Industrial vacuum cleaner manufacturer - KRAHNEN

Regardless of whether ATEX, clean room, acid or
Containment. Clean with safety!

Are you looking for powerful industrial vacuum cleaners for demanding applications? The owner-managed family company KRAHNEN is a specialist and market leader for cleaning technology in potentially explosive areas. We are manufacturers of industrial vacuum cleaners, which are characterized by special requirements in terms of safety and quality. Our portfolio also includes high-quality industrial floor cleaning machines, compressed air fans and suction nozzles. We have been delivering solutions made in Germany for a wide variety of industries since 1970. From the chemical and pharmaceutical industries to the food, petrochemical and explosive industries. We know the demands of our customers: With us you will find a reliable product for every need for Ex zones 1/2/21/22 and non-Ex areas. Come to us with your challenge - we will be happy to advise you!

With KRAHNEN products you are sure to vacuum!


We have been setting standards for reliable cleaning technology in potentially explosive areas since 1970 - Made in Germany.


We stand for sustainable, responsible management. To protect people, machines and the environment.

Customer satisfaction

We offer you complete, secure solutions from a single source - for complex challenges. Flexible & individual.

Thanks to the modular system for the right industrial vacuum cleaner

As a specialist for industrial vacuum cleaners in potentially explosive areas, we offer you a wide range of compressed air and electrically operated versions. From industrial vacuum cleaners and liquid vacuum cleaners to safety vacuum cleaners, explosive vacuum cleaners and suction solutions for clean rooms. You can buy over 100 different industrial vacuum cleaners from us. Suitable for the desired Ex zone, the material to be vacuumed, the drive required and other specifications. All industrial vacuum cleaners and extraction systems can be flexibly expanded thanks to our modular system.
You can configure your compact vacuum cleaner or the desired explosion-proof extraction system from KRAHNEN according to your requirements, as well as retrofitting and converting it.

Boden Cleaner

Boden Cleaner

Compressed air operated floor cleaning machines for Ex zones 1/2/21/22.

Ex vacuum cleaner

Ex vacuum cleaner

Suitable for ATEX zone 1/2/21/22 and mobile industrial vacuum cleaner certified according to 2014/34 / EU.



Industrial vacuum cleaner for picking up flammable dusts or liquids.

Pharmaceutical / clean room vacuum cleaners

Pharmaceutical / clean room vacuum cleaners

Clean room vacuum cleaner for use in ISO class 5 clean rooms.

Suction nozzles

Suction nozzles

Wing and motorless pressure jet nozzles without moving elements.

Aluminum processing
Automotive industry
Chemical industry
Timber industry
food industry
Pharmaceutical industry
Explosives industry
ATEX vacuum cleaner
Endless pack teat
Average solutions
Solvent vacuum cleaner
Clean room
Acids and alkalis
Explosives suckers

Services from your industrial vacuum cleaner manufacturer KRAHNEN

As an experienced manufacturer of industrial vacuum cleaners for extreme conditions and through long-term partnerships with our customers, we have a high level of expertise. We are your contact, especially when it comes to extraction solutions in ATEX-classified environments.
We will advise you in detail and work with you to plan the technically and economically best cleaning solution for your application.
Our service portfolio for industrial vacuum cleaners and other cleaning products is supplemented by maintenance and repairs. We are also happy to offer you individual training courses such as prototype workshops or product training courses. Would you like to find out more about us as a manufacturer of industrial vacuum cleaners, our products and services? Get in touch - we look forward to your inquiry!

The most important information at a glance
Maintenance and repair

Even after you've bought our products, we won't leave you alone!

Endless pack teat

Discover our new industrial vacuum cleaners with an innovative endless pack cartridge system

about us

If you want to find out more about us, have a look here!


Talks with customers are very important to us! We therefore offer our customers an online demonstration to get to know all of our vacuum cleaners and to get a first impression.

Here you will find answers to frequently asked questions from our customers.

What should you watch out for when sucking in hybrid mixtures in gas Ex areas?

Dry vacuum cleaner in gas hazardous areas

According to the guideline, there is a restriction on the use of vacuum cleaners in the GasEx area. When sucking in gas / dust mixtures, a hybrid mixture is created.

In this case, the following must be observed:

All dusts that are insulating in the electrostatic sense and have the limit value * mentioned below must not be vacuumed up. Non-conductive dusts build up charges during transport (suction / conveyance) with one another or in contact with conductive or non-conductive surfaces. These charges are not diverted immediately when they come into contact with a conductive connection to the earth potential; instead, for example, a very high charge potential can initially develop in a container. The charge created by the collapse of the charged dust is not very high, but this energy can be sufficient to generate ignitable brush discharges towards the earthed container wall. Brush discharges can ignite most flammable gases and vapors, as well as hybrid mixtures. It is therefore forbidden to vacuum non-conductive dust in gas Ex areas without additional safety measures. (For more information, ask for our data sheet "Questions about non-conductive dusts".) "

* The limit value for bulk goods is a specific resistance of ≤ 1 * 10 ^ 8 Ωm (see also TRBS 2153, Section 6.3). For bulk goods with a higher specific resistance, the occurrence of ignitable brush discharges cannot be ruled out.

