SIST EN ISO 29464:2024
(Main)Cleaning of air and other gases - Vocabulary (ISO 29464:2024)
Cleaning of air and other gases - Vocabulary (ISO 29464:2024)
This document defines terms related to the air filtration industry.
This document is applicable to particulate matter and gas phase air filters and air cleaners used for the general ventilation of inhabited enclosed spaces. It is also applicable to air inlet filters for static or seaborne rotary machines, cleanable filters, UV-C germicidal devices, and stand-alone electrically-powered air cleaners.
It is not applicable to cabin filters for road vehicles or air inlet filters for mobile internal combustion engines for which separate arrangements exist. Dust separators for the purpose of air pollution control are also excluded.
Reinigung von Luft und anderen Gasen - Terminologie (ISO 29464:2024)
Dieses Dokument legt Definitionen zu Begriffen aus der Luftfilterindustrie fest.
Dieses Dokument gilt für Partikel- und Gasphasen Luftfilter sowie Luftreiniger für die allgemeine Belüftung bewohnter umschlossener Räume. Darüber hinaus gilt das Dokument für Luftansaugfilter von stationären oder im Offshore Bereich installierten drehenden Maschinen, abreinigbaren Filtern, UV C Entkeimungseinrichtungen und freistehenden elektrischen Luftreinigern.
Das Dokument gilt nicht für Kabinenfilter für Straßenfahrzeuge oder Lufteinlassfilter für mobile Innenraum-Verbrennungsmotoren, für die separate Vorschriften bestehen. Staubabscheider zur Minderung der Luftverschmutzung sind ebenfalls ausgeschlossen.
Épuration de l'air et autres gaz - Terminologie (ISO 29464:2024)
Le présent document défini les termes relatifs aux industries de la filtration de l’air.
Le présent document s'applique aux épurateurs d’air et filtres d'air pour particules et phases gazeuses utilisés pour la ventilation générale des espaces clos habités. Il s'applique également aux filtres d'admission d'air destinés aux machines rotatives statiques ou maritimes, aux filtres nettoyables, aux dispositifs germicides UV-C, et aux épurateurs d'air autonomes à alimentation électrique.
Il ne s'applique ni aux filtres de cabine de véhicules routiers, ni aux filtres d'admission d'air de moteurs mobiles à combustion interne qui font l'objet de dispositions différentes. Les séparateurs de poussière destinés au contrôle de la pollution de l’air sont également exclus.
Čiščenje zraka in drugih plinov - Terminologija (ISO 29464:2024)
Standard ISO 29464:2017 določa terminologijo za panogo filtracije zraka ter zajema samo izraze in njihove definicije.
Standard ISO 29464:2017 se uporablja za fazne filtre delcev in plinov v zraku ter čistilnike zraka, ki se uporabljajo za splošno prezračevanje bivanjskih zaprtih prostorov. Uporablja se tudi za filtre na dovodu zraka na statičnih ali pomorskih rotacijskih strojih in germicidnih napravah UV-C.
Ne uporablja se za filtre kabin pri cestnih vozilih ali filtre na dovodu zraka na mobilnih motorjih z notranjim zgorevanjem, za katere obstaja ločena ureditev. Izključeni so tudi ločevalniki prahu za nadzor onesnaženosti zraka.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2024
Čiščenje zraka in drugih plinov - Terminologija (ISO 29464:2024)
Cleaning of air and other gases - Vocabulary (ISO 29464:2024)
Reinigung von Luft und anderen Gasen - Terminologie (ISO 29464:2024)
Épuration de l'air et autres gaz - Terminologie (ISO 29464:2024)
Ta slovenski standard je istoveten z: EN ISO 29464:2024
ICS:
01.040.13 Okolje. Varovanje zdravja. Environment. Health
Varnost (Slovarji) protection. Safety
(Vocabularies)
13.040.99 Drugi standardi v zvezi s Other standards related to air
kakovostjo zraka quality
23.120 Zračniki. Vetrniki. Klimatske Ventilators. Fans. Air-
naprave conditioners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 29464
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 01.040.91; 91.140.30 Supersedes EN ISO 29464:2019
English Version
Cleaning of air and other gases - Vocabulary (ISO
29464:2024)
Épuration de l'air et autres gaz - Vocabulaire (ISO Reinigung von Luft und anderen Gasen - Terminologie
29464:2024) (ISO 29464:2024)
This European Standard was approved by CEN on 15 June 2024.
