EN ISO 10121-3:2022
(Main)Test methods for assessing the performance of gas-phase air cleaning media and devices for general ventilation - Part 3: Classification system for GPACDs applied to treatment of outdoor air (ISO 10121-3:2022)
Test methods for assessing the performance of gas-phase air cleaning media and devices for general ventilation - Part 3: Classification system for GPACDs applied to treatment of outdoor air (ISO 10121-3:2022)
This document establishes a classification system for GPACDs supplying single pass outdoor air to general ventilation systems using outdoor air polluted by local urban sources and/or long-distance pollution. The classification system is intended to aid in assessing molecular contamination in addition to the particulate contamination dealt with by ISO 16890-1.
This document specifies four reference pollutants, i.e. ozone, sulphur dioxide, nitrogen dioxide and toluene, used for the classification due to their relevance to the intended application. This document further specifies three duty levels that are assigned for each pollutant reflecting the typical performance range of devices intended for the application. Since selection of reference pollutants and duty levels are specific and unique to the intended application, all other applications are excluded. In particular, this document does not apply to GPACDs in recirculation applications and/or dealing with pollution from indoor sources as well as pharmaceutical, microelectronic, nuclear, homeland security and military applications.
Methode zur Leistungsermittlung von Medien und Vorrichtungen zur Reinigung der Gasphase für die allgemeine Lüftung - Teil 3: Klassifizierungssystem für GPACDs für die Behandlung von Außenluft (ISO 10121-3:2022)
Dieses Dokument legt ein Klassifizierungssystem für GPACDs fest, die nach einmaliger Durchströmung allgemeine Belüftungssysteme mit Außenluft versorgen und Außenluft verwenden, die durch lokale urbane Quellen und/oder weiträumige Verunreinigungen verschmutzt ist. Zweck des Klassifizierungssystems ist es, die Beurteilung der molekularen Kontamination zusätzlich zu der in ISO 16890 1 behandelten Partikelkontamination zu unterstützen.
In diesem Dokument werden vier Referenzschadstoffe genannt: Ozon, Schwefeldioxid, Stickstoffdioxid und Toluol, die aufgrund ihrer Relevanz für die bestimmungsgemäße Verwendung für die Klassifizierung verwendet werden. In diesem Dokument werden außerdem jedem Schmutzstoff drei Beanspruchungsgrade zugewiesen, die den üblichen Leistungsbereich der für die Anwendung vorgesehenen Vorrichtungen wiedergeben. Da die Auswahl der Referenzschmutzstoffe und der Beanspruchungsgrade spezifisch ist und nur für den bestimmungsgemäßen Gebrauch gilt, sind alle anderen Anwendungen ausgeschlossen. Insbesondere gilt dieses Dokument nicht für GPACD in Rezirkulationsanwendungen und/oder die Verschmutzung aus Innenraumschmutzstoffen sowie pharmazeutische, mikroelektronische, nukleare, Heimatschutz- und militärische Anwendungen.
Méthodes d’essai pour l’évaluation de la performance des médias et des dispositifs de filtration moléculaire pour la ventilation générale - Partie 3: Système de classification pour les GPACD appliqués au traitement de l’air extérieur (ISO 10121-3:2022)
Le présent document établit un système de classification pour les GPACD fournissant de l’air extérieur en passage unique à des systèmes de ventilation générale utilisant de l’air extérieur pollué par des sources urbaines locales et/ou une pollution à longue distance. Le système de classification est destiné à aider pour l’évaluation de la contamination moléculaire en plus de la contamination particulaire traitée par l’ISO 16890-1.
Le présent document spécifie quatre polluants de référence, c’est-à-dire l’ozone, le dioxyde de soufre, le dioxyde d’azote et le toluène, utilisés pour la classification du fait de leur pertinence pour l’application prévue. Le présent document spécifie trois niveaux de service qui sont assignés pour chaque polluant reflétant la plage de performance typique des dispositifs prévus pour l’application. Puisque le choix des polluants de référence et des niveaux de service est spécifique et unique pour l’application prévue, toutes autres applications sont exclues. En particulier, le présent document ne s’applique pas aux GPACD dans les applications de recirculation et/ou le traitement de la pollution provenant de sources intérieures ainsi que les applications pharmaceutiques, microélectroniques, nucléaires, de sécurité intérieure et militaires.
