Air filters for general ventilation - Part 4: Conditioning method to determine the minimum fractional test efficiency (ISO 16890-4:2016)

ISO 16890-4:2016 establishes a conditioning method to determine the minimum fractional test efficiency.
It is intended for use in conjunction with ISO 16890‑1, ISO 16890‑2 and ISO 16890‑3, and provides the related test requirements for the test device and conditioning cabinet as well as the conditioning procedure to follow.
The conditioning method described in this part of ISO 16890 is referring to a test device with a nominal face area of 610 mm × 610 mm (24 inch × 24 inch).
ISO 16890 (all parts) refers to particulate air filter elements for general ventilation having an ePM1 efficiency less than or equal to 99 % and an ePM10 efficiency greater than 20 % when tested according to the procedures defined within ISO 16890 (all parts).
NOTE          The lower limit for this test procedure is set at a minimum ePM10 efficiency of 20 % since it will be very difficult for a test filter element below this level to meet the statistical validity requirements of this procedure.
Air filter elements outside of this aerosol fraction are evaluated by other applicable test methods. See ISO 29463 (all parts).
Filter elements used in portable room-air cleaners are excluded from the scope of this part of ISO 16890.
The performance results obtained in accordance with ISO 16890 (all parts) cannot by themselves be quantitatively applied to predict performance in service with regard to efficiency and lifetime.
The results from this part of ISO 16890 may also be used by other standards that define or classify the fractional efficiency in the size range of 0,3 μm to 10 μm when electrostatic removal mechanism is an important factor to consider, for example ISO 29461.

Luftfilter für die allgemeine Raumlufttechnik - Teil 4: Konditionierungsverfahren für die Ermittlung des Fraktionsabscheidegradminimus (ISO 16890-4:2016)

Filtres à air de ventilation générale - Partie 4: Méthode de conditionnement afin de déterminer l'efficacité spectrale minimum d'essai (ISO 16890-4:2016)

ISO 16890-4:2016 établit une méthode de conditionnement pour déterminer l'efficacité spectrale minimum d'essai.
Elle est destinée à être utilisée conjointement avec l'ISO 16890‑1, l'ISO 16890‑2 et l'ISO 16890‑3 et fournit les exigences d'essai associées pour le dispositif d'essai et l'enceinte de conditionnement ainsi que le mode opératoire de conditionnement à suivre.
La méthode de conditionnement décrite dans la présente partie de l'ISO 16890 se réfère à un banc d'essai ayant une surface frontale nominale de 610 mm × 610 mm (24 inch × 24 inch).
L'ISO 16890 (toutes les parties) concerne les éléments filtrant de ventilation générale ayant une efficacité ePM1 inférieure ou égale à 99 % et une efficacité ePM10 supérieure à 20 %, lorsqu'ils sont soumis à essai selon les modes opératoires définis dans l'ISO 16890 (toutes les parties).
NOTE          Pour ce mode opératoire, la limite inférieure est fixée à une efficacité minimale ePM10 de 20 % étant donné qu'il est très difficile pour un élément filtrant d'essai, en dessous de ce niveau, de respecter les exigences de validité statistique de ce mode opératoire.
En dehors de ces fractions d'aérosol, les éléments filtrants sont évalués par d'autres méthodes d'essai applicables. Voir l'ISO 29463 (toutes les parties).
Les éléments filtrants utilisés dans les épurateurs d'air ambiant portatifs sont exclus du domaine d'application de la présente partie de l'ISO 16890.
Les résultats de performance obtenus conformément à l'ISO 16890 (toutes les parties) ne peuvent pas être utilisés quantitativement pour prédire les performances en service, en ce qui concerne l'efficacité et la durée de vie.
Les résultats de la présente partie de l'ISO 16890 peuvent également être utilisés par d'autres normes qui définissent ou classent l'efficacité spectrale dans la plage granulométrique de 0,3 µm à 10 μm lorsque le mécanisme d'élimination électrostatique est un facteur important à prendre en compte, par exemple l'ISO 29461.