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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 29464:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 29464:2024) 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 January 2025, and conflicting national standards shall
be withdrawn at the latest by January 2025.
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.
This document supersedes EN ISO 29464:2019.
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 29464:2024 has been approved by CEN as EN ISO 29464:2024 without any modification.
International
Standard
ISO 29464
Third edition
Cleaning of air and other gases —
2024-07
Vocabulary
Épuration de l'air et autres gaz — Vocabulaire
Reference number
ISO 29464:2024(en) © ISO 2024
ISO 29464:2024(en)
© ISO 2024
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
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Published in Switzerland
ii
ISO 29464:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Terms related to particle and gas-phase air cleaners .1
3.2 Terms related to particulate matter filters (including general ventilation, EPA, HEPA
and ULPA filters) .6
3.3 Terms related to air intake particle filters for rotary machines . 20
3.4 Terms related to cleanable particle filter degradation .21
3.5 Terms related to gas phase air cleaners (GPAC) . 23
3.6 Terms related to UVC devices . 30
3.7 Terms related to stand-alone electrically-powered air cleaners . 33
Bibliography .35
Index .37
iii
ISO 29464:2024(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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).
This third edition cancels and replaces the second edition (ISO 29464:2017), which has been technically
revised.
The main changes are as follows:
— addition of 3.7 covering stand-alone electrically-powered air cleaners;
— addition of new terms and definitions in 3.5 and 3.6 due to the publication of new standards.
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
International Standard ISO 29464:2024(en)
Cleaning of air and other gases — Vocabulary
1 Scope
This document defines terms related to the air filtration industry.
This document is applicable to particulate matter and gas phase air filters and air cleaners used for the
general ventilation of inhabited enclosed spaces. It is also applicable to air inlet filters for static or seaborne
rotary machines, cleanable filters, UV-C germicidal devices, and stand-alone electrically-powered air
cleaners.
It is not applicable to cabin filters for road vehicles or air inlet filters for mobile internal combustion engines
for which separate arrangements exist. Dust separators for the purpose of air pollution control are also
excluded.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
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 Terms related to particle and gas-phase air cleaners
3.1.1
air cleaner
device for removing contaminants (3.1.12) from air in a ventilation system, building or other enclosed space
3.1.2
robotic air cleaner
air cleaner that operates and changes its physical location autonomously without user intervention
Note 1 to entry: The robotic air cleaner can consist of a part that houses the air cleaning function and can have a
docking station and/or other accessories to assist its operation.
3.1.3
fresh-air air cleaner
air cleaner connected to the external environment, which provides pollutant-reduced outdoor air into an
indoor space
Note 1 to entry: The fresh-air air cleaner can also include other auxiliary functions, such as heat exchange.
3.1.4
air velocity
rate of air movement
Note 1 to entry: It is expressed in m/s (fpm).
ISO 29464:2024(en)
3.1.5
bypass
proportion of the challenge air stream (3.5.14) that passes around or through an air cleaner (3.1.1) without
interacting with the air cleaner
3.1.6
calibrate
to compare readings from the instrument to be calibrated with those from a reference device
3.1.7
capture
removal of contaminants from an air stream
3.1.8
classification
allocation of air cleaners into groups and classes according to relevant aspects of their air cleaning
performance
3.1.9
clean side
downstream side of an air cleaner element
3.1.10
combination product
air cleaner that includes a secondary function besides air cleaning within the same housing, such as
humidifying, dehumidifying, heating, or air conditioning
3.1.11
concentration
quantity of one substance dispersed in a defined amount of another
3.1.12
contaminant
pollutant
substance (solid, liquid or gas) that negatively affects the intended use of a gas
3.1.13
contamination
pollution
presence of a substance that negatively affects the intended use of a gas
3.1.14
decontamination factor
ratio of the contaminant (3.1.12) concentration or particle number upstream of an air cleaner to the
contaminant concentration (3.1.11) or particle number downstream of the air cleaner
Note 1 to entry: The decontamination factor can also be expressed as 1/(1 – overall efficiency) or as 1/penetration.
