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Commercial Ductwork & Sheet Metal: Fabrication, Installation & Repair
Custom sheet metal fabrication, code-compliant duct installation, and leak repair for commercial buildings across the NYC metro. Whether you're reconfiguring a floor for a new tenant, chasing down a noisy or leaking run, or rebalancing air across a portfolio, our SMACNA-standard duct teams keep conditioned air where it belongs, minimize tenant disruption, and protect your building's airflow and efficiency.
Common Ductwork Problems We Solve
Hot and cold zones / tenant comfort complaints
Leaking joints, disconnected runs, crushed flex, or undersized duct starve some spaces of air while overshooting others. We pressure-check the system, seal or rebuild the failing sections, and right-size the run to restore even delivery.
Audible duct rumble, popping, or 'oil-canning'
Under-gauged or unbraced sheet metal flexes as static pressure changes, producing booming and ticking that travels into occupied space. We add reinforcement (cross-breaking, beading, standing seams, tie rods) or re-fabricate the panel to stop the noise at the source.
Visible air leakage and high energy waste
Open longitudinal seams, failed mastic, and loose slip-and-drive connections dump conditioned air into ceilings and shafts. We seal to a target SMACNA leakage class so the air you pay to condition actually reaches the space.
Sweating ducts and ceiling moisture stains
Missing or wet vapor-barrier insulation lets humid air condense on cold supply duct, staining tiles and risking mold. We strip and replace failed liner/wrap and re-establish a continuous vapor barrier.
Rusted, crushed, or corroded duct sections
Roof leaks, exhaust moisture, and physical damage from other trades degrade galvanized and exhaust duct over time. We cut out and re-fabricate the affected sections in the correct material, including stainless for corrosive exhaust streams.
Restricted airflow after a space change
Walls, new equipment, or sprinkler/lighting work get built across or into old duct routes, choking airflow. We re-survey the space and reroute or re-size the distribution to clear the obstruction and recover capacity.
Ductwork & Sheet Metal Built for Commercial Buildings
Ductwork is the circulatory system of your building's HVAC, and in commercial structures it rarely stays static. Tenant turnover, space reconfigurations, equipment swaps, and decades of pressure cycling all take their toll on supply, return, and exhaust runs. Com+ Mechanical fabricates, installs, and repairs commercial duct systems for office towers, retail, mixed-use, healthcare, schools, and industrial facilities throughout the five boroughs, Nassau, Westchester, northern New Jersey, and Stamford. We fabricate galvanized, aluminum, and stainless sheet metal to SMACNA gauge and pressure-class standards, build rectangular and round/spiral duct to fit your shaft and ceiling constraints, and seal, reinforce, or replace existing runs that leak, rumble, sweat, or fight your air balance. From a single congested mechanical room or a tight tenant fit-out to multi-floor distribution and rooftop tie-ins, our crews coordinate around occupied spaces, building access rules, and after-hours windows so the work gets done without shutting your building down.
What Our Ductwork & Sheet Metal Service Includes
Why Proper Ductwork Pays Off
Our Simple Process
From call to comfort in 4 easy steps
Site Survey & Assessment
We walk the system, field-measure existing runs, check static pressure and obvious leakage points, and review your shaft, ceiling, and access constraints to define exactly what's needed.
Shop Drawings & Custom Fabrication
We produce fabrication drawings and build the sheet metal in-shop to SMACNA gauge and pressure class, so pieces arrive made-to-fit and on-site cutting and disruption are minimized.
Installation & Sealing
Crews install, hang, and brace the duct, then seal joints and seams to your target leakage class, coordinating around occupancy, building access rules, and after-hours windows.
Testing, Balancing & Walkthrough
We verify airflow, check for leaks, confirm dampers and access doors function, and walk the completed work with your team along with documentation for your records.
Types of Systems We Install
Rectangular Sheet Metal Duct
The workhorse of commercial supply and return distribution, fabricated from galvanized steel to fit tight ceiling plenums and shaft chases where height is constrained.
- •Built to SMACNA gauge and pressure class
- •TDC/TDF flanged or slip-and-drive connections
- •Cross-breaking, beading, and tie-rod reinforcement to control noise
- •Internal liner or external wrap options for acoustics and thermal control
Round & Spiral Duct
Lower-leakage, lower-pressure-drop round and spiral duct for main runs, exposed-ceiling architectural installs, and high-velocity systems.
- •Spiral seam construction for strength and lower leakage
- •Cleaner aesthetics for exposed-structure spaces
- •Efficient airflow with reduced static pressure loss
- •Sized takeoffs, reducers, and fittings to match the system
Specialty & Exhaust Sheet Metal
Custom plenums, transitions, kitchen and lab exhaust, and corrosion-resistant duct fabricated for demanding or code-driven applications.
