How to Choose Paint Booth Intake and Exhaust Filters: Dust, Overspray & VOC Control

Choosing the right paint booth filter is not simply a matter of finding the correct size.

Although intake and exhaust filters are both commonly called “spray booth filters,” they perform very different functions.

Paint booth intake filters help reduce dust and airborne particles entering the spray area, protecting the coating surface from contamination.

Paint booth exhaust filters, also known as paint arrestor filters or overspray filters, capture paint mist and overspray particles before the exhaust air leaves the booth.

VOC control is another issue entirely.

If a purchasing inquiry simply says, “We need paint booth filters,” without specifying the installation location, airflow direction, contaminant type, and operating conditions, the supplied filter may physically fit the equipment but still be unsuitable for the application.

Quick Answer: Where Should a Paint Arrestor Filter Be Installed?

A fiberglass paint arrestor filter is typically installed on the exhaust side of a dry-type spray booth to capture paint overspray carried by the exhaust airflow.

In a crossdraft booth, exhaust filters are generally located opposite the intake filters. In a downdraft booth, exhaust filtration may be located at or near floor level.

The intake side requires different filter media selected according to the required supply-air cleanliness and coating quality.

Before selecting a filter, always confirm the booth airflow design, filter location, holding-frame dimensions, and equipment manufacturer’s requirements.

Paint Booth Airflow Comes First

Before choosing any filter, identify the airflow path:

Outside / Make-up Air → Intake Filtration → Spray Area → Overspray Capture → Exhaust System

This simple airflow path explains why one filter cannot automatically perform every filtration function.

The intake side focuses primarily on keeping contaminants out of the painting area.

The exhaust side focuses on capturing paint overspray before contaminated air leaves the booth.

VOC treatment, when required, involves a separate gas-phase pollution-control strategy.

Intake Filters: Protecting the Coating from Dust

Make-up air entering a paint booth may contain dust and other airborne particles.

If these particles reach a freshly painted surface before the coating has cured, they can contribute to surface defects and increase rework requirements.

The purpose of a paint booth intake filter is therefore to reduce particulate contamination while maintaining the designed airflow volume and distribution.

For applications requiring a high-quality surface finish, attention should also be given to:

• Filter efficiency
• Pressure drop
• Airflow uniformity
• Filter sealing
• Ceiling filter condition
• Holding-frame integrity

Even a suitable filter can perform poorly if the edges are not properly sealed.

Bypass leakage allows unfiltered air to enter the spray area without passing through the filter media.

Exhaust Filters: Capturing Paint Overspray

During spray painting, not all coating material reaches the workpiece.

Some becomes airborne paint mist or overspray and travels with the exhaust airflow.

A paint arrestor filter is designed to capture these paint droplets and particles before the air enters downstream exhaust equipment or is discharged from the booth.

Common terms used for this type of filtration include:

Paint Arrestor Filter
Paint Overspray Filter
Spray Booth Exhaust Filter
Fiberglass Paint Arrestor
Paint Booth Fiberglass Filter

Fiberglass media is widely used for this application because its progressively structured fibers can provide good paint-holding capacity while maintaining relatively low airflow resistance.

Hencolin’s Fiberglass Filter Media Rolls and Pads for Spray Paint Booths are designed for applications including dry painting booths and automotive paint booth exhaust systems.

The media can be supplied in rolls or cut into pads according to installation requirements.

Paint Overspray Filtration and VOC Control Are NOT the Same

This distinction is especially important when specifying a paint booth filtration system.

Paint overspray is particulate contamination.

Paint arrestor filters physically capture droplets and particles carried by the exhaust airflow.

VOCs are gaseous contaminants.

Volatile Organic Compounds may be generated by paints, coatings, thinners, solvents, and cleaning chemicals.

Conventional fiberglass paint arrestor media should not automatically be considered a VOC-removal filter.

In other words:

Paint Arrestor Filter ≠ VOC Filter

If the process requires control of both overspray and VOCs, they should be treated as two separate engineering requirements.

The following information should be evaluated:

• Type of paint or coating
• Target VOC compounds
• VOC concentration
• Exhaust airflow volume
• Operating temperature
• Required removal efficiency
• Local environmental requirements
• Upstream overspray loading

Depending on the application, VOC treatment may require technologies such as activated carbon or other dedicated gas-phase treatment systems.

The appropriate solution should be determined according to the actual contaminant and process conditions.

How to Compare Paint Arrestor Filters

Price per roll should not be the only purchasing criterion.

A more meaningful technical comparison should include the following factors.

1. Filter Dimensions and Thickness

Confirm the actual:

• Width
• Height
• Thickness
• Holding-frame dimensions
• Required pad dimensions

For roll media, also consider cutting losses when calculating annual consumption.

2. Airflow and Face Velocity

Filter pressure drop depends on airflow conditions.

When comparing technical data from different suppliers, check whether the stated pressure-drop values were measured under comparable face velocities.

A pressure-drop number without its test condition provides limited value for engineering comparison.