3.1.15
dirty side
upstream side of an air cleaner element
3.1.16
downstream
area or region into which air flows on leaving an air cleaner
3.1.17
removal efficiency
fraction or percentage of a challenge contaminant (3.1.12) that is removed by an air cleaner
ISO 29464:2024(en)
3.1.18
average removal efficiency
value of removal efficiency which results from averaging the removal efficiencies determined over a number
of discrete time intervals up to the end of an efficiency test
3.1.19
effluent
gas or liquid discharged from a given source into the external environment
Note 1 to entry: This is a general term describing any gas or liquid discharged from a given source; in this context, the
discharged liquid or gas may contain associated gaseous, liquid and/or particulate contaminants (3.1.12).
3.1.20
face velocity
volumetric air flow rate divided by the nominal air cleaner face area (3.1.23)
Note 1 to entry: air cleaner face velocity is expressed in m/s (fpm).
3.1.21
filter
air filter
device for separating solid or liquid particles or gaseous contaminant (3.1.12) from an air stream passing
through the device
Note 1 to entry: The device is generally formed of a layer or layers of porous, fibrous or granular material.
Note 2 to entry: Air being cleaned by a filter shall pass through the filter, whereas an air cleaner (3.1.1) can reduce air
contamination (3.1.13) by any method.
3.1.22
filter face area
air cleaner face area
cross-sectional face area of the air cleaner through which air flows into the device
3.1.23
nominal filter face area
nominal air cleaner face area
cross-sectional face area of the air cleaner through which air flows into the device calculated using
dimensions rounded up to the nearest integer
3.1.24
filter insert
replaceable part of a filter which contains the filter medium but which can only operate mounted inside a frame
3.1.25
filter medium
material used for separating contaminants from air and characterized by its porous structure
3.1.26
filter medium area
area of filter medium (3.1.25) contained in the filter
Note 1 to entry: For filters with pleats or folds, the filter medium area can be much larger than the filter face area
(3.1.22).
3.1.27
effective filter medium area
area of the filter medium (3.1.25) contained in the filter through which air passes during operation
Note 1 to entry: This excludes areas covered by sealant, spacers, struts, etc.
2 2
Note 2 to entry: Effective filter medium area is expressed in m (ft ).
ISO 29464:2024(en)
3.1.28
medium velocity
volumetric air flow rate divided by the effective filter medium area (3.1.27) of the filter (3.1.21)
Note 1 to entry: Filter medium velocity is expressed in m/s (fpm).
Note 2 to entry: In devices where the filter medium surface area has been increased by use of pleats, folds or bags, the
filter medium velocity may be much less than the filter face velocity (3.1.20).
3.1.29
flow rate
air flow rate
volume of air flowing through an air cleaner per unit time
3.1.30
design flow rate
design air flow rate
air flow rate specified by the manufacturer
3.1.31
user nominal air volume flow rate
volume air flow rate specified by the user, at which an air cleaner is used or tested in situ
Note 1 to entry: This flow rate may be different from the one specified by the manufacturer.
3.1.32
test flow rate
rate of air flow used for testing
Note 1 to entry: The flow rate is usually expressed in volumetric units [m /h (cfm)].
Note 2 to entry: Test flow rate may differ from the manufacturer’s specified flow through the air cleaner.
3.1.33
rated flow
flow rate through an air cleaner, either as stated by the manufacturer for defined conditions of use or as
agreed between the interested parties for a particular installation
Note 1 to entry: The manufacturer’s rated flow may differ from the test air flow rate (3.1.32).
3.1.34
gas
substance whose vapour pressure is greater than the ambient pressure (3.5.53) at ambient temperature
3.1.35
header frame
integral rigid frame of an air cleaner with a flange extending beyond the dimensions of the frame walls,
enabling it to be fastened and sealed against the holding frame (3.1.36)
3.1.36
holding frame
rigid structural frame, part of an air handling system into which an air cleaner is fastened and sealed
3.1.37
housing
device used to hold an air cleaner
3.1.38
hood
inlet device for an air extraction system
ISO 29464:2024(en)
3.1.39
integrity test
in situ test procedure for quantifying the unfiltered leakage of the system
3.1.40
leak
point in a filter at which the local penetration exceeds a given value
3.1.41
penetration
breakthrough
ratio of contaminant concentration downstream of an air cleaner to the upstream (challenge) concentration
(3.1.11)
Note 1 to entry: Sometimes expressed as a percentage.
