Air Filtration for Panel Beating Shops Using Dry Sanding Booths

Panel beating shops that use dry sanding booths face a particular filtration challenge. Body filler dust, primer residue and fine sanding particles can be light enough to travel beyond the work area, especially where dry sanding spaces share HVAC or exhaust ductwork with other parts of the workshop.

Choosing the right filters is less about one universal product and more about matching the dust load, airflow pattern and maintenance access to the way the shop actually operates.

Why dry sanding areas need careful filtration

Dry sanding generates a very fine mix of particles that can quickly load filters if the system is undersized or poorly arranged. In a panel shop, that dust may come from hand sanding, orbital sanding, filler finishing and surface prep, and it often includes a range of particle sizes.

When those particles enter a shared system, a filter has to do more than protect one booth. It may also be supporting:

• •general workshop supply air
• •local extraction from sanding bays
• •return air systems that recirculate part of the conditioned air
• •exhaust systems that discharge outdoors

That is why filter selection should be based on the complete airflow path, not just the booth itself.

Start with the system layout

Before choosing replacement filters, it helps to understand where the dust is being captured and where the air goes next. A dry sanding booth may have one stage of filtration, or it may rely on multiple stages across pre-filtration, final filtration and exhaust treatment.

For panel beating shops, the key questions are:

• •Is the sanding area exhausting directly outdoors, or feeding into shared ductwork?
• •Does the system recirculate any air back into the workshop?
• •Are there pre-filters upstream of finer filters?
• •Is the fan and duct arrangement designed for a higher dust load?
• •Are there pressure gauges or other indicators showing when filters are loading up?

If the answer to any of those questions is unclear, it is worth checking the mechanical drawings or speaking with the mechanical services engineer or building owner. If the installation needs to align with ventilation requirements, AS 1668.2:2024 is a useful reference point, but site requirements still need to be confirmed for the specific system.

Common filter choices for panel shops

Pre-filters for heavier loading

In many panel shops, a coarse pre-filter is the first line of defence. Its job is to catch larger dust and debris before they reach finer stages downstream. This can help keep the rest of the system cleaner for longer, especially where sanding happens throughout the day.

Depending on the equipment, pre-filters may be supplied in panel, pad or pocket-style formats. The right option depends on how the filter frame is built, the airflow direction and how much dust the system carries.

Mid-stage filters for fine dust

Dry sanding dust is often fine enough that a coarse filter alone will not be enough. In shared HVAC or workshop air systems, a finer filter stage is often needed to capture smaller particles before they reach supply air grilles, fans or sensitive duct components.

In Australia, it is still common to hear filters described using older EN 779 classes such as G3, G4 or F5 to F9, even though ISO 16890 has superseded that system. These ratings do not convert directly, so the safe approach is to match the filter to the actual application rather than rely on a simple cross-reference.

If you are comparing options, look at the filter media, airflow resistance, dust holding behaviour and how the product fits the existing frame or housing.

Final filtration where cleaner air is needed

Some systems need a finer final filter stage, particularly if the booth discharges through shared HVAC components or if the workshop wants more control over the dust that continues downstream. Final filtration is often chosen for the last stage before air is supplied back into occupied or finished areas.

That does not automatically mean a very high-efficiency filter is required. The right final filter depends on the system design, pressure capacity and maintenance access. In some applications, a staged approach works better than trying to do everything with one very fine filter.

When HEPA is relevant, and when it is not

HEPA filtration is not automatically the right answer for every panel shop. It is usually considered where the system design calls for very high particle capture and where the housing, airflow and maintenance arrangement are built for it.

If HEPA is being specified, it is important to use the correct EN 1822 rating. H13 filters are at least 99.95% efficient at the most penetrating particle size, and H14 filters are at least 99.995% efficient at the MPPS. Those figures are specific to that standard and should not be mixed up with general efficiency claims from other rating systems.

For many dry sanding booths, the better question is not whether HEPA is available, but whether the system actually needs that level of filtration and whether it can maintain airflow with the added resistance. That is something to confirm with the mechanical services engineer or equipment supplier.

Maintenance matters as much as the filter type

Even a well-chosen filter will struggle if it is installed in the wrong place, sealed poorly or left in service after loading up with dust. In panel shops, the amount of sanding and the type of filler used can change the dust load quickly, so filter condition needs to be checked regularly.

Inspection frequency depends on the system, site conditions and dust load. Where gauges are fitted, monitor pressure drop and follow the filter and equipment manufacturer instructions rather than relying on a fixed calendar schedule.

Useful maintenance points include:

• •checking seals and frame fit during changeout
• •confirming airflow direction before fitting new media
• •inspecting ductwork for dust build-up or bypass leakage
• •keeping spare filters on hand for the correct dimensions and rating
• •recording which stage is loading first so the system can be adjusted if needed

Some filters are designed to be washable - check the product instructions before cleaning or reusing them.

Custom sizes and workshop-specific filter solutions

Many panel beating shops are working with older buildings, modified booths or mixed-use mechanical systems. That means off-the-shelf filter sizes are not always the best fit. A custom filter can be a practical option when the frame dimensions, airflow path or dust loading pattern are unusual.

If the system uses non-standard housings, it is worth measuring the existing filter carefully before ordering replacements. Our how to measure an air filter guide can help avoid simple sizing mistakes that lead to bypass, poor sealing or unnecessary rework.

For shops that need a tailored setup, custom air filters can be made to suit existing equipment and local conditions. We also supply a wide range of our products for commercial and workshop applications.

Choosing a supplier who understands workshop realities

The best filter arrangement for a panel shop is usually the one that fits the booth, handles the dust load and can be serviced without disrupting the whole workshop. That means thinking about access, sealing, pressure drop, changeout practicality and whether the system feeds shared HVAC or exhaust equipment.

At Total Air Filtration, a family-owned air filter manufacturer and supplier in Hillcrest, Brisbane QLD, we work with businesses and contractors who need practical filtration solutions for demanding workshop environments. We can help assess the application, match the filter type to the system and supply replacements to suit.

For help with a dry sanding booth, workshop exhaust or shared HVAC filter setup, call 07 3800 3448 or request a quote.

You can also contact us or explore the industries we supply if you are planning filtration across more than one area of the workshop.