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Commercial Exhaust & Ventilation Service and Repair Across NYC
When exhaust fans stall or ventilation falls out of balance, tenants notice it as stale air, lingering odors, restroom complaints and humidity. Com+ Mechanical services and repairs commercial exhaust and ventilation systems building-wide — rooftop and inline exhaust fans, energy-recovery ventilators (ERV/HRV), dedicated outdoor air systems (DOAS), dampers and controls — with 24/7 response for property managers and building owners across the five boroughs and surrounding metro.
Common Exhaust & Ventilation Problems We Resolve
Exhaust fan not running or barely moving air
A tripped overload, failed capacitor, seized bearing, snapped or glazed belt, or a burned-out motor. We test the fan under load and check the drive rather than just cycling power, so the unit doesn't fail again next week.
Restroom or corridor odors and lingering humidity
Toilet and general exhaust that has lost airflow — clogged grilles, a fan running backward after a phase swap, a stuck backdraft damper, or branch ductwork that has come apart in the ceiling. The space goes under-ventilated and odor and moisture sit.
Doors slamming, whistling, or hard to open
The building has gone net positive or negative because exhaust and make-up/supply air no longer match — a down fan, a stuck damper, or a system that was never rebalanced after a tenant fit-out. We measure pressure and rebalance the air.
ERV/HRV not recovering or icing up
A fouled or frozen energy-recovery core, a stalled enthalpy wheel, failed defrost or economizer controls, or plugged filters. The unit stops recovering heat and either over-ventilates, under-ventilates, or trips on freeze protection.
Garage CO/NO2 alarm or fans cycling oddly
Failed CO or NO2 sensors out of calibration, a fan that won't stage up on demand, or a controls fault leaving the garage either under-ventilated (alarm risk) or running full-speed 24/7 and wasting energy.
Excessive noise, vibration, or roof leaks at the fan
Worn bearings, an unbalanced wheel, loose isolation, or a deteriorated roof curb, flashing or backdraft damper letting water and weather in below the unit. Left alone these progress to motor failure and interior damage.
Exhaust & Ventilation Service Built for Commercial Buildings
Ventilation is the system tenants only notice when it fails — restrooms that hold odor, corridors that feel stuffy, garages that set off CO alarms, mechanical rooms that overheat, and floors that go negative or positive enough to slam doors and whistle through elevator shafts. Com+ Mechanical services the full commercial exhaust and ventilation chain across NYC office, retail, multifamily, parking and mixed-use buildings: rooftop and wall-mounted exhaust fans, inline and utility-set fans, general and toilet exhaust, stairwell and elevator pressurization, garage exhaust and CO control, and the energy-recovery ventilators (ERV/HRV) and dedicated outdoor air systems (DOAS) that bring code-required fresh air to the building. We diagnose airflow at the actual cause — a seized bearing, a slipping belt, a failed VFD, a stuck damper actuator, a clogged ERV core or a controls fault — and rebalance the building so supply, return and exhaust match the way the design and code (ASHRAE 62.1) intend. You get documented findings and a clear path to resolution, not a fan that was simply reset.
What Our Exhaust & Ventilation Service Covers
Why Property Managers Call Com+ for Ventilation Service
Our Simple Process
From call to comfort in 4 easy steps
Dispatch & system assessment
We confirm access, safety and equipment details, then get a technician to the fans, ERV/DOAS and affected spaces to assess the failure.
Root-cause diagnosis & airflow check
We test motors, drives, dampers and controls under load and measure airflow and pressure to find the true cause — not just the symptom.
Scope, quote & approval
You get a documented scope with photos and a clear price before work proceeds. No surprise invoices.
Repair, rebalance & verify
We complete the repair, rebalance supply/return/exhaust, verify airflow and controls, and leave the system logged and labeled for your records.
Types of Systems We Install
Exhaust & Supply Fans
Rooftop, wall-mounted, inline and utility-set fans handling toilet, general, garage and mechanical-room exhaust and supply air.