Note 2 to entry: Penetration (P) is related to removal efficiency (E) by the expression: E = (1 – P) × 100 %.
Note 3 to entry: Penetration is related to the decontamination factor (DF) (3.1.14) by the expression: DF = 1/penetration.
3.1.42
reference device
primary device possessing accurately known parameters used as a standard for calibrating secondary devices
Note 1 to entry: Reference particle filters are laboratory tested for removal efficiency by particle size (3.2.141) and/or
resistance to air flow.
3.1.43
resistance to air flow
differential pressure
pressure differential
pressure drop
difference in absolute (static) pressure between two points in an air flow system
Note 1 to entry: Resistance to air flow is expressed in Pa (inches of water).
3.1.44
test air
air being used for testing purposes
3.1.45
test device
device under test
DUT
air cleaner that is being subjected to performance testing
3.1.46
upstream
area or region from which air flows as it enters an air cleaner
3.1.47
washer
dust separator (3.2.152), droplet separator (3.2.151) or gas purifier (3.5.41) that depends on a liquid acting as
a collecting medium for its operation
ISO 29464:2024(en)
3.2 Terms related to particulate matter filters (including general ventilation, EPA, HEPA and
ULPA filters)
3.2.1
aerosol
solid and/or liquid particles suspended in a gas
Note 1 to entry: Based on European Union and US Environmental Protection Agency information, atmospheric aerosol
is divided into four size categories: the ultrafine range x < 0,1 µm, the fine range 0,1 µm ≤ x ≤ 2,5 µm, the coarse range
2,5 µm < x ≤ 10 µm, and the large coarse range x > 10 µm, whereby x is the aerodynamic diameter of the particle.
3.2.2
liquid phase aerosol
liquid particles suspended in a gas
3.2.3
monodisperse aerosol
aerosol, the width of whose distribution function, described by the geometric standard deviation σg, is less
than 1,15 µm
3.2.4
aerosol neutralisation
action of bringing the aerosol to a Boltzmann charge equilibrium distribution with bipolar ions
Note 1 to entry: Neutralization should not be confused with discharging.
3.2.5
aerosol photometer
instrument that measures the intensity of light scattered by an aerosol sample
3.2.6
polydisperse aerosol
aerosol, the width of whose distribution function, described by the geometric standard deviation σg,
exceeds 1,5 µm
3.2.7
quasi-monodisperse aerosol
aerosol, the width of whose distribution function, described by the geometric standard deviation σg, is
between 1,15 µm and 1,5 µm
3.2.8
reference aerosol
defined approved aerosol for test measurement within a specific size range
3.2.9
solid phase aerosol
solid particles suspended in a gas
3.2.10
test aerosol
aerosol used for determining the particle removal efficiency performance of the device being tested or for
calibrating particle measurement devices
3.2.11
agglomerate
collection of solid particles adhering to each other
3.2.12
agglomeration
action leading to the formation of agglomerates (3.2.11)
ISO 29464:2024(en)
3.2.13
agglutination
action of joining, by impact (3.2.85), solid particles coated with a thin adhesive layer or of trapping solid
particles by impact on a surface coated with adhesive
3.2.14
aggregate
relatively stable assembly of dry particles, formed under the influence of physical forces
3.2.15
arrestance
gravimetric 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: This measure is expressed as a mass percentage.
3.2.16
average arrestance
average gravimetric arrestance
ratio of the total mass of a standard test dust retained by the filter to the total mass of dust fed up to final
test pressure differential
3.2.17
initial arrestance
initial gravimetric arrestance
ratio of the mass of a standard test dust retained by the filter to the mass of dust fed after the first increment
of dust load
Note 1 to entry: This measure is expressed as a mass percentage.
Note 2 to entry: For example, in ISO 29461-1 or ISO 16890-3 procedure.
3.2.18
ash
solid residue of effectively complete combustion
3.2.19
fly ash
ash entrained by combustion gases
3.2.20
bioaerosol
particles of biological origin suspended in a gaseous medium
Note 1 to entry: Bioaerosol particles include viruses, bacteria, fungi, pollen, plant debris, fragments of these and their
derivatives such as endotoxins, glucans, allergens and mycotoxins.
