Food dust control is a fundamental requirement in food production facilities, although dust generated during processing is often associated only with housekeeping or workplace comfort. Fine particles generated during the processing of dry products such as flour, sugar, coffee, cocoa, spices, seeds, grains and nuts should be considered collectively in terms of worker health, product hygiene, equipment safety and, under certain conditions, fire and dust explosion risks. For this reason, effective food dust management should be considered an integral part of production safety and worker health.
Food dust released into the air during processes such as grinding, crushing, sieving, product transfer, silo filling, unloading and packaging does not only spread throughout the working environment; it can also accumulate on machine surfaces, electrical equipment, structural elements and hard-to-reach areas.
Therefore, an effective food dust collection system is not simply a high-airflow fan or a large filtration unit. Dust characteristics, source capture methods, process conditions, hygiene requirements and, where applicable, ATEX requirements should all be considered together when selecting the system.
Which types of dust can pose a hazard in food production?
The fact that a food raw material is not easily ignited in its normal form does not mean that it will behave the same way when reduced to fine dust. When fine combustible particles reach a suitable concentration in the air and a sufficient ignition source is present, they can create a fire or explosion risk.
The UK Health and Safety Executive (HSE) identifies flour, instant coffee, sugar, milk powder and similar food dusts as examples of potentially explosive dusts. HSE also states that processes such as milling, sugar grinding/pulverising, instant coffee and milk powder production, as well as grain handling and storage, can generate potentially explosive dust.(1)
OSHA’s combustible dust resources also list flour, starch, sugar, cocoa, spices, grains and various food products among materials capable of generating combustible dust.(2)
Therefore, the characteristics of dust generated particularly in processes such as;
- coffee roasting, grinding and packaging,
- seed processing and packaging,
- nut crushing, sieving and roasting,
- flour and grain processing,
- production processes involving sugar and starch,
- cocoa and chocolate production,
- spice grinding and packaging
should be evaluated separately.
The important point here is to understand that not every type of food dust has the same explosion characteristics. Particle size, moisture content, product composition and process conditions can affect the level of risk.
At which points in food production is dust generated?
Effective food dust control requires identifying all points where dust is generated throughout the production process. In food processing facilities, dust usually originates not from a single machine but from multiple points as the product moves throughout the facility. Feeding, grinding, elevators, silos, transfer and packaging points should therefore be evaluated individually.
1- Feeding and discharge points
When coffee, seeds, nuts, grains or similar dry products are poured into a hopper, a dense dust cloud can form within a short period of time.
At such points, using only an extraction duct may not be sufficient. Local extraction hoods that provide the highest possible degree of enclosure without interfering with product feeding or operator access may be more effective.
The objective is to capture dust as close as possible to the point where it is generated, rather than collecting it after it has dispersed throughout the production area.
2- Grinding, crushing and sieving
Coffee grinders, spice mills, grain mills, seed and nut processing machines are processes where the generation of fine particles can be particularly intensive.
Machine inlets, outlets, body connections and product drop points can each be considered as separate extraction points.
3- Elevator, transfer and silo systems
At transfer points where the product changes direction or level, at bucket elevator inlets and outlets, or during silo filling, fine dust can be carried along with the movement of the product.
At these points, the combined use of enclosed transfer geometries and a central dust collection system can significantly limit the release of dust into the production area.
4- Packaging and bagging
During free product discharge and bag changes, operators may be directly exposed to dust clouds. Local extraction systems at packaging points should be designed to reduce dust in the working area without unnecessarily extracting the product itself into the collection system.
Why is ATEX assessment important for food dust?
If the dust involved may have combustible or explosive properties, a standard industrial dust collection system or standard vacuum cleaner should not be selected without further assessment.
