Air Filtration for Spray Booths: What to Consider Before You Specify

Spray booth filtration does more than catch overspray. The filters you choose can affect airflow balance, finish quality, maintenance effort and how well the booth fits the site’s ventilation requirements.

Before you specify a system, it helps to look at the full picture: what is being sprayed, how the booth is ventilated, how much overspray is expected, and what the end result needs to look like.

Start with the coating process and overspray load

Not every spray booth behaves the same way. The type of coating, the application method and the volume of work all influence what the filtration needs to do.

If a booth regularly handles heavy overspray, the filter arrangement needs to capture and hold more particulate without choking airflow too quickly. If the work is lighter or more controlled, the specification may be different.

Things to consider include:

• •the type of paint, primer, lacquer or coating being applied
• •whether the booth is used for small parts, panels, vehicles or mixed jobs
• •how much overspray is created during normal operation
• •whether the booth is downdraft, side draft or crossdraft
• •whether there are separate stages for intake, booth protection and exhaust capture

The right filtration setup often uses more than one stage. For example, intake filtration can help protect the booth and support cleaner air entering the space, while exhaust filters are selected to capture paint particles before discharge or recirculation, where applicable.

Match filtration to airflow and booth performance

Airflow is central to spray booth performance. If filters load up too quickly or are too restrictive for the system, the booth can lose balance and the working conditions inside the booth may change.

That is why pressure drop matters. A filter with the wrong resistance can place unnecessary load on the fan and make it harder to maintain the airflow the booth was designed for. On the other hand, a filter that is too open may not capture overspray effectively.

When specifying filters, check:

• •the airflow requirements of the booth and fan system
• •the available filter face area
• •whether the filter stage is acting as pre-filter, final filter or exhaust media
• •how the booth operator will know when filters are becoming loaded
• •whether pressure gauges or other monitoring points are fitted

If gauges are fitted, monitor pressure drop as part of normal operation. Inspection frequency depends on the system, site conditions and dust load, and you should follow the filter and equipment manufacturer instructions.

For replacement planning, it also helps to measure the filter correctly before ordering. Our guide on how to measure an air filter is a useful starting point when checking sizes and fit.

Think about finish quality, not just capture

A spray booth filter should do more than trap particles. It also needs to support the finish you are trying to achieve.

If incoming air carries too much dust or debris, that can affect the final surface. If exhaust filtration does not control overspray well, particles may build up on booth surfaces or interfere with the work environment. The goal is a stable, predictable airflow path with filtration that matches the finish standard expected by the team.

In practice, this means looking at:

• •how clean the intake air needs to be for the coating process
• •whether the booth requires a finer final stage to help limit airborne dust
• •how often the booth is cleaned and how much debris the filters need to hold
• •whether the product chosen sheds fibres or releases particles as it loads

Some filter media are better suited to fine particulate capture, while others are designed for higher dust holding. The best choice depends on what matters most in the booth: airflow stability, particle capture, or a balance of both.

If you are comparing product options, our our products page is a good place to review the range we supply.

Consider compliance and site requirements early

Spray booth filtration is part of a broader ventilation system, so it should be considered alongside the booth design and site obligations.

In Australia, ventilation requirements may involve AS 1668.2:2024, but the right interpretation depends on the application and the building setup. Site requirements should be confirmed with the mechanical services engineer or building owner.

It is also worth checking whether any local or project-specific requirements apply to:

• •exhaust discharge arrangements
• •fire and safety controls around the booth
• •access for servicing and safe filter change-out
• •containment of overspray and cleaning residues
• •the compatibility of filters with the equipment manufacturer’s instructions

A good specification should support the booth design rather than work against it. If a filter is too restrictive, too fragile for the application, or difficult to maintain, it can create operational problems later.

Plan for maintenance and replacement access

Even the right filter will eventually load up with paint and airborne particulate. That is normal, so the booth should be set up with maintenance in mind.

When specifying filters, ask how easy they are to inspect, remove and replace. In busy paint environments, access and handling matter just as much as capture performance.

Useful questions include:

• •Can the filter be changed without disturbing other parts of the booth?
• •Is there enough clearance for safe removal and fitment?
• •Are replacement sizes standard or do they need to be made to suit?
• •Is the filter media suitable for the dust and overspray level at the site?
• •Do the manufacturer instructions mention any special installation details?

Some filters are designed to be washable - check the product instructions before assuming a filter can be reused. Where washable products are used, follow the manufacturer’s guidance carefully, because cleaning methods can affect performance and fit.

If your booth needs a non-standard size or format, custom air filters can help when standard products are not the right match.

Get the specification right before you order

Before you place an order, it is worth confirming the basics with the booth operator, contractor or mechanical services team:

• •booth type and dimensions
• •intended coating process
• •expected overspray load
• •airflow target and fan capacity
• •filter stage locations and access points
• •monitoring method, including pressure drop where fitted

If the booth is part of a broader commercial site, ongoing filter servicing or commercial filter servicing can also help keep the system maintained in line with the site’s needs.

At Total Air Filtration, we are a family-owned air filter manufacturer and supplier based in Hillcrest, Brisbane QLD, established in 2009. We work with spray booth operators, contractors and paint finishing teams to help identify the right filter type, size and format for the application.

Talk to Total Air Filtration

If you need help selecting spray booth filters, Total Air Filtration can supply or make the right filters for your setup. Call us on 07 3800 3448 or request a quote.

You can also contact us to discuss a project, or view industries we supply for more context on the sectors we support.