Note 2 to entry: The size of a bioaerosol particle can be larger if it is encased within a liquid drop, for example a virus
in sputum
3.2.21
burst pressure
value of differential pressure across a filter, above which damage/destruction of the filter medium (3.1.25) or
the structure occurs
3.2.22
calibration particle
mono-disperse spherical particle with a known mean particle size
EXAMPLE Polystyrene latex (PSL) particle traceable to an international standard of length where the standard
uncertainty of the mean particle size is equal to or less than ±2,5 %.
ISO 29464:2024(en)
Note 1 to entry: The refractive index of (PSL) calibration particles is close to 1,59 at a wavelength of 589 nm (sodium D line).
3.2.23
dust holding capacity
DHC
dust loading capacity
test dust capacity
TDC
total mass of loading dust captured by an air-cleaning device up to the final test resistance to air flow
3.2.24
cleaning
removal of a deposit of solid and/or liquid particles
3.2.25
clogging
deposition, progressive or otherwise, of solid or liquid particles on or within a filter medium (3.1.25), causing
the flow to be obstructed
3.2.26
coagulation losses
particle losses due to collision and adhesion of particles
Note 1 to entry: Coagulation affects the measured particle parameters as follows: the particle number concentration
(3.2.113) decreases, the particle mass concentration (3.1.11) remains the same and the mean particle size (3.2.117)
increases.
3.2.27
coalescence
action by which liquid particles in suspension (3.2.155) unite to form larger particles
3.2.28
coefficient of variation
CV
standard deviation of a group of measurements divided by the mean
3.2.29
coincidence error
error which occurs because at a given time more than one particle is contained in the measurement volume
of a particle counter
Note 1 to entry: The coincidence error leads to a measured number concentration (3.1.11) which is too low and a value
for the particle diameter (3.2.106) which is too high.
3.2.30
correlation ratio
measure of bias between the upstream and downstream sampling systems
Note 1 to entry: This is expressed as the downstream particle concentration divided by the upstream particle
concentration measured without filter in place.
3.2.31
counting efficiency
ratio of detected number concentration (3.1.11) of particles to the actual number concentration of particles
in a given size or range of sizes
Note 1 to entry: This is usually expressed as a percentage.
Note 2 to entry: The counting efficiency depends on the particle size (3.2.117) and decreases progressively in the
proximity of the lower detection limit of the particle counter.
ISO 29464:2024(en)
3.2.32
counting rate
number of counting events per unit time
3.2.33
cyclone
dust separator (3.2.152) or droplet separator (3.2.151) utilizing essentially the centrifugal force derived from
the motion of the gas
3.2.34
DiEthylHexylSebacate
DEHS
liquid used for generating the DEHS test aerosol (3.2.10)
3.2.35
equivalent diameter
diameter of a spherical particle which will give behaviour equivalent to that of the particle being examined
3.2.36
median diameter
diameter of the particle for which the cumulated volume fraction is equal to 50 % on a cumulated volume
particle size distribution curve
3.2.37
count median diameter
number median diameter
CMD
50th percentile of the number distribution of an aerosol
Note 1 to entry: 50 % of the particles are smaller than the count median diameter and 50 % are larger than the count
median diameter.
3.2.38
diluter
dilution system
system for reducing the sampled concentration (3.1.11) to avoid coincidence error in the particle counter
3.2.39
dispersion
operation as a result of which solid particles or liquid particles are distributed in a gas
Note 1 to entry: Also applied to a two-phase system in which one phase, known as the “disperse phase”, is distributed
throughout the other, known as the “continuous medium”. For example, dioctyl phthalate (DOP) liquid or liquids with
similar physical properties, are dispersed in air to generate a test aerosol (3.2.10).
3.2.40
dioctyl phthalate
challenge contaminant used to determine particle removal performance of HEPA filters
Note 1 to entry: Also known by the acronym DOP.
3.2.41
droplet
liquid particle of small mass, capable of remaining in suspension (3.2.155) in a gas
Note 1 to entry: In some turbulent systems, for example clouds, its diameter can reach 200 μm.