Preskusna metoda za ocenjevanje zmogljivosti sredstev in naprav za čiščenje plinske faze za splošno prezračevanje - 3. del: Sistem klasifikacije za GPACD, ki se uporablja za obdelavo zraka na prostem (ISO 10121-3:2022)
Ta del standarda ISO 10121 vzpostavlja sistem klasifikacije za naprave za čiščenje plinske faze (GPACD), ki dovajajo dodaten zrak v splošne prezračevalne sisteme, ki uporabljajo zunanji zrak, onesnažen z emisijami iz lokalnih mestnih virov in/ali oddaljenih virov onesnaženja. Sistem klasifikacije je predviden kot pomoč pri ocenjevanju molekularnega onesnaženja poleg onesnaženja s trdnimi delci, ki je obravnavano v standardu ISO 16890-1.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2023
Preskusna metoda za ocenjevanje zmogljivosti sredstev in naprav za čiščenje
plinske faze za splošno prezračevanje - 3. del: Sistem klasifikacije za GPACD, ki se
uporablja za obdelavo zraka na prostem (ISO 10121-3:2022)
Test methods for assessing the performance of gas-phase air cleaning media and
devices for general ventilation - Part 3: Classification system for GPACDs applied to
treatment of outdoor air (ISO 10121-3:2022)
Methode zur Leistungsermittlung von Medien und Vorrichtungen zur Reinigung der
Gasphase für die allgemeine Lüftung - Teil 3: Klassifizierungssystem für die Behandlung
von Außenluft (ISO 10121-3:2022)
Méthodes d’essai pour l’évaluation de la performance des médias et des dispositifs de
filtration moléculaire pour la ventilation générale - Partie 3: Système de classification
pour les GPACD appliqués au traitement de l’air extérieur (ISO 10121-3:2022)
Ta slovenski standard je istoveten z: EN ISO 10121-3:2022
ICS:
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 10121-3
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 91.140.30
English Version
Test methods for assessing the performance of gas-phase
air cleaning media and devices for general ventilation -
Part 3: Classification system for GPACDs applied to
treatment of outdoor air (ISO 10121-3:2022)
Méthodes d'essai pour l'évaluation de la performance Methode zur Leistungsermittlung von Medien und
des médias et des dispositifs de filtration moléculaire Vorrichtungen zur Reinigung der Gasphase für die
pour la ventilation générale - Partie 3: Système de allgemeine Lüftung - Teil 3: Klassifizierungssystem für
classification pour les GPACD appliqués au traitement die Behandlung von Außenluft (ISO 10121-3:2022)
de l'air extérieur (ISO 10121-3:2022)
This European Standard was approved by CEN on 25 September 2022.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10121-3:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 10121-3:2022) has been prepared by Technical Committee ISO/TC 142
"Cleaning equipment for air and other gases" in collaboration with Technical Committee CEN/TC 195
“Cleaning equipment for air and other gases” 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 April 2023, and conflicting national standards shall be
withdrawn at the latest by April 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 10121-3:2022 has been approved by CEN as EN ISO 10121-3:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 10121-3
First edition
2022-10
Test methods for assessing the
performance of gas-phase air cleaning
media and devices for general
ventilation —
Part 3:
Classification system for GPACDs
applied to treatment of outdoor air
Méthodes d’essai pour l’évaluation de la performance des médias
et des dispositifs de filtration moléculaire pour la ventilation
générale —
Partie 3: Système de classification pour les GPACD appliqués au
traitement de l’air extérieur
Reference number
ISO 10121-3:2022(E)
ISO 10121-3:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 10121-3:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.6
5 Classification system for outdoor air . 6
5.1 General . 6
5.2 Test setup and test parameters . 7
5.3 Initial removal efficiency . 8
5.4 Dose concept . 8
5.5 Classes, duty levels and dose . 8
5.6 Pollutants and concentrations . 9
5.7 Integrated removal efficiency . 9
5.8 Classification example graph . 10
5.9 Desorption and retentivity . 11
6 Classification test sequence .11
6.1 General . 11
6.2 Conditioning. 11
6.3 Initial removal efficiency .12
6.4 Capacity determination expressed as E (%) versus D (g/m ) .12
c N
6.4.1 Zero to LD . 12
6.4.2 Check E at LD .12
c
6.4.3 LD to MD . 12
6.4.4 MD to HD and HD .12
6.5 Retentivity . 13
6.6 Premature stop . 13
7 Classification system .13
7.1 General .13
7.2 LD, MD and HD dose values . 13
7.3 Classification example . 14
8 Report .15
8.1 General . 15
8.2 Test report layout . 15