3. Paint-Holding Capacity

A paint arrestor must capture overspray while maintaining acceptable airflow.

Actual service life can vary depending on paint type, transfer efficiency, spraying volume, booth configuration, and operating conditions.

4. Initial and Final Pressure Drop

As overspray accumulates, airflow resistance generally increases.

Recording the pressure differential when a new filter is installed provides a useful baseline for future maintenance.

5. Installation and Sealing

Filter performance depends not only on the media itself but also on installation quality.

Improper fixing, gaps around the filter frame, incorrect sizing, or damaged media may allow contaminated air to bypass the filter.

When Should Paint Booth Filters Be Replaced?

There is no universal answer such as “every three months” that applies to every paint booth.

Replacement frequency depends on actual operating conditions.

Factors include:

• Daily spraying volume
• Type of coating
• Transfer efficiency
• Booth airflow
• Filter surface area
• Overspray loading
• Fan operation
• Pressure differential

A practical maintenance program should combine pressure-drop monitoring, airflow condition, visual inspection, production volume, and historical replacement records.

If exhaust filters become excessively loaded, airflow through the booth may be affected.

This can contribute to uneven airflow, overspray recirculation, increased fan load, and potential coating-quality problems.

Information to Provide When Requesting a Paint Booth Filter Quotation

To obtain a more accurate quotation, provide more than just filter dimensions.

For international buyers, coating-line manufacturers, and engineering contractors, the following information can significantly improve filter selection:

Application: Intake filtration or exhaust overspray filtration
Booth Type: Crossdraft, downdraft, semi-downdraft, or other design
Filter Location: Intake / Ceiling / Exhaust / Floor
Dimensions: Width × Height × Thickness
Airflow: CFM or CMH
Face Velocity: m/s, if available
Paint Type: Water-based, solvent-based, powder coating, etc.
Current Filter: Material and specification
Pressure Drop: Initial/current value, if available
Replacement Frequency: Current maintenance interval
Supply Format: Roll or pre-cut pads
Quantity: Monthly or annual consumption

Photos of the existing filter and installation frame can also help suppliers identify the correct configuration.

FAQ: Paint Booth Filters

What is the difference between an intake filter and an exhaust filter in a paint booth?

An intake filter reduces dust and particles entering the spray area, while an exhaust filter captures paint overspray leaving the spray area.

They serve different purposes and should be selected according to their installation position and contamination-control requirements.

Where is a fiberglass paint arrestor installed?

Fiberglass paint arrestor media is commonly installed on the exhaust side of dry-type spray booths.

Its purpose is to capture paint mist and overspray particles carried by the exhaust airflow.

Can a paint arrestor filter be used as an intake filter?

Filter selection should follow the booth design and required air cleanliness.

A fiberglass media specifically selected for paint overspray capture should not automatically be treated as the appropriate intake filter.

Does a fiberglass paint arrestor remove VOCs?

Conventional paint arrestor media primarily captures paint droplets and particulate overspray.

VOC control is a gas-phase contamination issue and should be evaluated separately.

Can activated carbon remove VOCs from paint booth exhaust?

Activated carbon can adsorb certain gaseous contaminants and VOCs, but performance depends on the specific compound, concentration, humidity, temperature, contact time, carbon quantity, and system design.

A carbon filter should therefore be selected according to actual operating conditions rather than simply added as an additional filter layer.

How often should a paint booth exhaust filter be changed?

There is no fixed interval suitable for every installation.

Replacement should be determined using pressure-drop trends, overspray loading, airflow performance, operating hours, production volume, and the paint booth manufacturer’s maintenance requirements.

Can fiberglass filter rolls be cut to any size?

Roll media can be cut to fit many applications, but the required thickness, support structure, airflow direction, sealing, fixing method, and installation space must still be confirmed.

Choose a Paint Booth Filter by Function, Not Just by Size

When selecting a paint booth filter, start with three questions:

1. Where will the filter be installed?
Intake, ceiling, exhaust, or another section?

2. What needs to be captured?
Dust, paint overspray, or gaseous contaminants such as VOCs?

3. What airflow conditions must be maintained?
Airflow volume, face velocity, pressure drop, and final resistance all affect filter selection.

For intake filtration, the priority is typically dust control and supply-air cleanliness.

For exhaust filtration, the priority is typically paint overspray capture and stable exhaust airflow.

For VOC control, a separate gas-phase treatment strategy may be required.

Clearly separating these three requirements helps purchasing teams, paint booth manufacturers, and engineering contractors compare specifications more accurately and select filtration solutions based on actual operating conditions.

Hencolin Fiberglass Paint Arrestor Filter

Hencolin supplies fiberglass paint arrestor filter media in rolls and cut-to-size pads for dry spray booths, automotive painting systems, and industrial coating applications.

Available specifications and operating conditions should be confirmed according to the actual paint booth design, airflow, filter dimensions, and coating process.

For OEM, ODM, customized sizes, or paint booth filtration inquiries, please provide your existing filter dimensions, installation photos, airflow information, and application requirements to help determine a suitable filtration solution.