3.2.42
dust
airborne solid particles which settle by gravity in calm conditions
ISO 29464:2024(en)
3.2.43
dust control
whole of the processes for the separation of solid particles from a gas stream in which they are suspended
Note 1 to entry: By extension, also the activities involved in the construction and commissioning of a dust separator
(3.2.152).
3.2.44
dust feeder
device which is used to distribute test dust to the filter
3.2.45
loading dust
synthetic test dust
synthetic dust formulated specifically for determination of the test dust capacity and arrestance of air filters
(3.1.21)
Note 1 to entry: A number of loading dusts are in use; some of them are defined in ISO 15957.
3.2.46
collection efficiency
ratio of the quantity of particles retained by a separator (3.2.150) to the quantity entering it with regard to
filters (3.1.21), dust separators (3.2.152) and droplet separators (3.2.151)
Note 1 to entry: This measure is normally expressed as a percentage.
3.2.47
elutriation
method of separating a mixture of particles according to their settling velocities within a gas
3.2.48
superficial face area
cross-sectional area of the filter element (3.2.59) through which the air flow passes
3.2.49
brush filter
air filter (3.1.21) in which the medium consists of a screen of intermeshing brushes
3.2.50
cartridge filter
compact filter often of cylindrical design
3.2.51
cellular filter
replaceable filter insert (3.1.24) which is or can be installed in a multiple bank or wall structure
Note 1 to entry: Examples of these are HEPA filters (3.2.66), rigid bags and panels.
3.2.52
ceramic filter
filter with a medium consisting of ceramic fibres or porous ceramic
3.2.53
charged filter
electret filter
filter with an electrostatically charged medium
3.2.54
filter class
range of filtration performances clearly defined by lower and upper limit values
ISO 29464:2024(en)
3.2.55
cleanable filter
filter designed to permit the removal of collected dust by application of an appropriate technique
3.2.56
coarse filter
filtration device with particle removal efficiency (3.1.17) < 50 % in the ePM particle range
3.2.57
disposable filter
filter which is not intended to be cleaned or regenerated for reuse
3.2.58
efficient particulate air filter
EPA filter
filter with performance complying with requirements of filter classes ISO 15 E to ISO 25 E as specified in
ISO 29463-1
Note 1 to entry: EPA filters cannot be and will not be leak tested.
Note 2 to entry: The European Committee for Standardization CEN has not adopted ISO 29463-1. EPA filters are
covered in Europe by the European standard EN 1822-1. EN 1822-1:2019, Table A.1 gives a side-by-side comparison of
EN 1822-1 and ISO 29463-1.
3.2.59
filter element
structure made of the filtering material, its supports and its interfaces with the filter housing
3.2.60
fabric filter
filter medium (3.1.25) manufactured either from woven or non-woven textile or a combination of both
Note 1 to entry: The term is most often applied to dust collectors. In these devices the filtering is effectively carried
out by a bed of deposited dust, the textile providing a supporting substrate.
3.2.61
fibrous filter
filter comprising a medium made up of fibres
Note 1 to entry: The efficiency of these filters is derived from the presence of very fine fibres which are supported by
coarser fibres in a relatively open structure.
Note 2 to entry: Fibrous filters are usually disposable.
3.2.62
final filter
air filter (3.1.21) used to collect the loading dust passing through or shedding (3.2.116) from the filter under test
3.2.63
fine filter
filtration device with particle removal efficiency ≥50 % in the PM particle range
3.2.64
filter group designation
designation of a group of filters (3.2.65) fulfilling certain requirements in the filter classification
Note 1 to entry: ISO 16890-1 defines four groups of filters. Group designations are “ISO coarse”, “ISO ePM10”, “ISO
ePM2,5” and “ISO ePM1”.