Zračni filtri pri splošnem prezračevanju - 4. del: Metoda kondicioniranja za ugotavljanje minimalne frakcijske učinkovitosti (ISO 16890-4:2016)

Ta evropski standard se uporablja za zračne filtre delcev za splošno prezračevanje, katerih začetna učinkovitost v zvezi z delci velikosti 0,4 μm je manj kot 99 %. Filtri, ki se uporabljajo pri prezračevanju nizkih stanovanjskih stavb ali premični čistilniki zraka v prostorih so izključeni s področja uporabe tega standarda. Opisuje tehnične specifikacije, zahteve in metodo kondicioniranja (izpraznjenja) filtrov v koraku umetnega staranja, s čimer se zagotovijo informacije o intenzivnosti elektrostatičnega mehanizma odstranjevanja. Metoda je uporabna za tok zraka med 0,25 m³/s (900 m³/h, 530 ft³/min) in 1,5 m³/s (5400 m³/h, 3178 ft³/min) v preskusnih ceveh z nazivno površino 0,61 m x 0,61 m. Boljši filtri z začetno učinkovitostjo nad 99 % glede na delce velikosti 0,4 µm se preskušajo in razvrščajo v skladu z drugimi standardi (glej ISO 29463, del 1-5). Filtri v skladu s to serijo standardov se ocenjujejo po njihovi učinkovitosti odstranjevanja delcev aerosolov PM10, PM2.5 in PM1. Učinkovitost zbiranja delcev vložka filtra se meri kot funkcija velikosti delcev v razponu od 0,3 do 10 μm pri praznem in nekondicioniranem vložku filtra. V drugem koraku je treba polni vložek filtra kondicionirati (izprazniti) v koraku umetnega staranja, s čimer se zagotovijo informacije o intenzivnosti elektrostatičnega mehanizma odstranjevanja. Rezultati drugega koraka se uporabljajo za izračun povprečne učinkovitosti v razponih velikosti PM10, PM2.5 in PM1 s ponderiranjem vrednosti frakcijske učinkovitosti glede na porazdelitev standardizirane in normalizirane velikosti delcev povezane frakcije zunanjega aerosola. V tem standardu je določena ta porazdelitev standardizirane in normalizirane velikosti delcev.

General Information

Status
Withdrawn
Publication Date
13-Dec-2016
Withdrawal Date
30-Aug-2022
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
31-Aug-2022

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SLOVENSKI STANDARD
SIST EN ISO 16890-4:2017
01-marec-2017
1DGRPHãþD
SIST EN 779:2012
=UDþQLILOWULSULVSORãQHPSUH]UDþHYDQMXGHO0HWRGDNRQGLFLRQLUDQMD]D
XJRWDYOMDQMHPLQLPDOQHIUDNFLMVNHXþLQNRYLWRVWL ,62

Air filters for general ventilation - Part 4: Conditioning method to determine the minimum

fractional test efficiency (ISO 16890-4:2016)

Luftfilter für die allgemeine Raumlufttechnik - Teil 4: Konditionierungsverfahren für die

Ermittlung des Fraktionsabscheidegradminimus (ISO 16890-4:2016)

Filtres à air pour ventilation générale - Partie 4: Méthode de conditionnement pour

déterminer le rendement fractionnaire minimal d'essai (ISO 16890-4:2016)
Ta slovenski standard je istoveten z: EN ISO 16890-4:2016
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning systems
SIST EN ISO 16890-4:2017 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 16890-4:2017
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SIST EN ISO 16890-4:2017
EN ISO 16890-4
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2016
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN 779:2012
English Version
Air filters for general ventilation - Part 4: Conditioning
method to determine the minimum fractional test
efficiency (ISO 16890-4:2016)

Filtres à air de ventilation générale - Partie 4: Méthode Luftfilter für die allgemeine Raumlufttechnik - Teil 4:

de conditionnement afin de déterminer l'efficacité Konditionierungsverfahren für die Ermittlung des

spectrale minimum d'essai (ISO 16890-4:2016) Fraktionsabscheidegradminimus (ISO 16890-4:2016)