Annex A (informative) Information about environment pollutant concentration in outdoor
air .22
Bibliography .24
iii
ISO 10121-3:2022(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 of the voluntary nature of standards, 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
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 142, Cleaning equipment for air and other
gases, in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 195, Cleaning equipment for air and other gases, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 10121 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO 10121-3:2022(E)
Introduction
There is an increasing need for gas-phase filtration in general filtration applications. This demand can
be expected to grow rapidly due to the increasing gaseous pollution problems in the world together with
an increasing awareness that solutions to the problems are available in the form of filtration devices or,
phrased more technically, gas-phase air cleaning devices (GPACD). The performance of devices relies
to a large extent on the performance of the gas-phase air cleaning media (GPACM) incorporated in the
device. The applications and device performance are often poorly understood by the users and suppliers
of such media and devices. Media tests can be adequate to offer data for real applications if actual low
concentrations (< 100 ppb) and longer exposure times (> weeks) can be used in the test, provided that
the geometrical configuration, packing density and flow conditions of the small-scale test specimen
are equal to those used in the real applications. Such tests are however not included in the scope of the
ISO 10121 series.
ISO 10121-1 and ISO 10121-2 aim to provide laboratory test methods for GPACM and GPACD respectively.
From the tests and reports produced, a person skilled in the field of molecular filtration can evaluate
the performance of different products as well as comparing performance using benchmark tests for
specific applications. To make these evaluations, a basic knowledge in chemistry, molecular filtration
and the application at hand are necessary.
Persons not skilled in molecular filtration face challenges with increasing pollution. Annex A shows
the annual average concentration of selected outdoor pollutants, the concentration differences of
different urban and industrial settings as well as an example of ambient air quality guidelines. The
air quality guideline is from WHO, where most countries have similar national threshold values. Due
to this increasing pollution in urban areas, any building owner, facility management engineer, design
engineers or maintenance personnel need to be able to evaluate GPACDs for general ventilation in
buildings. Different standards classifying air filters for particle filtration (e.g. ASHRAE 52.2 and
ISO 16890-1) have, together with many national standards, made a vast difference in facilitating the
selection of air filters for particle filtration for general ventilation in buildings. Equivalent standards
classifying molecular filtration devices, i.e. GPACDs, have not been available up to the publication of this
document. This document addresses the specific case of outdoor air to buildings in cities and aim to be
used in parallel with ISO 16890-1.
The ISO 10121 series consists of three parts.
— ISO 10121-1 covers three different media configurations and aims to provide a standardized interface
between media suppliers and producers of air cleaning devices. It may also be used between media
suppliers and end customers with regards to loose fill media properties.
— ISO 10121-2 aims to provide a standardized interface between suppliers of air cleaning devices and
end customers seeking the most cost-efficient way to employ gas-phase filtration.
— ISO 10121-3 provides a classification system for the specific application of GPACDs in general,
ventilation systems for cleaning of outdoor air polluted by local urban sources and/or long-range
transboundary air pollution.
v
INTERNATIONAL STANDARD ISO 10121-3:2022(E)
Test methods for assessing the performance of gas-phase
air cleaning media and devices for general ventilation —
Part 3:
Classification system for GPACDs applied to treatment of
outdoor air
1 Scope
This document establishes a classification system for GPACDs supplying single pass outdoor air to
general ventilation systems using outdoor air polluted by local urban sources and/or long-distance
pollution. The classification system is intended to aid in assessing molecular contamination in addition
to the particulate contamination dealt with by ISO 16890-1.