The KRAHNEN models EGS for the gas Ex area of Zone 1/2 as well as the model EGS GD and DGS for the DustEx (Z21) and the GasEx (Z1) area are designed to accommodate dry, flammable, conductive and non-conductive ** Substances with a minimum ignition energy of> 0.3 mJ have been safety-tested and approved.

(** up to the specified limit value)

Special features when vacuuming in the clean room!

The suction material in the vacuum cleaner is mainly separated using appropriate filters. The vacuum cleaner should have several filters, not for zone separation with flammable substances, but also when picking up normal suction material. Danger of leakage should be avoided not because of the particle size of the pigment, but also with regard to filter breakage. Particular care should be taken when absorbing substances that are hazardous to health. Important points should be asked as a precaution: design, purpose, handling, cleaning and disposal.
In order to avoid the risk of contamination, the appropriate filter element must be available in the vacuum cleaner for the respective application.

What is important is the manufacturer's proof of quality, fineness, class, as well as the tight fit test after installation in the vacuum cleaner.

Filter element Type of construction purpose

Is the filter element resistant to the medium?
Does the filter element fulfill the purpose with regard to the degree of separation?

  • Filter quality
  • Filter class
  • Filter surface loading
  • Filter integrity before commissioning
  • Filter sealing seat before commissioning
  • Proof of compliance with the required OEL values 1 - 5

a) when removing the product and

b) when changing the filter

  • Filterabreinigung
  • How safe after a change?
  • Filter integrity
  • Filter seat
  • Filterabreinigung
Which cleaning methods are resistant to? What must be considered when disposing of the product? Most common mistakes in cleanroom cleaning

During cleaning work, it can happen that the suction hose and accessories are not carefully stored if there is an interruption. Reality shows that there is often no time to think about the fact that some of the dust is deposited inside the accessories and that these are contaminated. When a hand-held suction device falls over, part of the suction material emerges from the openings. In addition, the accessories are often changed during cleaning work. This usually takes place when the suction is interrupted. Hardly any attention is paid to the danger of substances hazardous to health escaping from the accessories. The risk of contamination is inevitable. The highest possible level of purity is required, especially in clean rooms. After the cleaning work has been completed, the room air is often polluted during the clean-up work without closing the suction openings of the accessories.

The use of the right accessories, based on the respective application, is an important step towards greater security. Krahnen tests different types of accessories for its customers with a special hygroscopic neon fine dust (particle size> 0.6 my) under black light. Only a video analysis with the appropriate magnification reveals hidden contamination on the components. Particularly in connection and disconnection processes, dangers arise that remain invisible to the user in daily use.

What should I watch out for if I want to remove small amounts of contamination from, for example, aluminum dust in everyday operations?

Immediately take up spilled aluminum powder in a dry place avoiding the development of dust. A broom with natural hair bristles and conductive, non-sparking shovels with slow sweeping movements should be used. Avoid whirling up in the vicinity of potential ignition sources. The user should be fully equipped with conductive clothing, conductive rubber gloves and appropriate conductive footwear. Do not wash away with water or aqueous cleaners.

Do not use commercially available vacuum cleaners!

The use of explosion-proof vacuum cleaners is possible, provided that they comply with the applicable regulations and guidelines and are suitable for picking up flammable conductive dusts.
Attention, a marking e.g. Ex II 2 D T3 (suitable for use in Zone 21) does not say anything about the properties of the suction device with regard to the desired application.

We recommend industrial vacuum cleaners that have been certified or type-tested in their entirety by the notified body and explicitly permit use with flammable conductive dusts.
Because the design of the vacuum cleaner must be equipped with continuously electrically conductive components (including filter elements) on the raw gas and clean gas sides.
The vacuum cleaner must have appropriate safety devices (e.g. earthing clamp), which the device uses to maintain a fixed connection to the earth potential during use. Suction cups are recommended that do not pose a risk even in the event of a "two-fault case".
In the case of flammable conductive dusts, the manufacturer should always ask you about the type of application and at least about the minimum ignition energy of the suction material. Because in most cases, a case-by-case assessment must be made when the minimum ignition energy of the substance is <5 mJ.

Further information can be obtained from the Federal Institute for Occupational Safety and Health in the technical rules for operational safety, e.g. TRBS 60335-CC, BG RCI Merkblatt 109 or 2014/34 / EU.

Why are flammable conductive dusts a particular hazard?

Flammable conductive dusts contain all of the above-mentioned hazard potentials. Flammable conductive dusts are often of metallic origin. The fineness of the dust is of particular importance. The smaller the grain size of the combustible conductive dust, the greater the possibility of improved oxygen binding, which facilitates the ignition process.
In addition, chemical reactions (base metals) in connection with other media (e.g. aluminum powder and water / see appendix) are of great importance.

It should also be noted that some of the deposited dusts have a lower ignition temperature than when they were whirled up.
In the event of improper handling and under certain circumstances, a combustible, conductive amount of dust can self-ignite when its own (built-up) energy potential is dissipated.

our customers