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Which extraction unit should I choose?

Which extraction system is most suitable for your situation depends on a number of factors, such as the capacity required, the number of machines to be connected and the frequency of use. For more information, see the dedicated page on our website.


How can residual waste be processed?

Riedex extractors offer different ways of handling waste. The most common is the B-version. The B-version is equipped with one or more waste bins into which a plastic bag is placed. The plastic bag fills with waste and the level can be checked through a viewing window. Is the bag full? Then it can be tied up and disposed of with the residual waste. When disposing of the bags, remember to use an FFP2 mouth mask.

Another version is the so-called P version. This version is chosen when an extraction unit is placed on top of a briquetting press. The residual waste from the processing machines is processed directly into the press, compressing the waste with a ratio of about 8 to 1. This significantly reduces the disposal costs of the residual material or the residual waste can be used to feed a burner, for example.

The RV version that Riedex has in its range is the version with the rotary lock. The rotary lock is used for pressure-free dumping of material in, for example, container or silo. The extraction system is raised and a roller container, for example, can be placed under the rotary sluice. An RV version can also be constructed at ground level, with the bottom of the rotary sluice flush with the floor. In this way, the material can be further processed via a storey floor. Rotary sluice is also increasingly used when filling a briquette press, the advantage of which is that the briquette press is not sucked under pressure and the internal "dirty" air volume is also not too large so that the combustible volume is also reduced.

Finally, Riedex supplies the C version which is used to fill 20-foot containers, for example. The C version consists of an RV version combined with, among other things, a transport fan with piping to fill an open or closed container. This version is mainly used for companies that process too much and/or too fast residual waste and where the other versions cannot keep up. The C-version can also be used, for instance, to circulate a material flow over a briquetting press by means of a cyclone with ring piping. The possibilities are endless.

What are indoor extraction units?

Indoor installations are filters with a maximum capacity of 8000 m3/h and which are manufactured according to standard EN-16770. This is the applicable standard for indoor wood dust extraction, but the standard extends this to all suctioned or processed materials falling into Explosion Class St1. The minimum ignition energy of the material must not be lower than 10 mJ and/or have a lower explosive limit (LEL) than 30 grams per cubic metre of air.

The filters are characterised by a small internal "dirty" air volume. This is the amount of contaminated air that is inside the extractor before it is separated by the filters and could potentially cause danger through fire or a possible dust explosion.

Due to the small size of the filter and other mandatory items such as filter monitoring, pressure-resistant housing and minimum performance requirements regarding vacuum and volume, these filter units meet high safety requirements so that they are considered safe for use inside a workplace. After all, the risk of injury from fire or explosion is higher on the inside of a building than on the outside, as people are more likely to move past the filter.

Can an indoor setup be outside?

Certainly an indoor set-up can stand outside, but with a few minor adjustments. We do recommend using a canopy, but it is not necessary. The unit is adapted to minimise possible weather influences and the discharge opening is also moved from the top to the side of the filter unit. It is possible to make use of an air return duct, to circulate the warm air from the workshop back inside as well.

What is the difference between an open and a closed container?

In the Netherlands, we are mostly used to working with open containers. The designation "open" container indicates the use of a filter cloth with a cover to vent the container. This type of container can be filled with a transport fan. Besides the "open" containers common to us, "closed" containers are often used in the countries around us. These containers are made entirely of steel and not adapted with an openwork roof. With these containers, it is important to use a ring duct, which results in the transport fan circulating dusty air and therefore needs to be dust-tight. Other container couplings are also necessary. And whereas an open container can use a pressure gauge as a full indicator, a ring line requires a level switch.


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