For painting and coating systems, it is necessary to distinguish between sanding dust, dry overspray from powder coating, pigments, deposited residues, sludge, mists and vapours. An industrial vacuum cleaner can collect dry dust and solid materials from floors, booths and tools; a dust collector is more suitable for capturing airborne particulate through hoods or benches. Paint mists, aerosols and solvent vapours instead require specifically designed ventilation and filtration systems. The configuration depends on the product applied, quantity, colour-change frequency, filtration and any ATEX classification.
Which residues are generated in painting and coating systems
Industrial painting and coating include different processes carried out on metals, wood, plastic materials, fibreglass, automotive components and products intended for many production sectors. Residues change according to the technology used and the phase of the process.
Powder coating
In powder coating, the following may be present:
- ✓ Epoxy and polyester powders
- ✓ Hybrid formulations and additives
- ✓ Pigments and dry overspray
- ✓ Residues from hoppers and cyclones
- ✓ Powder deposited in booths and filters
- ✓ Material from colour changes and surfaces
The powder is applied electrostatically to the workpiece and then polymerised in the oven. The part that does not adhere to the product becomes overspray and can settle in the booth or be intercepted by the recovery system.
Liquid painting
Liquid painting can produce:
- ✓ Sanding dust from fillers and primers
- ✓ Dry residues and solidified deposits
- ✓ Contaminated filters and booth sludge
- ✓ Uncured liquid paint
- ✓ Spray mists, aerosols and vapours
A vacuum cleaner for dust cannot automatically manage all these contaminants. Dry dust and dry solid residues can be collected with a correctly configured machine; mists, aerosols and vapours must be handled by the booth ventilation system or by systems specifically designed for the contaminant.
Industrial vacuum cleaner, dust collector and booth ventilation are not the same thing
The distinction between these three technologies is essential to avoid compromising department efficiency:
- Industrial vacuum cleaner: The industrial vacuum cleaner generally works with high vacuum pressure and is suitable for cleaning floors, extracting from booth corners, collecting deposited dry overspray, connecting to sanding tools and removing accumulations from machinery through relatively narrow hoses.
- Dust collector: The dust collector prioritises airflow and is suitable for sanding benches, hoods, hoppers, transfer stations, dosing units and points where suspended particulate is generated. The capture inlet must be positioned close to the source.
- Booth ventilation: The paint booth must contain and convey spray, vapours and residues towards an extraction system designed for the process. The mobile vacuum cleaner used for cleaning does not replace booth ventilation and must never be used to directly extract liquid-paint vapours or mists.
Why a generic vacuum cleaner may not be sufficient
A machine that is not correctly configured may initially collect dust but quickly lose efficiency. Motor power alone is not sufficient to establish whether the vacuum cleaner is suitable.
The most frequent technical and operational problems:
- Immediate filter clogging with very fine dust and pigments;
- Sharp reduction in airflow during sanding of fillers;
- Permanent adhesion of resinous pigments to standard filter cartridges;
- Dust dispersion and cross-contamination between different colours;
- Build-up of electrostatic charges without suitable earthing;
- Inconvenient rigid-drum collection that slows procedures during colour changes;
- Attempts to collect liquid paints with machines designed exclusively for dry material;
- Use of non-certified machines in classified areas with gas or dust explosion risk.
How to choose the ideal vacuum cleaner: FEVI parameters
Correct sizing is based on mapping the contaminant state, the frequency of operating cycles and the finishing requirements:
1. Identify the contaminant state and safety data sheet
The machine for fine dust must be used only for compatible dry materials, such as dry overspray or primer residues. Uncured liquid paint, sludge, solvents and thinners must not be introduced into a common vacuum cleaner. The safety data sheet must be checked for composition, particle size, combustibility, toxicity and sensitising components, such as isocyanates in two-component paints, which require extracted booths and suitable filtration stages.