- •Stainless or aluminum for corrosive and high-moisture streams
- •Welded or sealed seams for grease and fume-tight exhaust
- •Custom transitions and offsets for tight equipment tie-ins
- •Access doors and damper provisions for code and maintenance
Why Choose Com+ Mechanical for Ductwork
Commercial sheet metal specialists
We fabricate and install to SMACNA gauge, reinforcement, and pressure-class standards for commercial loads, not light residential duct, so the system holds up under real building static pressure.
In-house fabrication, made to fit
Custom transitions, offsets, and plenums are built to your exact shaft and ceiling conditions, which means fewer field surprises and faster, cleaner installs in tight mechanical spaces.
Built around occupied buildings
We schedule around tenants, loading-dock and freight-elevator access, and after-hours windows, and we contain dust and debris so daily operations keep running.
Portfolio-ready coordination
From one mechanical room to standardized work across a portfolio, we coordinate with property managers, building engineers, and other trades to keep documentation and scheduling consistent.
Transparent Pricing
No fees. No surprises. Just honest service.
Ductwork Assessment & Survey
On-site evaluation for facility teams scoping duct modifications, leakage, or repairs before committing to a project.
- Field measurement of affected runs and access conditions
- Leakage and airflow spot-checks at problem areas
- Findings plus recommended scope and material approach
- Itemized fabrication/installation proposal
Fabrication, Installation & Repair
The core project: custom sheet metal built and installed, or failing duct sealed, reinforced, and rebuilt.
- Shop drawings and made-to-fit sheet metal fabrication
- Installation with proper hangers, bracing, and connections
- Sealing to a target SMACNA leakage class
- Insulation/vapor-barrier repair and equipment tie-ins
- Coordination around occupancy and after-hours access
Ductwork Maintenance Agreement
Planned periodic inspection and upkeep of duct systems across one building or a portfolio to catch leaks and damage early.
- Scheduled duct integrity and leakage inspections
- Insulation and vapor-barrier condition checks
- Priority response and scheduling for duct repairs
- Documented findings to support capital planning
All ductwork pricing is scoped after an on-site assessment, because cost depends on material (galvanized, aluminum, stainless), gauge and pressure class, linear footage, access difficulty, and whether work must happen after hours.
Own a Commercial Property?
Business+ plans start at $499/year — includes 2 rtu tune-ups, 10% off all services, and priority scheduling.
Equipment & Brands We Service
Factory-trained technicians for all major HVAC manufacturers
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Frequently Asked Questions
Get answers to common questions about our services
Can you do ductwork without shutting down our building or disrupting tenants?
Yes. Most commercial duct work can be staged and sectioned so conditioned spaces stay online, and we routinely fabricate off-site and install during evenings or weekends to minimize impact. We coordinate with your building engineer on access, freight-elevator and loading-dock scheduling, and dust containment so daily operations keep running.
Do you offer emergency or fast-response duct repair?
Yes. Disconnected runs, collapsed duct, or a major leak after another trade's work can be addressed on a priority basis, and we offer 24/7 response for urgent situations. Call (332) 600-4640 to dispatch a crew.
Can you manage ductwork across multiple buildings in our portfolio?
Absolutely. We work with property managers and facility teams managing multi-building portfolios across the NYC metro, standardizing fabrication specs, sealing classes, and documentation so the work is consistent from site to site and easier to budget and track.
How does ductwork affect energy use and Local Law 97 compliance?
Leaky, poorly insulated duct forces your heating and cooling equipment to run longer to overcome losses, which raises energy use and, in turn, the carbon emissions that Local Law 97 measures for covered NYC buildings. Sealing duct to a tighter SMACNA leakage class and restoring vapor barriers reduces wasted conditioned air, helping your HVAC operate closer to its rated efficiency.
What materials and standards do you fabricate to?
We fabricate in galvanized steel, aluminum, and stainless depending on the application (stainless for corrosive or high-moisture exhaust, for example), and we build to SMACNA gauge, reinforcement, and pressure-class standards so the duct holds up under real commercial static pressure. We seal to defined SMACNA leakage classes appropriate to the system.
Do you provide insurance documentation for building access?
Yes, we provide a certificate of insurance and coordinate with your building's access and contractor requirements before work begins.
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Get Your Ductwork Done Right, the First Time
Whether you're reconfiguring a floor for a new tenant, sealing a system that's bleeding conditioned air, or rebuilding duct that's noisy, rusted, or sweating, Com+ Mechanical brings commercial-grade sheet metal fabrication and code-compliant installation to buildings across the NYC metro. For ongoing peace of mind, a ductwork maintenance agreement keeps your distribution inspected and sealed on a planned schedule, so you head off leaks and damage before they become tenant complaints or emergency calls, and your facility budget stays predictable. Call (332) 600-4640 or request an assessment to get a scoped, no-guesswork proposal for your building or portfolio.
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