3.2.65
group of filters
comprises filters of more than one adjacent class within a performance spectrum
ISO 29464:2024(en)
3.2.66
high efficiency particulate air filter
HEPA filter
filter with performance complying with requirements of filter classes ISO 35 H to ISO 45 H as specified in
ISO 29463-1
3.2.67
filter installation
filtration devices and systems such as a single filter or a group of filters (3.2.65) mounted together with the
same inlet and outlet of air
3.2.68
metal filter
filter with a medium consisting of metal mesh(es), fibres or porous metal
3.2.69
filter pack
filtering material in a preformed shape being a part of a complete filter
3.2.70
panel filter
shallow parallel-faced filter element (3.2.59) or cell
3.2.71
particle air filter
filter designed to remove suspended particles from air flowing through it
3.2.72
pocket filter
bag filter
filter in which the medium is formed into pockets or bags
3.2.73
reference filter
dry media-type filter that has been laboratory tested for removal efficiency by particle size
3.2.74
renewable media filter
filter in which the medium can be replaced
3.2.75
roll filter
filter incorporating a means for advancing new medium to replace used medium
3.2.76
self-cleaning filter
filter having an inbuilt mechanism for removing collected contaminants (3.1.12)
3.2.77
filter type
designation of the structure and test regime of a filter
3.2.78
ultra low penetration air filter
ULPA filter
filter with performance complying with the requirements of filter classes ISO 50 U – ISO 75 U as specified in
ISO 29463-1
Note 1 to entry: The European Committee for Standardization CEN has not adopted ISO 29463-1. ULPA filters are
covered in Europe by the European standard EN 1822-1. EN 1822-1:2019, Table A.1 gives a side-by-side comparison of
EN 1822-1 and ISO 29463-1.
ISO 29464:2024(en)
3.2.79
sampling volume flow rate
fraction of the total flow stream required by the instrument used for determining the characteristics of the air
3.2.80
service flow
gas flow rate through a separator (3.2.150) under given service conditions
3.2.81
folded pack
pack of the filter medium (3.1.25) formed by uniform individual folds
3.2.82
fume
solid aerosol generated by condensation, generally after evaporation from melted substances such as metals
and often accompanied by chemical reactions such as oxidation
Note 1 to entry: In popular usage, gaseous effluent, often unpleasant and malodorous, which can arise from chemical
processes.
3.2.83
general ventilation
process of moving air from outside the space, recirculated air, or a combination of these into or about a space
or removing air from the space
3.2.84
grit
airborne solid particles in the atmosphere or flues
Note 1 to entry: In the UK, defined to be of size greater than 75 μm.
3.2.85
impact
collision of two particles with each other, or of a particle with a solid or liquid surface
3.2.86
impaction
inertial impingement
inertial separation due to mass and velocity of a particle causing divergence from the air flow stream lines
onto individual filter fibres
3.2.87
isoaxial sampling
sampling in which the flow in the sampler inlet is moving in the same direction as the flow being sampled
3.2.88
isokinetic sampling
technique for air sampling such that the probe inlet air velocity (3.1.4) is the same as the velocity of the air
surrounding the sampling point
3.2.89
KCl
solid potassium chloride particles generated from an aqueous solution and used as test aerosol (3.2.10)
3.2.90
measuring procedure with fixed sampling probes
determination of the overall efficiency (3.2.137) using fixed sampling probes upstream and downstream
(3.1.16) of the filter being tested
ISO 29464:2024(en)
3.2.91
minimum fractional test efficiency
fractional removal efficiency measured according to ISO 16890-2 after applying the conditioning method
defined in ISO 16890-4
3.2.92
mist
suspension (3.2.155) of droplets in a gas
3.2.93
particle
small discrete mass of solid or liquid matter
3.2.94
particle bounce
behaviour of particles that impinge on the filter medium without being retained
Note 1 to entry: Particle bounce is a different process from particle re-entrainment.
3.2.95
particle concentration method
method that can determine the total concentration of particles in the aerosol either by multiple particle
counting or chemical concentrations
Note 1 to entry: No particle size classification can be determined by this method.
3.2.96
particle counter
device for detecting and counting numbers of discrete airborne particles present in a sample of air
3.2.97
allowable measurable concentration of the particle counter
fifty percent of the maximum measurable concentration as stated by the manufacturer of the particle counter
(3.2.96)
3.2.98
particle counter border zone error
particle sizing error that occurs when particles pass through the optical border of the sensing zone and
receive less illumination
Note 1 to entry: The border zone error is device and particle size dependent and has a direct effect on the size
resolution.
Note 2 to entry: Due to the border zone error, the particle size (3.2.117) is underestimated.
Note 3 to entry: The larger the particle to be measured, the bigger the border zone error.