This document specifies four reference pollutants, i.e. ozone, sulphur dioxide, nitrogen dioxide and
toluene, used for the classification due to their relevance to the intended application. This document
further specifies three duty levels that are assigned for each pollutant reflecting the typical performance
range of devices intended for the application. Since selection of reference pollutants and duty levels are
specific and unique to the intended application, all other applications are excluded. In particular, this
document does not apply to GPACDs in recirculation applications and/or dealing with pollution from
indoor sources as well as pharmaceutical, microelectronic, nuclear, homeland security and military
applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 10121-2:2013, Test methods for assessing the performance of gas-phase air cleaning media and devices
for general ventilation — Part 2: Gas-phase air cleaning devices (GPACD)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
adsorption
process in which the molecules of a gas (3.14) or vapour adhere by physical or chemical processes to
the exposed surface of solid substances, both the outer surface and inner pore surface, with which they
come into contact
[SOURCE: ISO 29464:2017, 3.5.7]
ISO 10121-3:2022(E)
3.2
adsorbate
molecular compound in gaseous or vapour phase that may be retained by an adsorbent (3.3) medium
[SOURCE: ISO 29464:2017, 3.5.3]
3.3
adsorbent
material having the ability to retain gaseous or vapour contaminants (3.10) on its surface by physical or
chemical processes
[SOURCE: ISO 29464:2017, 3.5.4]
3.4
ambient pressure
absolute barometric pressure immediately outside the test rig
[SOURCE: ISO 29464:2017, 3.5.50, modified — The word “barometric” has been added.]
3.5
adsorbate capacity
m
s
maximum amount (mass or moles) of a selected adsorbate (3.2) that can be contained in GAPC medium
or device under given test conditions and a specific end point (termination time)
Note 1 to entry: Capacity can also be negative during desorption (3.11).
[SOURCE: ISO 29464:2017, 3.5.12, modified — The symbol m and the words “maximum” and “a specific”
s
have been added.]
3.6
challenge air stream
test contaminant(s) (3.10) of interest diluted to the specified concentration(s) (3.9) of the test prior to
filtration
[SOURCE: ISO 29464:2017, 3.5.13]
3.7
challenge concentration
concentration (3.9) of the test contaminant(s) (3.10) of interest in the air stream prior to filtration
[challenge air stream (3.6)]
[SOURCE: ISO 29464:2017, 3.5.14]
3.8
challenge compound
chemical compound that is being used as the contaminant (3.10) of interest for any given test
[SOURCE: ISO 29464:2017, 3.5.15]
3.9
concentration
C
n
quantity of one substance dispersed in a defined amount of another
Note 1 to entry: Indices “n” denote location.
[SOURCE: ISO 29464:2017, 3.1.7, modified — The symbol C and Note 1 to entry have been added.]
n
ISO 10121-3:2022(E)
3.10
contaminant
substance [solid, liquid or gas (3.14)] that negatively affects the intended use of a fluid
[SOURCE: ISO 29464:2017, 3.1.8, modified — The alternative term “pollutant” has been removed.]
3.11
desorption
process in which adsorbate (3.2) molecules leave the surface of the adsorbent (3.3) and re-enter the air
stream
Note 1 to entry: Desorption is the opposite of adsorption (3.1).
[SOURCE: ISO 29464:2017, 3.5.21]
3.12
downstream
area or region into which fluid flows on leaving the GPACD (3.15)
[SOURCE: ISO 29464:2017, 3.1.11, modified — “GPACD” has been used instead of “test device”.]
3.13
face velocity
volumetric air flow rate divided by the nominal GPACD face area (3.16)
Note 1 to entry: GPACD (3.15) face velocity is expressed in m/s.
[SOURCE: ISO 29464:2017, 3.1.15, modified — The alternative term “filter face velocity” has been
removed; “GPACD face area” and “GPACD face velocity” have been used instead of “filter face area” and
“filter face velocity”.]
