Cleaning of air and other gases - Terminology (ISO 29464:2017)

ISO 29464:2017 establishes a terminology for the air filtration industry and comprises terms and definitions only.
ISO 29464:2017 is applicable to particulate 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 and UV-C germicidal devices.
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 29464:2017)

Dieses Dokument legt die Terminologie für die Luftfilterindustrie fest und enthält lediglich Begriffe und Definitionen.
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 Turbinen und Verdichtern sowie UV-C-Entkeimungseinrichtungen.
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 29464:2017)

ISO 29464:2017 établit une terminologie destinée aux industries de la filtration de l'air et comprend uniquement des termes et des définitions.
ISO 29464:2017 s'applique aux épurateurs et filtres d'air pour particules et phases gazeuses utilisés pour la ventilation générale des espaces clos habités. Elle s'applique également aux filtres d'admission d'air destinés aux machines rotatives statiques ou maritimes, ainsi qu'aux dispositifs germicides UV-C.
Elle 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 employés pour le contrôle de la pollution de l'air sont également exclus.

Čiščenje zraka in drugih plinov - Terminologija (ISO 29464:2017)

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

Status
Published
Public Enquiry End Date
10-Jul-2019
Publication Date
27-Oct-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
17-Oct-2019
Due Date
22-Dec-2019
Completion Date
28-Oct-2019

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SLOVENSKI STANDARD
SIST EN ISO 29464:2019
01-december-2019
Nadomešča:
SIST EN 14799:2007
Čiščenje zraka in drugih plinov - Terminologija (ISO 29464:2017)
Cleaning of air and other gases - Terminology (ISO 29464:2017)
Reinigung von Luft und anderen Gasen - Terminologie (ISO 29464:2017)
Épuration de l'air et autres gaz - Terminologie (ISO 29464:2017)
Ta slovenski standard je istoveten z: EN ISO 29464:2019
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
SIST EN ISO 29464:2019 en,fr,de

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

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SIST EN ISO 29464:2019
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SIST EN ISO 29464:2019
EN ISO 29464
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 01.040.91; 91.140.30 Supersedes EN 14799:2007
English Version
Cleaning of air and other gases - Terminology (ISO
29464:2017)

Épuration de l'air et autres gaz - Terminologie (ISO Reinigung von Luft und anderen Gasen - Terminologie

29464:2017) (ISO 29464:2017)
This European Standard was approved by CEN on 12 August 2019.

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, Turkey 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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 29464:2019 E

worldwide for CEN national Members.
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SIST EN ISO 29464:2019
EN ISO 29464:2019 (E)
Contents Page

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

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SIST EN ISO 29464:2019
EN ISO 29464:2019 (E)
European foreword

The text of ISO 29464:2017 has been prepared by Technical Committee 142 "Cleaning equipment for air

and other gases” of the International Organization for Standardization (ISO) and has been taken over as

EN ISO 29464:2019 by 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 April 2020, and conflicting national standards shall be

withdrawn at the latest by April 2020.

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 14799:2007.

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, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 29464:2017 has been approved by CEN as EN ISO 29464:2019 without any modification.

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SIST EN ISO 29464:2019
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SIST EN ISO 29464:2019
INTERNATIONAL ISO
STANDARD 29464
Second edition
2017-09
Cleaning of air and other gases —
Terminology
Épuration de l’air et autres gaz — Terminologie
Reference number
ISO 29464:2017(E)
ISO 2017
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SIST EN ISO 29464:2019
ISO 29464:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, 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 2017 – All rights reserved
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SIST EN ISO 29464:2019
ISO 29464:2017(E)
Contents Page

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

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

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

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

3.1 General, applicable to both particulate and gas-phase air cleaners ......................................................... 1

3.2 Particulate filters (including general ventilation, HEPA and ULPA filters) ......................................... 5

3.3 Air intake particulate filters for rotary machines ..................................................................................................20

3.4 Cleanable particulate filter degradation ........................................................................................................................22

3.5 Gas phase air cleaners (GPAC) ................................................................................................................................................24

3.6 UVC devices .............................................................................................................................................................................................30

Bibliography .............................................................................................................................................................................................................................33

© ISO 2017 – All rights reserved iii
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SIST EN ISO 29464:2019
ISO 29464:2017(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 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 the following

URL: w w w . i s o .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 142, Cleaning equipment for air and

other gases.

