corrected route, and installs it so your boiler stack vents safely and passes inspection.
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Certified and Licensed
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Lifetime Warranty
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48 hr Proposal Turnaround
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Emergency Service 24/7
OVERVIEW
A Corrected Flue Path Built to Spec
Commercial chimney rerouting changes the direction, pitch, or termination of an existing flue so combustion gases exit safely and the appliance drafts as designed. When a run develops too many bends, hits a structural obstruction, or no longer matches the building, venting suffers and code compliance is at risk. We evaluate the full path from the appliance breeching to the termination and design a corrected route sized to the load.
Property managers, general contractors, mechanical contractors, and facility engineers work with a single accountable team from the first assessment through permitting, installation, and warranty. We handle engineered drawings, NYC Department of Buildings filings, and installation in occupied buildings, so a chimney relocation project stays on schedule and fully documented from quote to closeout.
- 20+ Years in Business
- 1,000+ Projects Completed
- 48 hr Proposal Turnaround
- 24/7 Emergency Service
WHEN YOU NEED IT
When a Commercial Chimney Needs Rerouting
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A renovation or build out changes the layout
A gut renovation, added floor, or reconfigured mechanical room moves walls and shafts, and the existing flue no longer fits the new plan. Rerouting brings the run through a viable path that respects the finished space.
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New or relocated mechanical equipment needs a different path
A replacement boiler, added appliance, or relocated unit sits in a new position or vents at a new size. The flue route has to move to meet the equipment where it now stands.
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A structural obstruction blocks the existing run
New steel, a slab, an elevator override, or added rooftop structure sits in the line of the old chimney. We design a route that clears the obstruction while holding required clearances.
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A poor original path chokes the draft
Too many elbows, long horizontal offsets, or undersized sections restrict flow and leave the system sluggish or backdrafting. A corrected path with proper sizing and minimal bends restores reliable draft.
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A clearance or code issue on the current route
An existing run that violates clearance to combustibles, sits too close to windows or intakes, or falls short of current code has to be relocated to pass inspection and document compliance.
OUR PROCESS
How We Deliver a Rerouting Project
01
On Site Assessment
We inspect the appliance, breeching, existing flue, and termination, then use camera inspection where needed to confirm the condition of the current run and the constraints of the building.
02
Engineering and Draft Calculation
We size the new route to the load, calculate draft, and produce stamped engineered drawings that show the corrected path, materials, and clearances.
03
Permitting and Written Scope
We handle NYC Department of Buildings filings and permitting, then issue a written scope and fixed proposal so approvals are in place before work begins.
04
Rooftop and Access Setup
We set scaffold and secure exterior and rooftop access as the route requires, protecting occupied areas and staging the site for a clean, controlled installation.
05
Installation and Commissioning
We install the rerouted system with minimal downtime in occupied buildings, verify draft on the corrected path, and issue certification documentation for your compliance files.
COMPLIANCE
Filed, Inspected, and Documented
DRAWINGS
Stamped and Calculated
Stamped engineered drawings and draft calculations for the corrected route.
PERMITS
Filed and Coordinated
Permit filing and inspection coordination handled by our team.
EVIDENCE
Photographed on Completion
Post completion certification and photographic reporting for your insurance and regulatory files.
WHY US
Why Building Owners Choose Us for Rerouting
Boiler Stack and Flue Expertise
We specialize in commercial boiler stacks, breeching, and flue systems, including oil to gas conversion venting and re sizing on rerouted runs.
One Accountable Team
Assessment, engineering, permitting, and installation stay with a single team from quote to warranty, with no handoffs between vendors.
Occupied Building Protocols
We schedule and stage the reroute to keep tenants and operations running with minimal downtime and disruption.
48 Hour Proposal Turnaround
You get a written scope and fixed pricing fast, so approvals and budgets move without delay.
Contractor Ready
We work cleanly as a subcontractor on renovation and equipment projects, delivering drawings, permits, and the rerouted system on your schedule.
Licensed and Fully Insured
We carry full commercial insurance and provide certification documentation on every completed project.
WHO WE SERVE
Commercial Properties Across the Region
We work with property managers, building owners, general contractors, mechanical contractors, and facility engineers on rerouting projects of every size and type.
- Multi family buildings
- Commercial and office buildings
- Restaurants and kitchens
- Hotels and hospitality
- Industrial buildings
- Hospitals and institutions
- Houses of worship
- Retail and mixed use
Schedule a Free Consultation
We serve Brooklyn, Manhattan, the Bronx, Queens, Staten Island, and Long Island.
OUR WORK
Recent Rerouting Projects
- Chimney Rebuild
Complete Chimney Stack Rebuild and Masonry Restoration
A severely deteriorated rooftop chimney stack was dismantled to a sound base and rebuilt in new red brick, with a new crown and a stainless steel cap.
- Chimney Rebuild
Complete Chimney Rebuild, Before and After
A failing chimney with crumbling mortar, damaged brick and a broken crown, fully dismantled and rebuilt with a new concrete crown, cap and weather-sealed base.
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
Commercial Rerouting Questions
Yes. We file with the Department of Buildings, provide stamped engineered drawings and draft calculations, and coordinate inspections as part of the project.
Yes. We stage the work and schedule around operations to keep tenants and equipment running with minimal downtime.
Yes. Conversions often change flue sizing and routing, and we design and install the corrected venting to match the new equipment.
We size the route to the appliance load, calculate draft, and lay out a path with minimal bends that holds required clearances and clears any obstruction in the run.
We deliver a written scope and fixed pricing within a 48 hr proposal turnaround, and we respond to emergencies 24/7.
We set scaffold and provide exterior and rooftop access for tall commercial stacks as part of the installation plan.
Reroute Your Commercial Chimney With One Accountable Team
From engineered drawings and permits through installation and warranty, we correct the path and document the work.
MANUFACTURING
We Manufacture the Parts Your New Route Needs
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Stainless Steel Pipes
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Chimney Liners
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Custom Caps
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Chase Covers
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Tees, Wyes, and Elbows
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Adapters and Reducers
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Flue Pipes
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Custom Fabrication
Rerouting comes down to geometry
Stock fittings rarely match the exact angles a corrected path requires. Because we manufacture our own UL Listed stainless steel, we build the precise elbows, tees, wyes, and transitions your route needs and handle the whole reroute end to end, with no supplier delays and no third party markup.
What that means for your project
- Custom elbows, tees, wyes, and transitions built to the required angles and offsets
- Commercial grade stainless steel that resists heat and chemical corrosion under heavy continuous use
- Components sized to the load rather than pieced together from stock fittings
- Lifetime warranty on the systems we install, registered as part of the project