3.14
gas
substance whose vapour pressure is greater than the ambient pressure (3.4) at ambient temperature
[SOURCE: ISO 29464:2017, 3.1.28]
3.15
gas-phase air cleaning device
GPACD
assembly of a fixed size enabling the removal of specific gas- or vapour-phase contaminants (3.10)
Note 1 to entry: It is normally box shaped or fits into a box of dimensions between 290 mm × 290 mm × 290 mm
up to approximately 610 mm × 610 mm × 610 mm or 2 ft × 2 ft × 2 ft.
[SOURCE: ISO 29464:2017, 3.5.32, modified — The box dimensions in note 1 to entry have been
modified.]
3.16
GPACD face area
nominal cross-sectional area of the GPACD (3.15)
Note 1 to entry: For the purpose of standardizing measurements, the nominal area is calculated using
610 mm × 610 mm for a full-size filter, 610 mm × 305 mm for a half-size filter and 305 mm × 305 mm for a quarter
size filter.
3.17
heavy duty
HD
duty level (specific dose) of a contaminant (3.10) that corresponds to a removal efficiency (3.29) versus
dose performance for a GPACD (3.15) that is used in challenging environments (e.g. heavily polluted
environments)
ISO 10121-3:2022(E)
3.18
initial dose
D
i
mass per GPACD face area (3.16) that reaches a GPACD (3.15) calculated from air flow in (volume per
time), time, pollution concentration (3.9) (mass per volume) and GPACD face area during the test phase
for determination of the initial efficiency (3.19)
3.19
initial efficiency
E
i
removal efficiency (3.29) of an unexposed filter or GPACD (3.15) calculated as soon as possible after the
start of a test
Note 1 to entry: For gas-phase, this should be calculated as soon as a steady reading can be obtained.
3.20
integrated removal efficiency
E
Σ
numerically integrated fraction or percentage of a challenge contaminant (3.10) that is removed by a
GPACD (3.15) over a specified time or dose period
3.21
light duty
LD
duty level (specific dose) of a contaminant (3.10) that corresponds to a removal efficiency (3.29) versus
dose performance for a GPACD (3.15) that is used as an entry level solution, for low concentrations (3.9)
or intermittent contamination episodes
3.22
medium duty
MD
duty level (specific dose) of a contaminant (3.10) that corresponds to a removal efficiency (3.29) versus
dose performance for a GPACD (3.15) that is used for medium concentrations (3.9) of contamination
3.23
molecular contamination
contamination present in gas (3.14) or vapour phase in an air stream and excluding compounds in
particulate (solid) phase regardless of their chemical nature
[SOURCE: ISO 29464:2017, 3.5.40]
3.24
normalised dose
D
N
mass per GPACD face area (3.16) that reaches a GPACD (3.15) calculated from air flow in (volume per
time), time, pollution concentration (3.9) (mass per volume) and GPACD face area
3.25
normalised retentivity
R
measure of the ability of an adsorbent (3.3) or GPACD (3.15) to resist desorption (3.11) of an adsorbate
(3.2) per GPACD face area (3.16)
Note 1 to entry: Computed as the residual capacity (fraction remaining) after purging the adsorbent with clean,
conditioned air only, following challenge breakthrough and expressed per GPACD face area (3.16).
[SOURCE: ISO 29464:2017, 3.5.53, modified — "normalised" has been added in the term, the symbol R
has been added, "per GPACD face area" has been added in the definition, "and expressed per GPACD face
area" has been added in Note 1 to entry.]
ISO 10121-3:2022(E)
3.26
ppb(v)
parts per billion by volume
concentration (3.9) measure normally used to record ambient levels of outdoor pollution
3 3
Note 1 to entry: Units are mm /m .
[SOURCE: ISO 29464:2017, 3.5.43, modified — "parts per billion by volume" has been moved from the
definition to the admitted term.]
3.27
ppm(v)
parts per million by volume
concentration (3.9) measure normally used to record pollution levels in, e.g. work place safety
3 3 3
Note 1 to entry: Units are cm /m and ml/m .
[SOURCE: ISO 29464:2017, 3.5.44, modified — "parts per million by volume" has been moved from the
definition to the admitted term.]
3.28
pressure drop
Δp
difference in absolute (static) pressure between two points in an airflow system
Note 1 to entry: In this document, pressure drop is measured between points upstream and downstream (3.12)
of the GPACD (3.15).