This European Standard was approved by CEN on 19 September 2016.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16890-4:2016 E

worldwide for CEN national Members.
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SIST EN ISO 16890-4:2017
EN ISO 16890-4:2016 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 16890-4:2017
EN ISO 16890-4:2016 (E)
European foreword

This document (EN ISO 16890-4:2016) has been prepared by Technical Committee ISO/TC 142

"Cleaning equipment for air and other gases" in collaboration with Technical Committee CEN/TC 195

“Air filters for general air cleaning” the secretariat of which is held by UNI.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by June 2017, and conflicting national standards shall be

withdrawn at the latest by June 2017.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.
This document supersedes EN 779:2012.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 16890-4:2016 has been approved by CEN as EN ISO 16890-4:2016 without any

modification.
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SIST EN ISO 16890-4:2017
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SIST EN ISO 16890-4:2017
INTERNATIONAL ISO
STANDARD 16890-4
First edition
2016-12-01
Air filters for general ventilation —
Part 4:
Conditioning method to determine the
minimum fractional test efficiency
Filtres à air de ventilation générale —
Partie 4: Méthode de conditionnement afin de déterminer l’efficacité
spectrale minimum d’essai
Reference number
ISO 16890-4:2016(E)
ISO 2016
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SIST EN ISO 16890-4:2017
ISO 16890-4:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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SIST EN ISO 16890-4:2017
ISO 16890-4:2016(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 General conditioning test requirements ..................................................................................................................................... 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Test device requirements ............................................................................................................................................................... 2

5.3 Test device selection .......................................................................................................................................................................... 2

5.4 Conditioning cabinet requirements ...................................................................................................................................... 3

6 Conditioning materials .................................................................................................................................................................................. 3

7 Conditioning cabinet ........................................................................................................................................................................................ 4

7.1 General ........................................................................................................................................................................................................... 4

7.2 Conditioning cabinet dimensions and construction materials ..................................................................... 4

7.3 Environment, temperature and relative humidity ................................................................................................... 5

8 Safety issues .............................................................................................................................................................................................................. 6

9 Test method ............................................................................................................................................................................................................... 6

9.1 General ........................................................................................................................................................................................................... 6

9.2 Conditioning procedure .................................................................................................................................................................. 7

10 Qualification .............................................................................................................................................................................................................. 7

11 Reporting results ................................................................................................................................................................................................. 8

Annex A (informative) Hints for health and safety aspects for the use of IPA ...........................................................9

Bibliography .............................................................................................................................................................................................................................11

© ISO 2016 – All rights reserved iii
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SIST EN ISO 16890-4:2017
ISO 16890-4:2016(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,

as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.

The committee responsible for this document is ISO/TC 142, Cleaning equipment for air and other gases.

This first edition of ISO 16890-4, together with ISO 16890-1, ISO 16890-2 and ISO 16890-3, cancels and

replaces ISO/TS 21220:2009, which has been technically revised.

ISO 16890 consists of the following parts, under the general title Air filters for general ventilation:

— Part 1: Technical specifications, requirements and classification system based upon particulate matter

efficiency (ePM)
— Part 2: Measurement of fractional efficiency and air flow resistance

— Part 3: Determination of the gravimetric efficiency and the air flow resistance versus the mass of test

dust captured

— Part 4: Conditioning method to determine the minimum fractional test efficiency

iv © ISO 2016 – All rights reserved
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SIST EN ISO 16890-4:2017
ISO 16890-4:2016(E)
Introduction

The effects of particulate matter (PM) on human health have been extensively studied in the past

decades. The results are that fine dust can be a serious health hazard, contributing to or even causing

respiratory and cardiovascular diseases. Different classes of particulate matter can be defined according

to the particle size range. The most important ones are PM , PM and PM . The U.S. Environmental

10 2,5 1

Protection Agency (EPA), the World Health Organization (WHO) and the European Union define

PM as particulate matter which passes through a size-selective inlet with a 50 % efficiency cut-off

at 10 µm aerodynamic diameter. PM and PM are similarly defined. However, this definition is not

2,5 1

precise if there is no further characterization of the sampling method and the sampling inlet with a

clearly defined separation curve. In Europe, the reference method for the sampling and measurement

of PM is described in EN 12341. The measurement principle is based on the collection on a filter of the

PM fraction of ambient particulate matter and the gravimetric mass determination (see EU Council

Directive 1999/30/EC of 22 April 1999).

