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 16890-3:2016)

ISO 16890-3:2016 specifies the test equipment and the test methods used for measuring the gravimetric efficiency and resistance to air flow of air filter for general ventilation.
It is intended for use in conjunction with ISO 16890‑1, ISO 16890‑2 and ISO 16890‑4.
The test method described in this part of ISO 16890 is applicable for air flow rates between 0,25 m3/s (900 m3/h, 530 ft3/min) and 1,5 m3/s (5 400 m3/h, 3 178 ft3/min), referring to a test rig with a nominal face area of 610 mm × 610 mm (24 in × 24 in).
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 as per the procedures defined within ISO 16890 (all parts).
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.

Luftfilter für die allgemeine Raumlufttechnik - Teil 3: Ermittlung des gravimetrischen Wirkungsgrades sowie des durchflusswiderstandes im Vergleich zu der aufgenommenen Masse von Prüfstaub (ISO 16890-3:2016)

Filtres à air de ventilation générale - Partie 3: Détermination de l'efficacité gravimétrique et de la résistance à l'écoulement de l'air par rapport à la quantité de poussière d'essai retenue (ISO 16890-3:2016)

ISO 16890-3:2016 spécifie l'équipement d'essai et les méthodes d'essai utilisés pour mesurer l'efficacité gravimétrique et la résistance à l'écoulement de l'air d'un filtre à air de ventilation générale.
Elle est destinée à être utilisée conjointement avec l'ISO 16890‑1, ISO 16890‑2 et ISO 16890‑4.
La méthode d'essai décrite dans la présente partie de l'ISO 16890 est applicable pour des débits d'air compris entre 0,25 m3/s (900 m3/h, 530 ft3/min) et 1,5 m3/s (5 400 m3/h, 3 178 ft3/min), en se référant 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 filtrants 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).
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.

Zračni filtri pri splošnem prezračevanju - 3. del: Ugotavljanje gravimetrijske učinkovitosti in odpornosti pretoka zraka v odvisnosti od mase zajetega preskusnega prahu (ISO 16890-3:2016)

Ta evropski standard se uporablja za zračne filtre delcev za splošno prezračevanje, katerih začetna učinkovitost je manj kot 99 % glede na vrednosti PM1, ki so določene v standardu ISO 16890-1 Zračni filtri pri splošnem prezračevanju - 1. del: Tehnične specifikacije, zahteve in sistem razvrščanja učinkovitosti na podlagi trdnih delcev (PM). Filtri, ki se uporabljajo pri prezračevanju nizkih stanovanjskih stavb ali premični čistilniki zraka v prostorih so izključeni s področja uporabe tega standarda. Ta mednarodni standard opisuje postopek za določitev gravimetrične učinkovitosti in odpornosti pretoka zraka za dano napravo za čiščenje. V vložek filtra se po ugotovitvi začetne učinkovitosti odstranjevanja delcev in kondicionirane učinkovitosti odstranjevanja delcev nalaga sintetični prah, dokler se ne doseže končni padec tlaka v preskusu. Krivulja padca tlaka v primerjavi z nalaganjem prahu se zabeleži med nalaganjem prahu, s čimer se ugotovi zmogljivost zadrževanja prahu. Rezultatov glede zmogljivosti, pridobljenih v skladu s to serijo standardov, ni mogoče samih po sebi kvantitativno uporabiti za predvidevanje zmogljivosti med obratovanjem, in sicer v zvezi z učinkovitostjo in življenjsko dobo. Drugi dejavniki, ki vplivajo na zmogljivost in jih je treba upoštevati, so opisani v dodatku A (informativnem).

General Information

Status
Published
Publication Date
13-Dec-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
14-Dec-2016
Completion Date
14-Dec-2016

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SLOVENSKI STANDARD
SIST EN ISO 16890-3:2017
01-marec-2017
1DGRPHãþD
SIST EN 779:2012
=UDþQLILOWULSULVSORãQHPSUH]UDþHYDQMXGHO8JRWDYOMDQMHJUDYLPHWULMVNH
XþLQNRYLWRVWLLQRGSRUQRVWLSUHWRND]UDNDYRGYLVQRVWLRGPDVH]DMHWHJD
SUHVNXVQHJDSUDKX ,62

Air filters for general ventilation - Part 3: Determination of the gravimetric efficiency and

the airflow resistance versus the mass of test dust captured (ISO 16890-3:2016)

Luftfilter für die allgemeine Raumlufttechnik - Teil 3: Ermittlung des gravimetrischen

Wirkungsgrades sowie des durchflusswiderstandes im Vergleich zu der aufgenommenen

Masse von Prüfstaub (ISO 16890-3:2016)

Filtres à air pour ventilation générale - Partie 3: Détermination de l'efficacité

gravimétrique et de la résistance à l'écoulement de l'air par rapport à la quantité de

poussière retenue (ISO 16890-3:2016)
Ta slovenski standard je istoveten z: EN ISO 16890-3:2016
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning systems
SIST EN ISO 16890-3:2017 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 16890-3:2017
---------------------- Page: 2 ----------------------
SIST EN ISO 16890-3:2017
EN ISO 16890-3
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2016
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN 779:2012
English Version
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 16890-3:2016)

