Filter Planning for Multi-Room Physio Practices with Shared Air Handling

In a multi-room physio practice, one air handling system can be a practical way to service several treatment rooms, reception areas and support spaces. The challenge is not just choosing the right filter, but making sure it can be accessed, checked and replaced without disrupting the day-to-day running of the practice.

A clear filter plan helps contractors and practice managers stay aligned on what is installed, where it is located, and how maintenance is recorded over time. It also makes it easier to keep the system consistent when rooms are repurposed, tenancy changes occur, or the building owner manages the mechanical services on behalf of multiple occupants.

Start with the system, not the room count

When several rooms are connected to one air handling unit, the filter arrangement should be planned around the equipment first. The number of treatment rooms matters, but so do duct layout, airflow demand, ceiling access, and the way outdoor air is introduced into the system.

Before selecting replacement filters, confirm:

• •the make and model of the air handling unit or fan coil arrangement
• •the filter frame sizes and depth available in the holding section
• •whether the unit has pre-filters, final filters, or both
• •where the filters are accessed from: plant room, ceiling void, roof space, or behind a service panel
• •whether pressure gauges or differential pressure sensors are fitted
• •whether the building owner or a mechanical services engineer sets the filter specification

For sites covered by ventilation design requirements, AS 1668.2:2024 is often part of the discussion, but site requirements should always be confirmed with the mechanical services engineer or building owner.

If you are unsure what is already installed, start with how to measure an air filter before ordering replacements.

Choose a filter setup that suits shared use

Shared systems usually need a filtration arrangement that balances air quality needs with serviceability. In practice settings, that often means a staged setup rather than relying on a single filter alone.

A common approach is to use:

• •a coarser pre-filter to capture larger dust and debris before it reaches the finer filter
• •a finer final filter suited to the system’s airflow and the intended application
• •secure, well-sealed frames so air does not bypass the filter media

The exact specification depends on the unit and how the space is used. If the practice has higher dust loads from nearby construction, more foot traffic, or ceiling void contamination, the filter selection may need to be reviewed with the contractor or mechanical services engineer.

For reference, EN 779 classes such as G3, G4 and F5-F9 are still widely used in Australia, although ISO 16890 is now the current standard family. MERV, EN 779 and ISO 16890 do not convert directly, so avoid treating one rating as a simple replacement for another.

If the system is being upgraded, look through our products to compare common commercial options, or consider custom air filters if the frame size or construction is non-standard.

Plan for access before the filters are installed

A filter can only be maintained properly if people can reach it safely. In multi-room practices, poor access is one of the most common reasons filters get overlooked or replaced inconsistently.

Good access planning should cover:

• •whether a service technician can reach the filters without entering a treatment room during patient appointments
• •whether access panels open fully and safely in the available ceiling or plant space
• •whether lighting, ladders, lockout arrangements or roof access are needed
• •whether the filter location is labelled clearly for future service visits
• •whether spare filters can be stored nearby without risk of damage or contamination

If access is awkward, the filter may still be technically suitable but difficult to maintain in practice. That can lead to rushed servicing, missed inspections, or confusion when different contractors attend the site over time.

For this reason, it can help to document the filter location with photographs, panel labels and a simple site plan. That way, a new contractor or building manager can identify the correct point of service without opening the wrong access panel or disturbing occupied rooms.

Keep maintenance records consistent across rooms

With several treatment rooms on one system, maintenance records should be tied to the plant equipment, not just to individual rooms. That avoids fragmented notes such as one room being marked as serviced while another connected space is omitted from the record.

A practical record for shared air handling should include:

• •the unit identification or asset tag
• •filter sizes, types and grades currently installed
• •the date of inspection or replacement
• •the reason for service, such as visible dust loading, damage, or pressure drop at the gauge
• •the name of the contractor or staff member who completed the work
• •any access issues, leaks, seal problems or damaged frames noted during the visit

Where gauges are fitted, monitoring pressure drop is useful for judging when filters are approaching the end of their useful service condition. The right inspection frequency depends on the system, site conditions and dust load, and should follow the filter and equipment manufacturer instructions rather than a fixed calendar rule.

For practices that use a facilities log or contractor register, keep the filter details in the same place each time. Consistent records make it easier to spot recurring issues such as fast-loading filters, poor sealing, or repeated access problems.

Consider cleaning, replacement and product type together

Not all filters are treated the same way. Some filters are designed to be washable - check the product instructions before attempting any cleaning. Others are intended for replacement only, and washing them can damage the media or reduce fit and performance.

When comparing options, ask:

• •Is the filter designed for service replacement or cleaning?
• •Does the frame fit securely without bypass gaps?
• •Will the product tolerate the dust conditions at this site?
• •Is there enough room to remove and reinstall it without bending the frame?
• •Are the filter edges and seals in good condition, or does the housing need attention as well?

If the practice has recurring odour concerns, dust migration from adjacent works, or visible contamination around return air points, it may be worth reviewing the whole filter path rather than just the final filter. The aim is to keep the system maintainable, not just to swap parts when a problem appears.

Make the servicing process easy for contractors and staff

The best filter plan is one that can be followed by whoever is on site next. In a shared system, that means leaving a clear trail for contractors and giving practice staff enough information to know who is responsible for what.

Useful steps include:

• •keeping a simple asset sheet for each air handling unit
• •labelling filter access panels clearly
• •storing approved spare filters in the correct size and orientation
• •noting any room access restrictions or after-hours service requirements
• •recording whether the site is managed by the tenant, landlord or strata body

If you are coordinating multiple areas in the same building, it can also help to align filter servicing with commercial filter servicing or broader filter servicing arrangements, especially where different contractors work on the same plant room over time.

Getting the right filter arrangement for your practice

For multi-room physio practices, shared air handling works best when the filter plan is documented, reachable and easy to maintain. That means matching the filter to the system, planning access before installation, and keeping service records tied to the actual equipment rather than to individual rooms.

Total Air Filtration is a family-owned air filter manufacturer and supplier in Hillcrest, Brisbane QLD, established 2009. We can help supply or make the right filters for your site, including non-standard sizes and replacement options for shared systems.

For assistance, call 07 3800 3448 or request a quote. You can also contact us if you need help identifying the filter in your plant room or planning a replacement visit.