Little or no supply air
Fan operation, air restrictions, dampers and controls can affect delivery. The investigation should determine why supply is missing rather than assume the fan needs replacing.
COMMERCIAL & INDUSTRIAL HVAC
Make-Up Air Unit Service in NYC & Northern NJ
Exhaust needs replacement air to work as intended. Airplex provides make-up air repair, maintenance and installation planning for NYC and Northern NJ commercial properties, addressing unit faults alongside the exhaust system and building conditions.
For an active failure, call and describe the affected spaces. Scheduling and availability are confirmed for the request.
Commercial & industrial HVAC
NYC & Northern NJ
- Exhaust operationWhich system removes air, and when?
- Make-up air unitHow replacement air is delivered and treated
- Building responseObserved airflow, temperature and pressure concerns
AT A GLANCE
Restore the air that the exhaust system removes
A make-up air unit supplies replacement air for air removed from the building. Depending on the unit, that air may also be heated or cooled. Service should review the supply unit and its relationship with exhaust, because weak extraction, uncomfortable incoming air and pressure complaints can have connected causes.
UNDERSTAND THE PROBLEM
Separate the unit fault from the air-balance problem
Make-up air is part of a system, not an isolated fan.
Incoming air is too cold or warm
The installed unit may include heating, cooling or neither. Its configuration and operating conditions determine the appropriate diagnosis.
Exhaust still performs poorly
The exhaust fan, replacement-air path and operating sequence need to work together. Repairing one unit may not correct a separate restriction or control issue.
YOUR SERVICE OPTIONS
Service that fits the installed arrangement
The repair and project decisions should be tied to the equipment and the space.
Repair and preventive care
We define fan, filter, damper and conditioning-component work against the installed model. The findings explain which items are routine care and which require corrective repair.
Change in exhaust demand
We review changes in exhaust and replacement-air needs with the building team. That establishes whether the existing unit has a fault or the changed space needs a different arrangement.
New unit or replacement
Airflow requirements, duct connections, utilities and controls belong in installation planning. Gas-fired configurations require their own qualified equipment-specific work.
Start with the exhaust system it supports
Make-up air replaces air removed from the building. Its purpose should therefore be considered alongside the exhaust equipment and the spaces they serve. An apparent problem with one unit may arise because the paired systems operate at different times or because the building arrangement has changed.
If an owner reports a new draft or difficult door operation after an exhaust alteration, that history is useful to the investigation. It does not prove a single cause, but it changes the questions to ask. A replacement-air review should explain the relationship rather than treating the supply unit as a standalone heater.
Air delivery and air treatment are separate duties
A make-up air unit may deliver outdoor air with heating or other treatment appropriate to its design. A fan running does not establish that the delivered air is suitable for the occupied area. Likewise, a heating complaint does not prove the whole unit has failed.
Ask the service findings to distinguish airflow, heating or cooling function, and control response. That makes it possible to consider a targeted component repair when appropriate. It also reveals when the original selection no longer matches the building use and a wider installation review is needed.
Check how the paired equipment starts and stops
The operating sequence matters as much as the list of components. A project should identify when replacement air is required, what equipment initiates that need, and how the relevant systems are intended to respond. The installed design determines the details; copying settings from another building is not a service plan.
After work, the handover should describe the function checked and any limitations. Merely confirming that both fans can run separately is different from confirming that the intended coordinated operation occurs. This distinction is valuable when an intermittent complaint appears only during opening, closing or a particular business activity.
What changes the installation or replacement cost
Capacity is only part of a make-up air project. Air intake and discharge arrangements, utilities, connections, controls and the route for removal or installation can change the total scope. A replacement may also require work on the system it supports, which should be visible in the proposal.
Compare proposals using the same assumptions about retained components and operating requirements. Ask whether testing of the paired systems is included and which party is responsible for any separate specialty equipment. That gives the owner a clearer choice than comparing two equipment prices with different installation responsibilities.
PLANNING THE WORK
What affects a make-up air estimate?
Unit configuration, heating or cooling components, airflow requirements and access affect the scope. For replacement, include utilities, ductwork and control coordination rather than comparing equipment prices alone.
IN YOUR BUILDING
Coordinate tenant exhaust with building equipment
Commercial spaces in NYC and Northern NJ often share roof access or other building systems. Make-up air work should account for the connected exhaust and any tenant or base-building responsibilities.
COMMON QUESTIONS
Make-Up Air Unit Service questions
Is make-up air the same as a rooftop air conditioner?
No. Make-up air is selected for replacement-air duty; a rooftop comfort system may perform a different mix of recirculation and outdoor-air functions. The actual unit configuration matters.
Can a make-up air problem affect doors or exhaust?
It can contribute to pressure and airflow complaints. Supply, exhaust and other building air paths must be evaluated together before deciding on a correction.
Can an exhaust upgrade require make-up air changes?
Yes, it may. Increasing or altering exhaust can change the replacement-air requirement and the way the building operates. Review the paired arrangement before assuming the existing supply unit remains suitable. The necessary work depends on the actual system and use, not just the horsepower of the new exhaust fan.
Does make-up air equipment replace ordinary space heating?
That depends on the design. A unit may be intended to treat incoming replacement air while other equipment handles the occupied-space load. Before combining those jobs in a replacement proposal, establish what each existing system does and what the revised arrangement must provide.
RELATED GUIDES & SERVICES
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AIRPLEX MECHANICAL
Request Make-Up Air Unit Service
Tell us what is happening and which spaces are affected. A model number or service history can help, but you do not need a complete equipment list to contact Airplex.