As the precise definition of PM , PM and PM is quite complex and not simple to measure, public

10 2,5 1

authorities, like the U.S. EPA or the German Federal Environmental Agency (Umweltbundesamt),

increasingly use in their publications the more simple denotation of PM as being the particle size

fraction less or equal to 10 µm. Since this deviation to the above mentioned complex “official” definition

does not have a significant impact on a filter element’s particle removal efficiency, the ISO 16890 series

refers to this simplified definition of PM , PM and PM .
10 2,5 1

Particulate matter in the context of the ISO 16890 series describes a size fraction of the natural aerosol

(liquid and solid particles) suspended in ambient air. The symbol ePM describes the efficiency of an air

cleaning device to particles with an optical diameter between 0,3 µm and x µm. The following particle

size ranges are used in the ISO 16890 series for the listed efficiency values.

Table 1 — Optical particle diameter size ranges for the definition of the efficiencies, ePM

Efficiency Size range, µm
ePM 0,3 ≤ × ≤10
ePM 0,3 ≤ × ≤2,5
2,5
ePM 0,3 ≤ × ≤1

Air filters for general ventilation are widely used in heating, ventilation and air-conditioning applications

of buildings. In this application, air filters significantly influence the indoor air quality and, hence, the

health of people, by reducing the concentration of particulate matter. To enable design engineers and

maintenance personnel to choose the correct filter types, there is an interest from international trade

and manufacturing for a well-defined, common method of testing and classifying air filters according

to their particle efficiencies, especially with respect to the removal of particulate matter. Current

regional standards are applying totally different testing and classification methods, which do not allow

any comparison with each other, and thus hinder global trade with common products. Additionally,

the current industry standards have known limitations by generating results which often are far away

from filter performance in service, i.e. overstating the particle removal efficiency of many products.

With this new ISO 16890 series, a completely new approach for a classification system is adopted, which

gives better and more meaningful results compared to the existing standards.

The ISO 16890 series describes the equipment, materials, technical specifications, requirements,

qualifications and procedures to produce the laboratory performance data and efficiency classification

based upon the measured fractional efficiency converted into a particulate matter efficiency (ePM)

reporting system.

Air filter elements according to the ISO 16890 series are evaluated in the laboratory by their ability to

remove aerosol particulate expressed as the efficiency values ePM , ePM and ePM The air filter

1 2,5 10.

elements can then be classified according to the procedures defined in ISO 16890-1. The particulate

removal efficiency of the filter element is measured as a function of the particle size in the range of

0,3 μm to 10 µm of the unloaded and unconditioned filter element as per the procedures defined in

ISO 16890-2. After the initial particulate removal efficiency testing, the air filter element is conditioned

© ISO 2016 – All rights reserved v
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SIST EN ISO 16890-4:2017
ISO 16890-4:2016(E)

according to the procedures defined in this part of ISO 16890 and the particulate removal efficiency is

repeated on the conditioned filter element. This is done to provide information about the intensity of

any electrostatic removal mechanism which may or may not be present with the filter element for test.

The average efficiency of the filter is determined by calculating the mean between the initial efficiency

and the conditioned efficiency for each size range. The average efficiency is used to calculate the ePM

efficiencies by weighting these values to the standardized and normalized particle size distribution of

the related ambient aerosol fraction. When comparing filters tested in accordance with the ISO 16890

series, the fractional efficiency values shall always be compared among the same ePM class (ex. ePM

x 1

of filter A with ePM of filter B). The test dust capacity and the initial arrestance of a filter element are

determined as per the test procedures defined in ISO 16890-3.
vi © ISO 2016 – All rights reserved
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SIST EN ISO 16890-4:2017
INTERNATIONAL STANDARD ISO 16890-4:2016(E)
Air filters for general ventilation —
Part 4:
Conditioning method to determine the minimum fractional
test efficiency
1 Scope

This part of ISO 16890 establishes a conditioning method to determine the minimum fractional test

efficiency.