3.2.99
particle counter calibration curve
graph depicting the relationship between scattered light intensity and particle size
Note 1 to entry: For the clear particle size and quantity determination, an unambiguous, monotonically increasing
calibration curve offers advantages. This enables narrower size intervals to be chosen.
3.2.100
condensation particle counter
CPC
type of optical particle counter (3.2.101) in which very fine airborne particles are enlarged by condensation
to a size which can readily be counted by other particle counting methods
Note 1 to entry: It can provide data on particle numbers (3.2.112) but not the original size distribution.
ISO 29464:2024(en)
3.2.101
optical particle counter
OPC
instrument that counts the number of particles and measures their size using the light scattering method or
the light extinction method
3.2.102
particle counter sizing accuracy
measure of the ability of an instrument to correctly determine the size of a reference particle of known size
Note 1 to entry: Sizes are usually stated in μm.
3.2.103
particle counter sizing resolution
measure of the ability of an instrument to precisely differentiate particles of different sizes
3.2.104
particle counter sampling flow rate
particle counter sampling air flow
volumetric flow rate through the instrument
Note 1 to entry: Any error in the volumetric flow rate will affect the reported particle number concentration (3.2.113).
3.2.105
particle counting and sizing method
particle counting method which allows both the determination of the number of particles and also the
classification of the particles according to size
EXAMPLE By using an optical particle counter (3.2.101).
3.2.106
particle diameter
geometric diameter (equivalent spherical, optical or aerodynamic, depending on context) of the particles of
an aerosol
Note 1 to entry: Particle diameter is often referred to simply as "particle size".
3.2.107
count mean particle diameter
number mean particle diameter
geometric average of the lower and upper limit of the size range
3.2.108
mean diameter
mean particle diameter
geometric mean of the upper and lower border diameters in a size range
3.2.109
particle flow distribution
distribution of the particle flow over a plane at right angles to the direction of flow
3.2.110
particle flow rate
number of particles that are measured or that flow past a specified cross-section per unit time
3.2.111
particle lower size limit
smallest particle diameter (3.2.106) with a counting efficiency of 0,5 ± 0,15 (50 % ± 15 %)
3.2.112
particle number
number of particles present in a defined group
ISO 29464:2024(en)
3.2.113
particle number concentration
number of particles per unit of volume of air
3.2.114
particle production rate
number of particles produced per unit time by an aerosol generator
3.2.115
particle re-entrainment
re-entrainment
release to the air flow of particles previously captured on the filter medium
3.2.116
particle shedding
shedding
release to the air flow of particles due to particle bounce (3.2.94) and re-entrainment effects and to the
release of fibres or particulate matter (3.2.123) from the filter or filtering material
Note 1 to entry: Shedding typically refers to particles that are measured downstream of the filter when there is
nothing injected upstream of the filter.
3.2.117
particle size
geometric diameter (equivalent spherical, optical or aerodynamic, depending on context) of the particles of
an aerosol
3.2.118
particle size analysis
technique used to measure the size distribution of an assembly of particles
3.2.119
particle size distribution
presentation, in the form of tables of numbers or of graphs, of the experimental results obtained using a
method or an apparatus capable of measuring the equivalent diameter of particles in a sample or capable of
giving the proportion of particles for which the equivalent diameter lies between defined limits
3.2.120
most penetrating particle size
MPPS
particle size (3.2.117) at which the minimum of the particle size efficiency curve occurs under test conditions
Note 1 to entry: This MPPS is dependent on the filter medium (3.1.25) and the test conditions.
3.2.121
particle size range
defined particle counter channel
3.2.122
particle upper size limit
largest particle diameter (3.2.106) with a counting efficiency of 0,5 ± 0,15 (50 % ± 15 %)
3.2.123
particulate matter
PM
solid and/or liquid particles
3.2.124
particulate matter removal efficiency
ePM
x
removal efficiency (3.1.17) of an air cleaning device in reducing the mass concentration of particles with an
optical diameter between 0,3 µm and x µm
ISO 29464:2024(en)
3.2.125
particulate matter
PM
particulate matter (3.2.123) which passes through a size-selective inlet with a 50 % efficiency cutoff at
10 μm aerodynamic diameter
3.2.126
particulate matter
PM
2,5
particulate matter (3.2.123) which passes thr
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