Office air filtration works best when the building's HVAC system and room-level air cleaners are treated as different parts of the same plan.

The HVAC system can provide filtration as air moves through the building.

A commercial HEPA air purifier can provide additional filtration inside specific offices, meeting rooms, reception areas, or open workspaces.

For most offices, the main questions are:

The goal is not to put an air purifier in every corner.

It is to provide enough well-distributed filtration for the office spaces that actually need it.

What Does Office Air Filtration Do?

Air filtration removes particles from indoor air as that air passes through a filter.

In an office, airborne particles may include:

• Dust
• Pollen
• Fine particulate matter
• Smoke particles
• Mold spores
• Other airborne particles

Two common filtration approaches are:

HVAC filtration
Filters air as it moves through the building's central heating and cooling system.

Room-level HEPA filtration
Uses a separate fan and filter to clean air inside a particular room or area.

These approaches can work together.

Start With the Existing HVAC Filtration

Before buying standalone air purifiers, find out what the office HVAC system is already doing.

Ask:

• What filter is currently installed?
• What is its MERV rating?
• Is it properly fitted?
• When was it last replaced?
• Can the HVAC system support a higher-efficiency filter?

CDC recommends upgrading central HVAC filtration to MERV 13 or better when compatible with the system and checking that filters fit properly so air does not bypass them.

EPA gives similar guidance for offices and commercial buildings: use the highest-efficiency HVAC filter that the system can accommodate.

This does not mean every office should simply install the highest MERV filter available.

The HVAC system still needs to maintain proper airflow.

For a deeper comparison, see our guide to HEPA vs. MERV filtration.

When Does an Office Need Supplemental HEPA Filtration?

A commercial HEPA air purifier can make sense when the office needs more particle filtration than the central system alone is providing.

Examples include:

• Busy meeting rooms
• Reception areas
• Shared open offices
• Private offices with limited airflow
• Medical offices
• Spaces where outdoor-air ventilation is difficult to increase
• Areas affected by outdoor particulate pollution or smoke
• Rooms where additional filtration is desired

EPA specifically recommends considering portable air cleaners as a supplement to HVAC ventilation and filtration in commercial buildings, especially where adequate ventilation is difficult to achieve.

CDC also recommends portable or built-in HEPA systems for supplemental workplace air cleaning.

Why HEPA Filtration?

HEPA is designed for high-efficiency particle capture.

EPA defines HEPA filtration as capable of theoretically removing at least 99.97% of airborne particles at 0.3 microns.

For an office, HEPA can therefore provide additional filtration for airborne particles without requiring the building's central HVAC system itself to use a HEPA filter.

That distinction is useful.

rather than trying to push HEPA filtration through an HVAC system that was not designed for it.

For more detail on how the filter works, see our HEPA filtration systems guide.

Size the Air Purifier for the Office

A HEPA purifier still needs enough airflow for the room.

Do not choose an office air purifier based only on an advertised square-foot number.

Start with the room volume:

For example:

A meeting room is:

• 30 ft long
• 20 ft wide
• 10 ft high

Its volume is:

30 × 20 × 10 = 6,000 cubic feet

The purifier then needs enough airflow to process that room at the rate appropriate for the application.

For the complete calculation, see our commercial air purifier sizing guide.

TRACS also provides an air changes per hour calculator.

What Does ACH Mean in an Office?

ACH means air changes per hour.

It estimates how many times the equivalent volume of room air is processed in one hour.

The basic formula is:

Imagine the 6,000-cubic-foot meeting room above uses a purifier providing 250 CFM.

The calculation is:

250 × 60 ÷ 6,000 = 2.5 ACH

That tells you how much additional filtration airflow the purifier is providing relative to the room volume.

There is no single ACH number that is automatically right for every office.

Occupancy, ventilation, room use, and building requirements all matter.

Use ACH as a sizing and comparison tool rather than treating one number as a universal office standard.

How Many Air Purifiers Does an Office Need?

That depends heavily on the layout.

One Small Open Office

One properly sized purifier may be enough.

Large Open Office

Several units may provide better air distribution than one purifier placed at only one end of the room.

Several Private Offices

Closed rooms should usually be considered separately because air does not freely move through walls and closed doors.

Conference Rooms

Meeting rooms can have very different occupancy patterns from the rest of the office and may need their own filtration plan.

Reception Areas

Reception spaces may also need to be evaluated independently if they are separated from the main workspace.

Our guide to how many air purifiers a business needs explains the unit-count calculation and distribution question in more detail.

Open Offices Need Good Air Distribution

A large open floor plan may technically be one connected air volume, but that does not mean one purifier is automatically the best choice.

Think about:

• Room length
• Furniture
• Cubicles
• Partitions
• Doorways
• Supply vents
• Return vents
• Where people actually sit

A long open office may benefit from several filtration points.

For example, two appropriately sized units at different ends of a room can sometimes distribute filtered air more evenly than one system in a distant corner.

Conference Rooms Deserve Separate Attention

Conference rooms are different from ordinary desk areas because occupancy can change quickly.

A room may sit nearly empty for most of the day and then hold several people for a meeting.

Consider:

• Room volume
• Maximum expected occupancy
• Existing supply and return air
• How frequently the room is used
• Whether the door remains closed

A separate HEPA purifier may make sense when a conference room is enclosed and frequently occupied.