2. Colour-change management and powder recovery
In departments with frequent colour changes, even minimal traces of the previous pigment can cause colour variations or aesthetic defects on the product. To reduce the risk, dedicated vacuum cleaners, identified hoses and Longopac continuous-bag technology are used. Remember that replacing the bag alone does not remove colour left inside the hose or filter. In addition, overspray recovered from the floor or contaminated corners must not be reintroduced into the booth cycle.
3. Airflow engineering: airflow vs vacuum pressure
High vacuum pressure is required for manual floor cleaning, booth corners or direct connection to sanding-pad tools. High airflow becomes the priority when a floating cloud must be intercepted or particulate must be contained around a dosing unit or open sanding benches through hoods and dust collectors.
4. Choice of filter media, PTFE membranes and absolute HEPA stages
Coating powders and primers tend to adhere to filters. The use of large surfaces with smooth PTFE membranes limits deep dust penetration and supports effective detachment during regeneration. If the risk assessment requires a strict containment level, or if filtered air is returned to the department, a final absolute HEPA stage provides an additional barrier, provided it is protected by an efficient primary filter.
Comparison table for painting and coating systems
| Application requirement | Recommended solution | Why it matters |
|---|---|---|
| Localised sanding | Single-phase vacuum cleaner for fine dust | Intercepts dust directly from the tool |
| Frequent colour changes | Longopac and dedicated accessories | Limits transfer operations and contamination |
| Cleaning a powder booth | High-vacuum industrial vacuum cleaner | Collects dry overspray from floors and corners |
| Continuous sanding | Three-phase industrial vacuum cleaner with automatic cleaning | Offers greater continuity during the shift |
| Airborne dust on a bench | High-airflow dust collector | Intercepts particulate before dispersion |
| Very fine pigments | Large filter surface area and PTFE | Reduces penetration and rapid clogging |
| Combustible dust in Zone 22 | Verified ATEX vacuum cleaner | Adapts the machine to the actual classification |
| Capture in a classified area | Compatible ATEX dust collector | Manages airborne dust using a hood |
| Several booths or distant points | Centralised system | Sizes airflow, vacuum pressure and simultaneous use |
Analysis of operating phases and department maintenance
Within painting and coating lines, removing accumulations helps prevent aesthetic defects and reduce industrial risks:
- Sanding fillers and primers: Generates microscopic volatile particulate. Permanently connecting the manual tool to a system with automatic filter cleaning, such as ICLEAN or PULSE technology, helps prevent loss of efficiency during sanding.
- Cleaning booths, guns, cyclones and hoppers: Dry overspray accumulates on edges and blind corners. Maintenance operations must be carried out with the system stopped. ATEX compatibility must be analysed carefully because the inside of cyclones often has stricter classifications than the outside.
- Powder transfer and loading: Opening Big Bags and filling hoppers produces clouds close to the operator. Optimal containment is achieved using hoods connected to dust collectors, leaving the mobile vacuum cleaner to remove deposits from the floor.
- Maintenance of liquid-paint booths: The vacuum cleaner is used exclusively for completely dry solidified residues before application or with the system stopped. Fresh paints, soaked filters and floating aerosols remain the responsibility of the booth ventilation system.
First recommended FEVI model: FEVI PULSE 11XA
For localised sanding, small departments, body shops, rapid colour-change management and modest quantities of dry overspray in non-ATEX classified areas, FEVI PULSE 11XA is the first excellent technical reference model to assess.
This 230 V single-phase vacuum cleaner features a 1,100 W by-pass motor with 250 mbar vacuum pressure. The configuration includes a 10,000 cm² HEPA + PTFE primary cartridge and a secondary absolute H14 filter as standard. The automatic reverse-flow system regenerates the filter media during work sessions, while the Longopac system collects pigments in a tubular bag that can be portioned and sealed, reducing direct container opening and limiting cross-contamination risks.
