Filtering Steps

Principally, a protective ventilation system works like a gas mask. It sucks in contaminated air and presses it through several filters.

The result is cleaned air that can be breathed in without problems because it is free from any dangerous pollutants. For this purpose, SEKA protective ventilation systems use an operating principle consisting of four steps. It has demonstrated its effectiveness in thousands of applications and was developed to perfection over many years.

1st step:
Inlet grid

The first step serves to filter out any contamination consisting of large particles. For this purpose we use a corrosion-resistant grille which is mounted at the outside of the protective ventilation system. This grille is designed in a way that dirt will not be able stick to it. Instead, any dirt particles will simply fall off due to natural gravitation.

This means, this large particle filter does not need to be maintained regularly. It also does not need to be replaced at any time.

2nd step:
Multy cyclone

Swirls against gross dust: The second step of air treatment is about removing gross airborne dust particles. For this purpose, SEKA uses a maintenance-free cyclone filter which works without any paper filter. It causes the contaminated air to rotate, utilizing the resulting centrifugal forces to remove the larger part of bigger dust particles.

These particles do not need to be held back by the HEPA filter, which considerable increases the filter life of the HEPA filter.

3rd step:
Hepa filter

Effective measures against fine dust particles: The HEPA filter holds back all dust particles smaller than 10 µm (PM10) as well as ultra small particles. According to the DGUV 201-004 standard (formerly BGI581) it needs to conform at least to filter class H13 according to EN 1822 classification.

SEKA, however, insists to stay on the safe side. In order to maintain maximum protection we exclusively use filters according to HEPA H14 or ULPA U15 classification. In this way, we achieve a total filter effect of at least 99.9993%, which conforms to class H dust filters according to EN60335. Such filters are typically required for the safe removal of asbestos dust.

Filters on the basis of cellulose fibres might turn into a breeding ground for microorganism. For this purpose we exclusively use filters on the basis of glass fibres.

4th step:
Activated carbon filter

Effectively removing gases and odors: After the air is virtually free from any dust particles, an activated carbon filter takes care of foul odors, toxic gases and fumes that might represent health hazards.

Activated carbon is usually made of carbon with a highly porous surface. This porous structure results in an extremely large inner surface. Gas molecules attach to the surface of the activated carbon either by sticking to it (adsorption) or as a result of chemical reactions (chemisorption).

A saturated filter surface looses its ability to pick up any further pollutants and needs to be exchanged.

Quality:
Filter effect without compromises

The quality of an activated carbon filter depends on its mass The more activated carbon it contains the more pollutants it is able to absorb and the higher will be its filter life. Especially in the case of surge-like loading a large mass of activated carbon provides added security. With a capacity of 9 kg SEKA offers by far the biggest activated carbon filter on the market.

Dependant on the pollutants that need to be removed from the air activated carbon filters are offered in the different categories: A, B, E, K, AX or hg.

Filter life:
The bigger the better

The maximum filter life not only depends on the surface or the mass of a filter. One vital factor is also the air volume passing through it. For this reason the technology used for SEKA protective ventilation systems is based on relatively large filters in combination with a relatively low air throughput. This results in superior conditions for long filter life and low operating costs.

Filtering Steps

1st step: Inlet grid

2nd step: Multy cyclone

3rd step: Hepa filter

4th step: Activated carbon filter

Quality: Filter effect without compromises