[SOURCE: ISO 29464:2017, 3.1.36, modified — The alternative terms "resistance to air flow“,
"differential pressure" and "pressure differential" have been removed; the symbol Δp has been added;
and “airflow system" has been used instead of "a system"; the original note 1 to entry has been replaced
by a new one.]
3.29
removal efficiency
E
fraction or percentage of a challenge contaminant (3.10) that is retained by a GPAC medium or device at
a given time
Note 1 to entry: Removal efficiency is also known simply as “efficiency”.
[SOURCE: ISO 29464:2017, 3.5.26, modified — The symbol E has been added.]
3.30
residence time
relative time that an increment of fluid [or contaminant (3.10)] is within the boundaries of the medium
volume
[SOURCE: ISO 29464:2017, 3.5.52, modified — Notes to entry have been removed.]
3.31
retentivity
m
r
measure of the ability of an adsorbent (3.3) or GPACD (3.15) to resist desorption (3.11) of an adsorbate
(3.2)
Note 1 to entry: Computed as the residual capacity (fraction remaining) after purging the adsorbent with clean,
conditioned air only, following challenge breakthrough.
[SOURCE: ISO 29464:2017, 3.5.53, modified — The symbol m has been added.]
r
ISO 10121-3:2022(E)
3.32
very light duty
vLD
removal efficiency (3.29) versus dose performance for a GPACD (3.15) that reaches less than 50 %
efficiency at the LD (3.21) dose
4 Symbols and abbreviated terms
C upstream concentration (ppb, ppm) measured at a position X mm before the device
u
C downstream concentration (ppb, ppm) measured at a position Y mm after the device
d
E initial removal efficiency (%) for the device measured at a low (< 1 ppm) challenge
i
concentration during the initial efficiency test
E initial removal efficiency (%) for the device measured at a high (> 1 ppm) challenge
concentration during the challenge test
E removal efficiency (%) for the device measured at the challenge concentration selected
c
during the capacity test
E efficiency recorded at stop time according to the classification level (%)
td
Q flow used in test (normally the rated flow for the tested device) (m /h) measured at a
position Z mm after the device, see ISO 10121-2
R normalised retentivity (g/m )
v face velocity (m/s) calculated from flow and cross-sectional area of device
f
o
T temperature upstream ( C)
u
o
T temperature downstream ( C)
d
φ relative humidity upstream
U
φ relative humidity downstream
D
D dose (g)
ASHRAE American Society of Heating Refrigerating and Air-conditioning Engineers
FID flame ionization detector
PID photo ionization detector
TVOC total volatile organic compounds
NOTE TVOC is a common way to refer to a larger mix or organic pollutants present either indoors or
outdoors.
5 Classification system for outdoor air
5.1 General
To express filtration performance in an easy to digest way for the target group of non-specialists, e.g.
building and ventilation personnel, a classification using the following three measures shall be used:
a) the initial removal efficiency E of pollution at start;
i
ISO 10121-3:2022(E)
b) a performance duty level (light, medium, heavy);
c) the integrated removal efficiency E calculated for the associated duty level.
∑
Four reference pollutants are selected and shall be used on the basis of their occurrence as outdoor air
pollutants. The duty levels are selected to reflect the typical performance range of devices intended for
the application and are specified for each of the four reference pollutants. The actual tests for initial
efficiency and integrated removal efficiency are performed in sequence where the removal efficiency is
recorded against the upstream dose calculated from concentration, device face area and air flow. The
different terms used in the classification are described in 5.2 to 5.9 and Figure 1 in 5.8 explains how the
different terms are connected.
5.2 Test setup and test parameters
The classification test is made up of four single tests using applicable subclauses of ISO 10121-2 including
ISO 10121-2:2013, 5.4 since the fixed air flows and pollutants selected in the simplified benchmark setup
do not match the scope of this document. The initial efficiency determination is performed according
to ISO 10121-2:2013, 6.3 but with the pollutants and concentrations specified in Table 2 and Table 3.
