Choosing Filters for a Tenanted Office Floor With Open Plan and Meeting Rooms

Managing air filtration on a tenanted office floor is rarely a one-size-fits-all task. Open plan work areas, enclosed meeting rooms, reception spaces and copy points can all place different demands on the HVAC system, with dust load and occupancy changing from zone to zone.

The right filter approach depends on how the floor is used, what the plant can handle, and what the building owner or mechanical services engineer specifies for the system. If you are responsible for day-to-day facilities decisions, it helps to think in zones rather than treating the whole floor as identical.

Start with how each area is used

The first step is to map the floor by activity, not just by tenancy boundary. An open plan area may have steady background occupancy, while meeting rooms may sit idle for periods and then fill quickly. Rooms near entry points, printer stations or kitchenettes can collect more dust and lint than quieter parts of the floor.

A simple zone review can help you decide where a standard pre-filter is enough and where a finer final filter may be worth considering. It is also useful when you are speaking with the building owner or mechanical services engineer about what the system can support.

Think about:

• •how many people use each space
• •whether the space is occupied all day or only intermittently
• •whether doors stay open or closed
• •whether the area is close to streets, loading areas or high-traffic foyers
• •whether there are printers, food areas or other dust sources nearby

This kind of review gives you a clearer picture of the dust load, which is more useful than assuming every part of the floor needs the same filter grade.

Match filter choice to the zone

For many office floors, the best approach is a layered one. A coarser pre-filter can capture larger particles and help protect the main filter, while a finer final filter can be used where the system and site requirements call for it.

Open plan work areas

Open plan spaces often benefit from a balanced setup that captures everyday dust without overloading the HVAC system. Where the plant is designed for it, a mid-grade final filter can be a practical choice. If the system uses EN classes, you may still hear people refer to G3/G4 or F5-F9, even though EN 779 has been superseded by ISO 16890. If you are comparing products across different rating systems, remember that MERV, EN 779 and ISO 16890 do not convert directly.

In open plan areas, ask whether the filter is mainly there to trap general dust and lint, or whether the zone has special needs because of nearby works, high traffic or sensitive equipment.

Meeting rooms

Meeting rooms often have a different pattern of use. A room may be vacant for hours, then occupied by several people at once. That changing occupancy can affect particle levels and how fast the system loads up with dust.

If a meeting room has its own supply air path or local fan coil unit, check whether a finer filter is appropriate for that equipment. If the room shares a larger central system with the rest of the floor, the filtration strategy may need to be kept consistent with the wider plant design.

For spaces that are used for long meetings or board sessions, some managers choose to prioritise cleaner supply air through the filter selection, while still staying within the limits of the system and the manufacturer instructions.

Reception, breakout and printer areas

These spaces often see the highest foot traffic and the most airborne dust from movement, paper handling and adjacent entry doors. They may need closer inspection than quiet office zones.

Breakout areas can also introduce odour and grease concerns if food is prepared nearby. Air filters do not remove every odour source, but they can help capture particles that carry dust and lint through the system.

Consider the whole system, not just the filter media

The best filter choice still needs to work with the fan, housing, seals and access arrangement. A filter that fits loosely or bends in the frame can let dust bypass the media and reduce performance.

Before changing grades or brands, check:

• •the filter dimensions and frame type
• •available space in the filter rack
• •the fan’s ability to handle additional resistance
• •whether the housing seals properly
• •whether there are pressure gauges or other indicators already installed

If you need help measuring an existing filter correctly, our guide on how to measure an air filter is a useful starting point.

Where the building is governed by specific ventilation requirements, AS 1668.2:2024 may be relevant. Site requirements should always be confirmed with the mechanical services engineer or building owner before changing the filter arrangement.

Plan maintenance around dust load and access

On a tenanted floor, the practical challenge is often not choosing a filter, but maintaining it without disrupting occupants. Inspection frequency depends on the system, site conditions and dust load, so there is no fixed schedule that suits every office.

A good maintenance plan should consider:

• •whether the floor is occupied during business hours only or extended hours
• •whether cleaning practices create extra airborne dust
• •whether recent tenancy changes have altered room usage
• •whether pressure drop gauges are fitted and easy to read
• •whether access to the filter rack is straightforward or restricted

If gauges are fitted, monitor pressure drop and use that reading alongside visual inspection. Follow the filter and equipment manufacturer instructions when deciding whether a filter should stay in service, be cleaned if the product allows it, or be replaced.

Some filters are designed to be washable - check the product instructions before assuming a filter can be reused.

For buildings where maintenance is handled centrally, commercial filter servicing can make it easier to keep different zones on the same management plan.

When higher efficiency filters make sense

There are situations where a higher efficiency filter is worth considering, but it should be based on plant capability and site needs rather than using the highest grade available by default.

You may want to discuss finer filtration if:

• •the floor has persistent dust ingress from nearby construction or heavy external traffic
• •certain rooms generate more fine dust than the rest of the tenancy
• •the building owner wants a consistent filtration standard across multiple tenancies
• •the HVAC system has enough capacity for the added resistance

If HEPA is being discussed, make sure the specification is clear. Under EN 1822, H13 filters are at least 99.95% efficient at the most penetrating particle size, and H14 filters are at least 99.995% efficient at MPPS. These are specialised products and are not automatically suitable for every office system.

If you are uncertain whether a standard panel filter, a pleated filter or a higher efficiency product is the right fit, our our products page is a good place to start.

Choosing a supplier who can match the building, not just the size

Tenanted office floors often need more than a catalogue match. You may need a standard replacement, a custom size, or a different approach for separate zones on the same floor.

As a family-owned air filter manufacturer and supplier in Hillcrest, Brisbane QLD, established 2009, Total Air Filtration works with office managers, maintenance teams and building operators who need practical filter advice without the jargon. If the existing filter no longer fits the way the floor is used, custom air filters may be the simplest way to get a better match.

What to have ready before you enquire

• •the current filter dimensions
• •the filter rating or product type in use now
• •photos of the filter rack and access point
• •notes on which rooms see the most traffic or dust
• •any pressure drop readings already available

Talk to Total Air Filtration

If you need help choosing filters for an open plan office with meeting rooms, we can help assess the application and supply the right product for the system and the zone.

Call 07 3800 3448 or request a quote. You can also contact us if you want to talk through a replacement filter, a custom size or a servicing plan.