Filtres à air de ventilation générale - Partie 3: Luftfilter für die allgemeine Raumlufttechnik - Teil 3:

Détermination de l'efficacité gravimétrique et de la Ermittlung des gravimetrischen Wirkungsgrades sowie

résistance à l'écoulement de l'air par rapport à la des durchflusswiderstandes im Vergleich zu der

quantité de poussière d'essai retenue (ISO 16890- aufgenommenen Masse von Prüfstaub (ISO 16890-

3:2016) 3:2016)
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 16890-3:2016 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 16890-3:2017
EN ISO 16890-3:2016 (E)
Contents Page

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

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SIST EN ISO 16890-3:2017
EN ISO 16890-3:2016 (E)
European foreword

This document (EN ISO 16890-3:2016) 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 16890-3:2016 has been approved by CEN as EN ISO 16890-3:2016 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 16890-3:2017
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SIST EN ISO 16890-3:2017
INTERNATIONAL ISO
STANDARD 16890-3
First edition
2016-12-01
Air filters for general ventilation —
Part 3:
Determination of the gravimetric
efficiency and the air flow resistance
versus the mass of test dust captured
Filtres à air de ventilation générale —
Partie 3: Détermination de l’efficacité gravimétrique et de la
résistance à l’écoulement de l’air par rapport à la quantité de
poussière d’essai retenue
Reference number
ISO 16890-3:2016(E)
ISO 2016
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SIST EN ISO 16890-3:2017
ISO 16890-3:2016(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 16890-3:2017
ISO 16890-3:2016(E)
Contents Page

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

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 1

3.1 Air flow and resistance .................................................................................................................................................................... 2

3.2 Test device .................................................................................................................................................................................................. 2

3.3 Gravimetric efficiency ....................................................................................................................................................................... 3

3.4 Other terms ................................................................................................................................................................................................ 4

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

5 General test device requirements ...................................................................................................................................................... 5

5.1 Test device requirements ............................................................................................................................................................... 5

5.2 Test device preparation ................................................................................................................................................................... 5

6 Loading dust .............................................................................................................................................................................................................. 6

7 Test equipment....................................................................................................................................................................................................... 6

8 Qualification of test rig and apparatus .......................................................................................................................................... 9

8.1 Schedule of qualification testing requirements .......................................................................................................... 9

8.2 Dust feeder air flow rate ................................................................................................................................................................. 9

8.3 Final filter efficiency qualification test ..........................................................................................................................10

9 Test sequence dust-loading procedure ......................................................................................................................................10

9.1 Test procedure for the filter ......................................................................................................................................................10

9.1.1 Preparation of the test device ............................................................................................................................10

9.1.2 Initial resistance to air flow .................................................................................................................................10

9.2 Dust loading ............................................................................................................................................................................................10

9.2.1 Dust loading procedure .................. .........................................................................................................................10

9.2.2 Arrestance ..........................................................................................................................................................................11

9.2.3 Test dust capacity .........................................................................................................................................................12

10 Reporting results ..............................................................................................................................................................................................12

10.1 General ........................................................................................................................................................................................................12

10.2 Required reporting elements ..................................................................................................................................................12

10.2.1 Report values ...................................................................................................................................................................12

10.2.2 Report summary ...........................................................................................................................................................12

10.2.3 Report details ..................................................................................................................................................................14

Annex A (informative) Resistance to air flow calculation............................................................................................................19

Bibliography .............................................................................................................................................................................................................................21

© ISO 2016 – All rights reserved iii
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SIST EN ISO 16890-3:2017
ISO 16890-3:2016(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 16890-3, together with ISO 16890-1, ISO 16890-2 and ISO 16890-4, 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 16890-3:2017
ISO 16890-3:2016(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 16890-3:2017
ISO 16890-3:2016(E)

according to the procedures defined in ISO 16890-4 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 this part of ISO 16890.
vi © ISO 2016 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 16890-3:2017
INTERNATIONAL STANDARD ISO 16890-3:2016(E)
Air filters for general ventilation —
Part 3:
Determination of the gravimetric efficiency and the air
flow resistance versus the mass of test dust captured
1 Scope

This part of ISO 16890 specifies the test equipment and the test methods used for measuring the

gravimetric efficiency and resistance to air flow of air filter for general ventilation.

It is intended for use in conjunction with ISO 16890-1, ISO 16890-2 and ISO 16890-4.

The test method described in this part of ISO 16890 is applicable for air flow rates between 0,25 m /s

3 3 3 3 3

(900 m /h, 530 ft /min) and 1,5 m /s (5 400 m /h, 3 178 ft /min), referring to a test rig with a nominal

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

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 as per the

procedures defined within ISO 16890 (all parts).

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.