The European Union’s 2014/34/EU ATEX Directive covers equipment and protective systems intended for use in potentially explosive atmospheres. The Directive also covers explosive atmospheres that may be formed by combustible dust mixed with air.(3)
In Türkiye, the Regulation on Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres (2014/34/EU) was published in the Official Gazette No. 29758 dated 30 June 2016.(4)
In addition, assessing the risk of explosive atmospheres in workplaces, classifying hazardous areas and preparing an Explosion Protection Document constitute separate occupational safety obligations. The relevant regulation in Türkiye covers workplaces where explosive atmospheres may occur and establishes requirements concerning Zone classification and the Explosion Protection Document.(5)
Therefore, in a facility handling coffee dust, seed dust, nut dust, flour, sugar or similar organic dusts, equipment selection should be based on risk assessment and the relevant Zone classification of the facility.
Does using an antistatic filter make equipment ATEX compliant?
No.
Using an antistatic filter, stainless steel body or HEPA filter alone does not make a device an ATEX-certified system.
Depending on the application;
- motor and electrical components,
- fan or vacuum generator,
- filtration system,
- dust collection container,
- sensors,
- hoses and connections,
- grounding and electrical continuity,
- explosion venting or isolation systems
should be evaluated as an integrated system.
Technical specifications are also expected to address grounding, antistatic continuity, explosion venting/isolation, suitable electrical equipment and the food compatibility of product-contact surfaces as a whole.
Why are stainless steel and antistatic equipment preferred?
Stainless steel industrial vacuum cleaners used in food production offer significant advantages, particularly due to their cleanability, corrosion resistance and durable surfaces suitable for process environments.
In facilities processing dry products such as coffee, seeds, nuts, flour and spices, dust can accumulate not only inside the filter but also in hoses, connections, collection containers and suction accessories.
Therefore, depending on the application;
- stainless steel bodies and accessories,
- easy-to-clean surfaces,
- antistatic hoses,
- connections ensuring electrical continuity,
- appropriate filter classes
should be preferred.
HSE also states that electrostatic charges should be taken into consideration when combustible food dust is cleaned using vacuum equipment and that ATEX-certified vacuum cleaners should be used in areas classified as hazardous.(1)
What is the function of a HEPA H14 filter?
High-efficiency filters such as HEPA H14 can be used to limit the return of very fine particles to the working environment with the filtered air.
For example, in industrial vacuum solutions such as W1 EX1/2D, W2 EX1/2D and W3 INFINI 2.5 kW EX1/2D, antistatic filter systems and HEPA H14 filtration options can provide significant advantages for collecting fine food dust.
Explore our Industrial High Vacuum Cleaner products!
https://www.freshweld.com.tr/en/high-vacuum-cleaners/
However, two concepts should be distinguished here:
HEPA filtration relates to particle retention performance, whereas ATEX relates to the suitability of equipment for safe use in potentially explosive atmospheres.
Therefore, high filtration performance and ATEX requirements are complementary characteristics, but they do not replace one another.
Combined use of central dust collection systems and ATEX industrial vacuum cleaners
These two types of equipment serve different purposes.
A central dust collection system is designed to capture dust as close as possible to its source at points such as feeding, grinding, sieving, transfer, silos or packaging while production is in progress.
An ATEX industrial vacuum cleaner, on the other hand, is used for the controlled removal of dust accumulated on process equipment, around machinery, on floors and at maintenance access points.
This cleaning is important not only for maintaining an orderly working environment. Regular removal of dust accumulation from machine bodies, areas around motors, moving components, ventilation openings and maintenance access points can contribute to more controlled maintenance operations, reduce unnecessary maintenance downtime and help preserve equipment service life.