This second edition of ISO 29464 cancels and replaces the first edition (ISO 29464:2011), which has

been technically revised.
iv © ISO 2017 – All rights reserved
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SIST EN ISO 29464:2019
INTERNATIONAL STANDARD ISO 29464:2017(E)
Cleaning of air and other gases — Terminology
1 Scope

This document establishes a terminology for the air filtration industry and comprises terms and

definitions only.

This document is applicable to particulate 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 and UV-C germicidal devices.

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
For the purpose of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1 General, applicable to both particulate and gas-phase air cleaners
3.1.1
air cleaner

device intended to remove contaminants (3.1.8) from air in a ventilation system or enclosed space

3.1.2
air velocity
rate of air movement
Note 1 to entry: It is expressed in m/s (fpm) to three significant figures.
3.1.3
bypass
air filter bypass
sneakage

proportion of the challenge air stream (3.5.13) that passes around an air cleaner (3.1.1) without

interacting with the air cleaner
3.1.4
calibrate

to compare readings from the instrument to be calibrated with those from a reference device

© ISO 2017 – All rights reserved 1
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SIST EN ISO 29464:2019
ISO 29464:2017(E)
3.1.5
capture

extraction of particles, liquid particles or gases, close to their sources for purposes of collection or

sampling
3.1.6
classification

allocation of filters into groups and classes according to relevant aspects of their filtration performance

3.1.7
concentration
quantity of one substance dispersed in a defined amount of another
3.1.8
contaminant
pollutant

substance (solid, liquid or gas) that negatively affects the intended use of a fluid

3.1.9
contamination
pollution
presence of a substance that negatively affects the intended use of a fluid
3.1.10
decontamination factor

ratio of the contaminant (3.1.8) concentration or particle number upstream of the test device to the

contaminant concentration (3.1.7) or particle number downstream of the device

Note 1 to entry: The decontamination factor can also be expressed as 1/(1 – overall efficiency) or as 1/penetration.

3.1.11
downstream
area or region into which fluid flows on leaving the test device
3.1.12
efficiency
filter efficiency

fraction or percentage of a challenge contaminant (3.1.8) that is removed by a test device

3.1.13
average efficiency

value of efficiency which results from averaging the efficiencies determined over a number of discreet

intervals up to the final pressure differential
3.1.14
effluent
fluid discharged from a given source into the external environment

Note 1 to entry: This is a general term describing any fluid discharged from a given source; in this context, the

discharged fluid may be liquid or gaseous and may contain associated liquid and/or particulate contaminants

(3.1.8).
3.1.15
face velocity
filter face velocity
volumetric air flow rate divided by the nominal filter face area (3.1.18)
Note 1 to entry: filter face velocity is expressed in m/s.
2 © ISO 2017 – All rights reserved
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SIST EN ISO 29464:2019
ISO 29464:2017(E)
3.1.16
filter
air filter

device for separating solid or liquid particles or gaseous contaminant (3.1.8) 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 must pass through the filter, whereas an air cleaner (3.1.1) can

reduce air contamination (3.1.9) by any method.
3.1.17
filter face area

cross-sectional face area of the filter including the header frame when viewed from the direction of air

flow using exact dimensions
3.1.18
nominal filter face area

cross-sectional face area of the filter including the header frame when viewed from the direction of air

flow using nominal dimensions
3.1.19
filter insert

replaceable part of a filter which contains the filter medium but which can only operate mounted

inside a frame
3.1.20
filter medium

material separating particulate matter (3.2.139) from gases and characterized by its separating

structure and its structural and/or textile-technological characteristics
3.1.21
filter medium area
area of filter medium (3.1.20) contained in the filter