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 15957, Test dusts for evaluating air cleaning equipment

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

classification system based upon particulate matter efficiency (ePM)

ISO 16890-2:2016, Air filters for general ventilation — Part 2: Measurement of fractional efficiency and

resistance to air flow

ISO 16890-4, Air filters for general ventilation — Part 4: Conditioning method to determine the minimum

fractional test efficiency

ISO 29463-1, High-efficiency filters and filter media for removing particles in air — Part 1: Classification,

performance testing and marking
ISO 29464, Cleaning equipment for air and other gases — Terminology
3 Terms and definitions

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

© ISO 2016 – All rights reserved 1
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SIST EN ISO 16890-3:2017
ISO 16890-3:2016(E)
3.1 Air flow and resistance
3.1.1
air flow rate
volume of air passing through the filter per unit time
3.1.2
nominal air volume flow rate
air flow rate (3.1.1) specified by the manufacturer
3.1.3
filter face velocity
air flow rate (3.1.1) divided by the face area
Note 1 to entry: Filter face velocity is expressed in m/s.
3.1.4
resistance to air flow

difference in pressure between two points in an air flow system at specified conditions, especially

when measured across the filter element (3.2.2)
Note 1 to entry: Resistance to air flow is measured in Pa.
3.1.5
recommended final resistance to air flow

maximum operating resistance to air flow (3.1.4) of the filter as recommended by the manufacturer

Note 1 to entry: Recommended final resistance to air flow is measured in Pa.
3.1.6
final resistance to air flow

resistance to air flow (3.1.4) up to which the filtration performance is measured to determine the

average arrestance (3.3.3) and test dust capacity (3.3.4)
Note 1 to entry: Final differential pressure to air flow is measured in Pa.
3.1.7
initial resistance to air flow

resistance to air flow (3.1.4) of the clean filter operating at its test air flow rate (3.1.1)

Note 1 to entry: Initial resistance to air flow is measured in Pa.
3.1.8
test air
air to be used for testing purposes
3.2 Test device
3.2.1
test device
filter element (3.2.2) to be tested
3.2.2
filter element

structure made of the filtering material, its supports and its interfaces with the filter housing

3.2.3
upstream
U/S

region in a process system traversed by a flowing fluid before it enters that part of the test device (3.2.1)

2 © ISO 2016 – All rights reserved
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SIST EN ISO 16890-3:2017
ISO 16890-3:2016(E)
3.2.4
downstream
D/S
area or region into which fluid flows on leaving the test device (3.2.1)
3.2.5
coarse filter

filtration device with particle removal efficiency <50 % in the PM particle range

3.2.6
fine filter

filtration device with particle removal efficiency ≥50 % in the PM particle range

3.2.7
final filter

air filter used to collect the loading dust (3.3.5) passing through or shedding from the filter under test

3.2.8
effective filter media area

area of the media contained in the filter and effectively passed by air during operation

Note 1 to entry: Effective filter media area is expressed in m .
3.2.9
filter media velocity
air flow rate (3.1.1) divided by the effective filter media area (3.2.8)

Note 1 to entry: Filter media velocity is expressed in m/s to an accuracy of three significant figures.

3.3 Gravimetric efficiency
3.3.1
arrestance

measure of the ability of a filter to remove a standard test dust from the air passing through it, under

given operating conditions
Note 1 to entry: Arrestance is expressed as a weight percentage.
3.3.2
initial arrestance

value of arrestance (3.3.1) determined after the first loading cycle in a filter test

Note 1 to entry: Initial arrestance is expressed as a weight percentage.
3.3.3
average arrestance

ratio of the total amount of loading dust (3.3.5) retained by the filter to the total amount of dust fed up

to final test pressure differential
3.3.4
test dust capacity

amount of loading dust (3.3.5) retained by the filter up to final pressure differential

Note 1 to entry: Test dust capacity is expressed in grams.
3.3.5
loading dust

synthetic dust formulated specifically for determination of the test dust capacity (3.3.4) and arrestance

(3.3.1) of air filters
© ISO 2016 – All rights reserved 3
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SIST EN ISO 16890-3:2017
ISO 16890-3:2016(E)
3.3.6
particle size

geometric diameter (equivalent spherical, optical or aerodynamic, depending on context) of the

particles of an aerosol
3.4 Other terms
3.4.1
HEPA filter

filters with performance complying with requirements of filter class ISO 35H – ISO 45H as per

ISO 29463-1
3.4.2
reference device

primary device possessing accurately known parameters used as a standard for calibrating

secondary devices
3.4.3
filter face area

area of the inside section of the test duct immediately upstream (3.2.3) of the filter under test

Note 1 to entry: Nominal values 0,61 m × 0,61 m = 0,37 m .
4 Symbols and abbreviated terms
A Arrestance, %
A Arrestance in loading phase “j”, %
A Average arrestance during test to final resistance to air flow, %
M Mass of dust fed to the filter during loading phase “j”, g
mean Mean value
m Dust in duct after filter, g
m Mass of dust passing the filter at the dust loading phase “j”, g
m Cumulative mass of dust fed t
...

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