It is intended for use in conjunction with ISO 16890-1, ISO 16890-2 and ISO 16890-3, and provides

the related test requirements for the test device and conditioning cabinet as well as the conditioning

procedure to follow.

The conditioning method described in this part of ISO 16890 is referring to a test device with a nominal

face area of 610 mm × 610 mm (24 inch × 24 inch).

ISO 16890 (all parts) refers to particulate air filter elements for general ventilation having an ePM

efficiency less than or equal to 99 % and an ePM efficiency greater than 20 % when tested according

to the procedures defined within ISO 16890 (all parts).

NOTE The lower limit for this test procedure is set at a minimum ePM efficiency of 20 % since it will be very

difficult for a test filter element below this level to meet the statistical validity requirements of this procedure.

Air filter elements outside of this aerosol fraction are evaluated by other applicable test methods. See

ISO 29463 (all parts).

Filter elements used in portable room-air cleaners are excluded from the scope of this part of ISO 16890.

The performance results obtained in accordance with ISO 16890 (all parts) cannot by themselves be

quantitatively applied to predict performance in service with regard to efficiency and lifetime.

The results from this part of ISO 16890 may also be used by other standards that define or classify the

fractional efficiency in the size range of 0,3 μm to 10 μm when electrostatic removal mechanism is an

important factor to consider, for example ISO 29461.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 16890-1, Air filters for general ventilation — Part 1: Technical specifications, requirements and

classification system based upon particulate matter efficiency (ePM)

ISO 16890-2, Air filters for general ventilation — Part 2: Measurement of fractional efficiency and air flow

resistance

ISO 16890-3, Air filters for general ventilation — Part 3: Determination of the gravimetric efficiency and

the air flow resistance versus the mass of test dust captured
ISO 29464, Cleaning equipment for air and other gases — Terminology
© ISO 2016 – All rights reserved 1
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SIST EN ISO 16890-4:2017
ISO 16890-4:2016(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 29464 and the following apply.

3.1
minimum fractional test efficiency

fractional efficiency after applying the conditioning method defined in this part of ISO 16890

Note 1 to entry: Also named as “minimum filter efficiency” or “minimum test efficiency”.

Note 2 to entry: Minimum fractional test efficiency shall be measured according to ISO 16890-2.

4 Symbols and abbreviated terms
IPA isopropyl alcohol (isopropanol)
MSDS material safety data sheet
5 General conditioning test requirements
5.1 General

This procedure is used to determine the minimum test efficiency and to test whether the filter fractional

efficiency is dependent on the electrostatic removal mechanism. This is accomplished by measuring the

removal efficiency of an untreated filter and the corresponding efficiency after conditioning.

Many types of air filters rely to different extents on the effects of passive electrostatic charges on the

fibres to achieve higher particle removal efficiencies, particularly in the initial stages of their working

life, at low resistance to airflow.

Exposure to some types of challenge, such as combustion particles, fine particles or oil mist in service

may affect the action of these electric charges so that the initial efficiency may drop substantially after

an initial period of service. This drop in the fractional efficiency can be reduced by a slight increase in

mechanical efficiency from the collection of particles in the filtration media. The amount of the drop

and the amount of the increase can vary by filter type, service location and atmospheric air conditions.

The procedure described here indirectly but quantitatively shows the extent of the electrostatic charge

effect on the initial performance on a full size filter (measured according to ISO 16890-2). It indicates the

level of efficiency obtainable with the charge effect removed (or minimized by IPA vapour conditioning)

and with no increase in mechanical efficiency. It should not be assumed that the measured conditioned

(“discharged”) efficiency always represents real life behaviour. The treatment of a filter as described

in this part of ISO 16890 may affect the structure of the fibre matrix or chemically affect the fibres or

even fully destroy the filter medium. Hence, this procedure may not be applicable to all types of filters.