Technical evolutions for higher requirements
The PULSE model perfectly meets localised mobile requirements, but the intensity of industrial lines requires dedicated configurations:
- Greater airflow with rigid drum or larger Longopac: For frequent sanding at 230 V, the FEVI 220 ICLEAN with 20-litre drum and alternate cartridge shaking can be assessed, or the FEVI 221 PULSE if controlled Longopac collection is required for higher filler volumes. For large booths and intensive single-phase use, the FEVI 350 ICLEAN offers three motors and a 50-litre drum.
- Continuous industrial cycles and fixed networks: For frequent cleaning of powder lines over several shifts, the stability of the 3 kW blower on the FEVI TDC30 ICLEAN is adopted. If the points are distant or heavy pressure losses are mapped, the solution moves to the 5.5 kW FEVI HDC 355 ICLEAN. When several operators work simultaneously, we design a fixed centralised system, sizing diameters and minimum transport speeds.
- Floating clouds from transfer operations and sanding benches: To capture lightweight suspended particulate, the solution moves to industrial dust collectors. For a single localised source, the FEVI DTX 1500 BASIC, 1,500 m³/h, is ideal. For open benches and continuous hoppers, the FEVI DTX 2500 AIRCLEAN is installed, equipped with a 4 kW fan, 80,000 cm² Class M filter surface area and sequential compressed-air pneumatic cleaning.
- ATEX risk assessment, gas and dust: If the safety data sheet identifies combustible dust, or if the area can release solvent and thinner vapours into the air during washing operations, certified machines are required. For localised cleaning in dust Zone 22, the compact response is the FEVI BSL 120 BASIC ATEX 22 with brushless motor and stainless-steel drum. For high airflow on hoppers in Zone 2 or 22, the FEVI DTX 2500 AIRCLEAN ATEX 2-22 dust collector is installed, while for restrictive areas without electrical lines, the pneumatic Venturi FEVI S PN ATEX range can be assessed.
FAQ on extraction in painting and coating systems
Which type of vacuum cleaner is required for a powder coating system?
To remove deposits from floors and structures, an industrial vacuum cleaner for fine dust with PTFE membranes and suitable filter surface areas is required. For laboratories or small batches, a single-phase model may be sufficient, while intensive shifts require three-phase models. If the powder is suspended in the air during transfer operations, a high-airflow industrial dust collector connected to hoods is used.
Can an industrial vacuum cleaner collect liquid paint or solvents?
No. Industrial vacuum cleaners for dust are intended only for dry residues. They must never collect liquid paints, thinners, solvents, spray mists or aerosols. These flammable or toxic volatile contaminants must be managed by the booth ventilation and extraction systems to reduce ignition or intoxication risks.
Does the Longopac system prevent cross-contamination between different colours?
The Longopac continuous-bag system significantly reduces volatile dispersion and allows the collected powder to be bagged and sealed separately, but it does not eliminate cross-contamination by itself. Traces of the previous pigment can remain deposited in the flexible hose, accessories, inlet or primary filter. For sensitive colour changes, hoses and brushes should be dedicated or validated cleaning procedures for the filter chamber should be followed.
When is an ATEX-certified vacuum cleaner required in the painting department?
An ATEX configuration is required if the risk assessment identifies a classified area due to the presence of combustible dust, Zone 21 or 22, or flammable solvent vapours or gases, Zone 1 or 2. Remember that an antistatic filter mounted on a standard machine does not make it ATEX-compliant, and that a vacuum cleaner certified only for dust is not suitable for working in the presence of solvent vapours.
Tell us the characteristics of your painting or coating system
Extremely fine dust from sanding primers and fillers requires technological responses very different from dry overspray colour-change management or capture at source on hoppers. To identify the correct configuration, tell us the type of coating used, powder or liquid, the chemical composition of the product, the estimated quantity of overspray, colour-change frequency, piping layout and ATEX classification of your environment.
We will assess airflow, vacuum pressure, filter membranes and discharge logic together to configure the FEVI combination of solutions most suitable for keeping your production department cleaner, more efficient and safer.
