Filtering Steps

Clean air in four 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.

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.

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