The test for removal efficiency versus dose is performed according to ISO 10121-2:2013, 6.4 with the
addition of the calculation of dose and by comparing the removal efficiency at different dose levels to
determine if the test is finished or should go on. A retentivity determination performed according to
ISO 10121-2:2013, 6.5 may be optional or compulsory. Generation parameters are specified in Table 1,
Table 2 and Table 3. It is also important to ensure that the GPACD is sealed well during the test to make
sure that actual GPACD performance is being tested.
NOTE Bypass leakage for example defined in EN 1886.
Table 1 — Generation parameters, measurement frequency and demands on accuracy during
test
Parameter Generation Unit Range Absolute Permissible Measurement
parameters accuracy oscillation frequency
during test
C given in Table 2 5 min, 1 h, 4 h,
u
ppb(v) 5 000 to 100 000 ±1,5 % ±3 %
a, b
and Table 3 12 h
b
C n.a. ppb(v) 100 to 100 000 ±1,5 % n.a. < 2 min
d
T 23 ±0,5 °C
U
c
°C n.a. ±0,5 °C same as C
d
T n.a. n.a.
D
φ 50 ±3 %
U
c
% n.a. ±1 % same as C
d
φ n.a. n.a.
D
Q, air flow rate rated air flow m /h n.a.
v , face If rated air flow m/s n.a.
f ±5 % ±3 % same as C
d
velocity not given use
d
2,54
Residence time Determined s n.a. n.a. n.a. n.a.
by v and filter
f
depth
GPACD face n.a. mm 610 × 610 n.a. n.a. n.a.
area for full,
610 × 305
half and quar-
e
ter size
305 × 305
ISO 10121-3:2022(E)
TTaabblle 1 e 1 ((ccoonnttiinnueuedd))
Parameter Generation Unit Range Absolute Permissible Measurement
parameters accuracy oscillation frequency
during test
a
Upstream concentration needs, at a minimum, to be measured before and after an individual test sequence.
b
The time between consecutive downstream measurements should be less than 2 min to allow for sufficient
resolution in Formula (2). Furthermore, the time for the summation increment delta between two efficiency
determinations in Formula (2) shall also be less than 2 min.
c
Useful ranges of T and φ are 15 °C to 45 °C and 30 % to 95 % respectively.
d
The air flow used in the test shall be the rated air flow as per the GPACD label. If the rated air flow is missing
from the label, an air flow corresponding to a face velocity of 2,54 m/s should be used.
e
GPACD face area defines a nominal size but actual minimum size of GPACD to be tested may be down to
590 mm × 590 mm, 590 mm × 285 mm and 285 mm × 285 mm.
5.3 Initial removal efficiency
The initial efficiency is a good measure of the performance of a new product, especially since the initial
efficiency can be advantageously measured at a low concentration close to real outdoor concentration
level.
5.4 Dose concept
The air flow in (volume per time), time, pollution concentration (mass per volume) and GPACD’s face area
can be used to calculate the upstream normalised dose D (mass per specimen face area) that reaches a
N
GPACD. This classification uses a number of specific doses or duty levels; LD, MD and HD (g/m ) related
to GPACD face area and specific concentrations to ensure that the same dose per GPACD area is used in
all classification determinations. These are specified in Table 4. This also makes it possible to classify
all products regardless of performance. In addition, the dose concept reflects a real-life scenario since
the dose, if allowed to enter the building, is the actual stress experienced by building occupants.
5.5 Classes, duty levels and dose
Three duty levels and one entry level are assigned for each pollutant. The duty levels are related to the
performance needed in different locations depending on typical pollutant concentrations, but it is not in
the scope of this document to relate a specific duty level to a certain place or city size. Furthermore, the
definitions of typical low, medium and high concentrations and acceptable levels in a location may also
vary depending on local country regulations. The duty levels are expressed as a series of normalised
dose levels of pollution D (g/m ) relating mass of challenge to GPACD face area. The criterion to be
N
awarded a certain duty level (except for the lowest entry level) is that the removal efficiency shall be
above 50 % when the dose during the test reaches the duty level. The classes are described below.
— Very light duty corresponds to an entry level classification without a demand for a specific
performance. A GPACD having a removal efficiency below 50 % at the LD dose is therefore denoted
“vLD”.