The equipment should still be sized for the room rather than chosen simply because it is marketed for offices.

Portable or Ceiling-Mounted for an Office?

Both can work.

The better choice depends on how the office operates.

Our portable vs. ceiling-mounted air purifier guide covers this decision in more detail.

Noise Matters More in Offices Than Many Buyers Expect

A purifier can meet the airflow requirement on paper but still be a poor office choice if employees find it too loud.

Office air purifiers often run for many hours near:

• Desks
• Phone calls
• Meetings
• Video conferences
• Reception areas

Before choosing a system, check the noise level at the fan speed you expect to use.

Do not size the office around maximum CFM if everyone will turn the unit down because it is too loud.

Variable fan speeds can be useful because they let the office balance airflow and sound.

Placement Matters

A portable air purifier needs clear airflow around its intake and outlet.

Avoid placing it:

• Behind furniture
• Under desks
• Inside enclosed corners
• Directly against blocked surfaces

EPA also advises considering furniture and equipment when planning office airflow and pollutant removal.

In an open office, distribute units so that filtered air can circulate through occupied areas.

For ceiling-mounted systems, placement should also consider:

• Existing supply vents
• Return vents
• Partitions
• Room shape

Installation location should support the room's airflow rather than fight against it.

Does an Office Air Purifier Replace Ventilation?

No.

This is an important distinction.

Ventilation brings outdoor air into the building and removes indoor air.

A recirculating HEPA purifier filters air that is already inside the room.

EPA describes air cleaners as an addition to source control and ventilation rather than a replacement for them.

An office air-quality plan may therefore include:

Each has a different purpose.

What About Odors and VOCs?

HEPA filtration is primarily for particles.

If an office also has:

• Odors
• Chemical vapors
• Certain gaseous pollutants

then activated carbon may be useful as an additional filtration stage.

Common office sources can include cleaning products, furnishings, adhesives, or other materials.

However, air purification should not replace source control.

If a particular product or process is causing a strong indoor-air problem, reducing or removing that source should come first.

What About UV-C?

Some commercial HEPA systems also include UV-C as an additional treatment stage.

UV-C does not replace HEPA filtration.

The TRACS commercial range combines HEPA with in-unit UV-C in several portable and ceiling-mounted systems.

For a deeper explanation of its role, see our commercial UV-C air purifier guide.

For an ordinary office buying decision, though, start with:

1. Room size
2. Airflow
3. HEPA filtration
4. Placement
5. Noise
6. Maintenance

Additional technologies come after those basics.

Which TRACS Systems Fit Office Use?

Different office layouts can point toward different configurations.

TM250 Portable Air Purifier

The TRACS TM250 provides up to 250 CFM and uses a MERV 8 carbon pre-filter, H13 HEPA filtration, and in-unit UV-C.

Its portable format can make sense for:

• Private offices
• Meeting rooms
• Reception areas
• Smaller open offices

where the airflow requirement matches the unit's capacity.

Businesses can review the TM250 portable air purifier.

TM500 Ceiling-Mounted Air Purifier

The TM500 provides 500 CFM and mounts into a standard 2 ft × 2 ft drop ceiling. Its current specifications include MERV 10 pre-filtration and H13 HEPA filtration.

It may make sense where:

• Floor space is limited
• Permanent installation is preferred
• The office has a drop ceiling
• A higher airflow level is needed

Businesses can review the TM500 ceiling-mounted system.

TM950 for Larger Office Areas

The TM950 provides 950 CFM and can be installed in larger ceiling configurations or other commercial setups.

That can make it more relevant for larger open offices where the room volume requires substantially more airflow.

The correct model should still come from the airflow calculation rather than assuming one system is best for every office.

A Simple Office Air Filtration Plan

For most offices, the decision can be simplified to six steps.

TRACS has a dedicated replacement filters and parts page for ongoing system maintenance.

What Should You Look for in an Office HEPA Air Purifier?

Before buying, compare:

HEPA Filtration

Confirm the filter efficiency.

Airflow

Make sure the CFM is appropriate for the room.

Room Volume

Include ceiling height, not just square footage.

Noise

Choose equipment employees can comfortably work around.

Placement

Make sure the room has a practical location for the purifier.

Installation

Decide whether portable or ceiling-mounted equipment makes more sense.

Maintenance

Consider how filters will be changed and how often servicing is required.

Build Quality

Commercial equipment may operate throughout the workday, so it should be suited to regular use.

Businesses wanting a broader purchasing framework can also read our commercial HEPA air purifier guide.

Common Office Air Filtration Mistakes

Buying One Purifier for the Entire Office

Walls and closed doors limit air movement.

Choosing by Square Footage Alone

Include ceiling height and room volume.

Ignoring the HVAC Filter

Room filtration should complement the building system rather than being considered in isolation.

Putting the Purifier Behind Furniture

Blocked airflow reduces how effectively room air reaches the system.

Ignoring Noise

Employees may lower or switch off equipment that is uncomfortable to work beside.

Treating Filtration as Ventilation

HEPA filtration does not provide outdoor air.

The Bottom Line

Good office air filtration does not require putting the largest purifier available into the middle of the building.

Start with the existing HVAC system.

Then identify the office spaces that need additional filtration.

For those rooms:

For many offices, the practical strategy is:

That gives the building a stronger filtration plan without expecting one piece of equipment to do every job.

Frequently Asked Questions