If degradation shows a visual, physical change or a resistance to airflow change of more than 10 % but

minimum 10 Pa, this part of ISO 16890 is not applicable and the filter cannot be classified according to

ISO 16890-1.
5.2 Test device requirements

The test device shall be designed or marked so as to prevent incorrect mounting. The complete test

device (filter and frame) shall be made of material suitable to withstand normal usage and exposure

to the range of temperature, humidity and corrosive environments likely to be encountered in service.

5.3 Test device selection

The test device shall be mounted in accordance with the manufacturer’s recommendations and,

after equilibration to standard climatic conditions, weighed to the nearest gram. Before starting the

2 © ISO 2016 – All rights reserved
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SIST EN ISO 16890-4:2017
ISO 16890-4:2016(E)

conditioning, the initial resistance to airflow and initial fractional efficiency shall be determined

according to the measurement procedure described in ISO 16890-2.

The test device shall be a full size filter element with a nominal face dimension of 610 mm × 610 mm

(24 inch × 24 inch) with a maximum length (depth) of 760 mm (30 inch). If for any reason dimensions do

not allow conditioning of a test device under standard test conditions, assembly of two or more smaller

devices of the same type or model is permitted, provided no leaks occur in the resulting assembly. For

filters with a higher length or depth, the conditioning cabinet described in 7.1 can be scaled accordingly.

The operating conditions of such accessory equipment shall be recorded.
5.4 Conditioning cabinet requirements

Critical dimensions and arrangements of the conditioning cabinet are shown in the figures of this

part of ISO 16890 and are intended as guides to help construct a conditioning cabinet to meet the

performance requirements of this part of ISO 16890. All dimensions shown are mandatory unless

otherwise indicated. Units shown are in mm (inch) unless otherwise indicated.

The design of equipment not specified (including but not limited to the holding frame, IPA trays,

conditioning cabinet surroundings and auxiliaries) is discretionary, but the equipment shall have

adequate capacity to meet the performance and health and safety requirements described in Clause 8.

6 Conditioning materials

The liquid for the conditioning step to discharge filter media and equalize electrostatic surface charges

on the filter fibres is isopropyl alcohol (IPA, commonly known as isopropanol or 2-propanol). IPA is

placed inside the conditioning cabinet to evaporate until the equilibrium of IPA vapour in ambient air is

reached. So liquid IPA will not be in contact with the filter media.

This part of ISO 16890 does not claim to treat all possible related health and safety issues. It is the

responsibility of the user of this part of ISO 16890 to take suitable measures for the health and safety

protection of the staff before applying this method. Additionally, the responsible user shall take care

that official and legal regulations are fully respected.
HCCH CH
Isopropanol (IPA) – formula: C H O
3 8
Isopropanol properties:
Density 0,785 5 kg/m³
Molecular weight 60,09 g/mol
Melting point 185 K
Boiling point 355 K
Flash point 285 K
Ignition temperature 698 K

Vapour pressure 0,059 7 bar (at 298 K)/0,043 2 bar (at 293 K)/0,081 4 bar (at 303 K)

To be calculated as follows:
log PA=−
TC+
© ISO 2016 – All rights reserved 3
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SIST EN ISO 16890-4:2017
ISO 16890-4:2016(E)
where
P = pressure (bar) T = temperature (K)
A = 4,577 95 B = 1 221,423
C = −87,474
NOTE 1 bar = 100 kPa.

Explosion limits (in air) Lower concentration limit 2 % (vol.), Upper concentration limit 12 % (vol.)

both at 293 K
CAS-number 67-63-0
For the conditioning test, IPA shall have a purity of minimum 99,5 %.
7 Conditioning cabinet
7.1 General

The conditioning cabinet shall consist of a filter holding chamber and one or two IPA tray holding

chambers. Each chamber may have separate doors for service. The filter holding chamber shall allow

the installation of a full size filter (the test device) in a way that the filter does not touch the conditioning

cabinet walls and allows air/vapour to pass around freely by diffusion. There shall be an open air

passage between the IPA tray holding chamber and the filter holding
...

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