- •Belt, bearing & motor service
- •VFD and starter diagnostics
- •Backdraft & motorized damper repair
Energy-Recovery Ventilators (ERV/HRV)
Enthalpy-wheel and plate-core units that recover heat and moisture from exhaust to temper incoming fresh air — central to efficient ventilation.
- •Core/wheel cleaning & replacement
- •Defrost & economizer control testing
- •Filter and condensate service
Dedicated Outdoor Air Systems (DOAS)
Units that deliver and condition code-required outdoor air independently of the building's heating and cooling, often paired with VRF or fan-coils.
- •Outdoor-air damper & sensor service
- •Supply-fan & VFD diagnostics
- •Ventilation airflow verification
The Com+ Mechanical Difference
Commercial-only focus
We work on building ventilation every day across NYC — exhaust fans, ERVs and DOAS — not the occasional residential bath fan.
Built for property managers
Clear documentation, a single point of contact, and coordination with your building staff and tenants.
Whole-portfolio coverage
One vendor for one fan or every ventilation system across multiple buildings and boroughs.
Maintenance that prevents the next call
Every repair comes with a preventive-maintenance recommendation to cut emergency failures and keep airflow on spec.
Transparent Pricing
No fees. No surprises. Just honest service.
Repair & Rebalance
Approved repair scoped to the failed components, with the building rebalanced.
- Parts and labor scoped to the fault
- Supply, return and exhaust rebalanced to design
- Airflow and controls verified after repair
- Workmanship backed
Maintenance Agreement
Planned ventilation maintenance to cut emergency failures across your portfolio.
- Scheduled belt, bearing, filter and ERV-core service
- Priority emergency response
- Portfolio-wide reporting
- See our Building Comfort maintenance plans
Pricing shown is a structure, not a quote. Final pricing is confirmed in writing after assessment.
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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Don't see your brand? We service all major manufacturers! Call us to confirm.
Proudly Serving Nassau County
Fast, reliable service in your neighborhood
Frequently Asked Questions
Get answers to common questions about our services
Do you offer 24/7 emergency exhaust and ventilation repair in NYC?
Yes. A down exhaust fan, a building gone negative, or a triggered garage CO alarm can't wait for business hours, so we provide 24/7 emergency commercial response across the five boroughs and surrounding metro.
What types of exhaust and ventilation equipment do you service?
We service rooftop and wall-mounted exhaust fans, inline and utility-set fans, general and toilet exhaust, stairwell and elevator pressurization, garage exhaust and CO control, and energy-recovery ventilators (ERV/HRV) and dedicated outdoor air systems (DOAS) — from manufacturers including Greenheck, Loren Cook, Twin City Fan and RenewAire.
Can you rebalance airflow after a tenant fit-out or build-out?
Yes. Renovations frequently throw a floor out of balance — added exhaust, relocated diffusers or capped returns leave the space net positive or negative. We measure airflow and building pressure and rebalance supply, return and exhaust so the floor meets design and ASHRAE 62.1 ventilation requirements.
Can you service ventilation across multiple buildings?
Yes. We support property-management companies and owners with multi-site portfolios, giving you one vendor, consistent documentation, and coordinated scheduling across buildings and boroughs.
How does ventilation service affect Local Law 97 and energy costs?
Fans run continuously, so failed drives, fixed-speed operation and bypassed energy recovery quietly waste energy. Restoring VFD control, demand-based ventilation and a working ERV/HRV cuts fan and conditioning load, which supports your building's emissions targets. For aging equipment we'll show how upgrades affect efficiency and Local Law 97 exposure.
Do you coordinate roof access and building requirements?
Yes. We coordinate with building staff on roof access, COIs, tenant notice and safety requirements before mobilizing.
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Ventilation Off? Get a Technician On Site.
Tell us the building, the system and the symptom — a stalled fan, an odor complaint, a CO alarm or a floor out of balance — and we'll dispatch, diagnose and rebalance the air. Serving property managers and building owners across the NYC metro, 24/7.
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