— Light duty corresponds to a removal efficiency versus dose performance for a GPACD that is used as
an entry level solution, for low concentrations or intermittent contamination episodes (one possible
example can be temporary forest fire/haze). LD dose values for the four selected pollutants are
given in Table 4.
— Medium duty corresponds to a removal efficiency versus dose performance for a GPACD that is used
for medium contamination concentrations, e.g. in an urban environment. MD dose values for the
four reference pollutants are given in Table 4.
— Heavy duty corresponds to a removal efficiency versus dose performance for a GPACD that is used
in challenging environments, e.g. heavily polluted or high purity critical environments. HD dose
values for the four reference pollutants are given in Table 4.
ISO 10121-3:2022(E)
This document aims to include, compare, classify and group any possible GPACD that is intended for the
application as defined in the scope. Other standards may look into product recommendations for each
specific environment and contamination levels. The requirement for being awarded very light duty is
therefore open so even products with an initial efficiency below 50 % can be classified and these are
further not required to pass the dose level LD. The requirement for the dose level heavy duty is also
open; but the test shall be terminated as soon as the dose level HD is reached. The duty levels selected
for the different pollutants are given in Table 4.
5.6 Pollutants and concentrations
Ozone, sulphur dioxide, nitrogen dioxide and toluene are the specific pollutants selected and shall be
used. These are typical pollutants in an urban area entering with the outdoor air to general ventilation
for buildings, are considered dangerous to health and are therefore regulated. Concentrations for the
initial efficiency determination and the duty level determination shall be as given in Table 2 and Table 3.
Table 2 — Challenge gas, concentration and test demands for the initial efficiency
determination
Selected Formula Challenge Unit Reference analysis Max permissible efficien-
gas level technique cy decay during test
%
a
Ozone O 150 ppb(v) UV photometric 5
a
Sulphur 450 ppb(v) UV fluorescence 5
SO
dioxide
a
Nitrogen 450 ppb(v) Chemiluminescence 5
NO
dioxide
a a
Toluene C H 900 ppb(v) PID or FID 5
7 8
a
The reference techniques are the preferred ones in this document. However, other techniques may be used provided
that the test supplier can show documented correlation versus the reference technique. In the case of nitrogen dioxides,
there is a demand that the method used can measure both NO and NO upstream and downstream.
Table 3 — Challenge gas, concentration and test demands for the efficiency versus dose
determination
Selected Formula Challenge Unit Reference analysis Min efficiency to contin-
gas level technique ue to next duty level
%
a c
Ozone O 3 ppm(v) UV photometric 50
a c
Sulphur 9 ppm(v) UV fluorescence 50
SO
b 2
dioxide
a c
Nitrogen 9 ppm(v) Chemiluminescence 50
NO
b 2
dioxide
b a a c
Toluene C H 9 ppm(v) PID or FID 50
7 8
a
The reference techniques are the preferred ones in this document. However, other techniques may be used provided
that the test supplier can show documented correlation versus the reference technique. In the case of nitrogen dioxides,
there is a demand that the method used can measure both NO and NO upstream and downstream.
b
A retentivity determination is compulsory.
c
Min efficiency is defined as when the instantaneous value of E becomes less than 50 % for LD, MD and HD. Min
c
efficiency are not applicable to vLD.
5.7 Integrated removal efficiency
The integrated removal efficiency reflects the average performance for the GPACD from the start up to
the highest duty level it can pass with a minimum removal efficiency still above 50 % or reaching HD
(see Figure 1).
ISO 10121-3:2022(E)
5.8 Classification example graph
Figure 1 describes how the classification works for any of the reference pollutants and how the
different terms are related. Clause 6 describes the test sequence for the classification arriving at one
determination for the initial removal efficiency and one performance test where the test object is
subjected to the dose D (g) and the resulting E (%) versus D (g/m ) graphs are made. The specific
c N
duty levels for the four reference pollutants and a classification example are given in Clause 7.
Key
X normalised dose D (g/m ) A GPACD with a ~35 % initial efficiency of E
N c
Y removal efficiency E (%) B GPACD with a ~70 % initial efficiency of E
c c
1 stop of test C GP
...
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