Therefore, central filtration and ATEX industrial vacuum cleaners are not alternatives to one another; in many facilities, they are two separate and complementary dust control methods.
| Application | Recommended approach |
|---|---|
| Continuous dust during grinding/crushing | Central dust collection |
| Sudden dust cloud during feeding or discharge | Local hood + central extraction |
| Elevator and transfer points | Local process extraction |
| Silo filling/unloading | Process/silo extraction system |
| Dust accumulated on machinery or floors | ATEX industrial vacuum |
| Area classified as a potentially explosive atmosphere | ATEX equipment of the appropriate category |
Within the FRESHWELD product range, cartridge-filter central dust collection systems provide solutions for centrally managing multiple extraction points throughout the process, while industrial vacuum solutions such as W1 EX1/2D, W2 EX1/2D and W3 INFINI EX1/2D can be considered complementary solutions for local cleaning and maintenance operations.
How should a food dust collection system be designed?
When selecting a system for the food industry, considering only the fan motor power or the maximum airflow stated in the catalogue is not sufficient.
In actual industrial projects, total airflow, filter area and fan operating point should be calculated based on the characteristics of the extraction points and the processes operating simultaneously. Technical specifications are also expected to take into account the required airflow at each extraction point, duct pressure losses, fan operating point, filter area and safety equipment.
Therefore, the main selection criteria are:
- physical and explosibility characteristics of the dust,
- ATEX/Zone assessment of the facility,
- process points where dust is generated,
- required capture airflow and extraction geometry,
- duct air velocities and pressure losses,
- filter type and filter surface area,
- fan operating point,
- grounding and antistatic continuity,
- material and cleanability of parts in contact with the product.
Particularly in coffee dust, seed dust and nut dust collection systems, excessive extraction airflow may draw the product itself into the system, while insufficient extraction may allow fine dust to escape into the production area.
Therefore, the right system is not the one that provides the highest airflow, but the one that effectively captures dust at the point where it is generated without disrupting the process and filters it safely.
Conclusion
Food dust control should not be considered solely as a housekeeping measure. Fine dust generated during the processing of many dry products such as coffee, seeds, nuts, flour, sugar, grains, cocoa and spices can present risks related to worker exposure, product hygiene, equipment cleanliness and, under suitable conditions, fire or explosion.
Therefore, a food dust collection system should be designed after evaluating the characteristics of the process and considering local extraction, central filtration, ATEX compliance, antistatic equipment and, where necessary, stainless steel industrial vacuum solutions together.
FRESHWELD provides technical support in identifying systems for different process requirements, from determining dust sources along the production line to central dust collection and filtration systems, ATEX applications and industrial vacuum solutions.
Contact the FRESHWELD technical team to determine the appropriate extraction and filtration solution for dust generated in your coffee, seed, nut or other dry food processes.
Contact Our Technical Team and Let's Choose the Right Product TogetherReferences
- Health and Safety Executive (HSE) – Preventing dust explosions in the food industry.
https://www.hse.gov.uk/food/safety-hazards/dustexplosion.htm - Occupational Safety and Health Administration (OSHA) – Combustible Dust.
https://www.osha.gov/combustible-dust - European Parliament and Council – Directive 2014/34/EU (ATEX).
https://eur-lex.europa.eu/legal-content/en/TXT/?uri=CELEX:32014L0034 - Republic of Türkiye Official Gazette – Regulation on Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres (2014/34/EU), 30 June 2016, No. 29758.
https://www.resmigazete.gov.tr/eskiler/2016/06/20160630-13.htm - Regulation on the Protection of Employees from the Hazards of Explosive Atmospheres, 30 April 2013, No. 28633.
Regulation text
Our content emphasizing worker and environmental health is for informational purposes only and is based on research available at the time of publication. For any questions, concerns, diagnoses, or treatment needs related to your health, please consult a physician or a qualified healthcare provider.
- Antistatic Filter, ATEX, ATEX Industrial Vacuum, Central Dust Collection, Coffee Dust, Combustible Dust, Dust Control, Equipment Maintenance, Explosion-Proof Vacuum, Flour Dust, Food Industry, HEPA H14, Industrial Dust Collection, Industrial Vacuum, Nut Dust, Production Safety, Seed Dust, Stainless Steel Vacuum, Sugar Dust, worker health