Note 1 to entry: For filters with pleats or folds, the filter medium area may be much larger than the filter face area

(3.1.17).
3.1.22
effective filter medium area
effective filtering area
exposed filter area

area of the filter medium (3.1.20) contained in the filter through which air passes during operation

Note 1 to entry: This excludes areas covered by sealant, spacers, struts, etc.
Note 2 to entry: Effective filter medium area is expressed in m .
3.1.23
filter medium velocity
media velocity
medium velocity

volumetric air flow rate divided by the effective filter medium area (3.1.22) of the filter element (3.2.77)

Note 1 to entry: Filter medium velocity is expressed in m/s.

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 (3.1.15).

© ISO 2017 – All rights reserved 3
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SIST EN ISO 29464:2019
ISO 29464:2017(E)
3.1.24
flow rate
air flow rate
volume of air flowing through the filter per unit time
3.1.25
nominal flow rate
nominal air flow rate
air flow rate specified by the manufacturer
3.1.26
air flow rate, test
test air flow rate
test flow
test flow rate
test volume flow rate
air flow rate used for testing
Note 1 to entry: The flow rate is usually expressed in volumetric units (m /s).

Note 2 to entry: Test flow rate may differ from the manufacturer’s rated flow through the air cleaner.

3.1.27
rated flow

flow rate through a test device, 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 (3.1.26).

3.1.28
gas

substance whose vapour pressure is greater than the ambient pressure (3.5.50) at ambient temperature

3.1.29
header frame

integral rigid frame of a filter enabling it to be fastened and sealed against the holding frame (3.1.30)

3.1.30
holding frame

rigid structural frame, part of an air handling system into which filters are fastened and sealed

3.1.31
housing
device used to hold filter
3.1.32
hood
inlet device for extraction system
3.1.33
leak
point in a filter at which the local penetration exceeds a given value
3.1.34
penetration
breakthrough

ratio of contaminant concentration downstream of the test device to the upstream (challenge)

concentration (3.1.7)
Note 1 to entry: Sometimes expressed as a percentage.

Note 2 to entry: Penetration is related to efficiency (E) by the expression: E = (1 – P) × 100 %.

4 © ISO 2017 – All rights reserved
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SIST EN ISO 29464:2019
ISO 29464:2017(E)

Note 3 to entry: Penetration is related to the decontamination factor (DF) (3.1.10) by the expression:

DF = 1/penetration.
3.1.35
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 (3.2.149)

and/or resistance to air flow.
3.1.36
resistance to air flow
differential pressure
pressure differential
pressure drop
difference in absolute (static) pressure between two points in a system
Note 1 to entry: Resistance to air flow is measured in Pa.
3.1.37
test air
air to be used for testing purposes
3.1.38
test device
filter element (3.2.77) being subjected to performance testing
3.1.39
upstream
area or region from which fluid flows as it enters the test device (3.1.38)
3.1.40
washer

dust separator (3.2.158), droplet separator (3.2.157) or gas purifier (3.5.38) that depends on a liquid

acting as a collecting medium for its operation
3.2 Particulate filters (including general ventilation, HEPA and ULPA filters)
3.2.1
aerosol
system of solid or liquid particles suspended in gas

Note 1 to entry: In general, one divides the atmospheric aerosol into three size categories: the ultrafine range

x < 0,1 µm, the fine range 0,1 µm ≤ x < 1 and the coarse range x ≥ 1 µm, whereby x is the particle diameter (3.2.124).

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 photometer

light-scattering airborne particle mass concentration (3.1.7) measuring apparatus, which uses a

forward-scattering-light optical chamber to make measurements
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ISO 29464:2017(E)
3.2.5
polydisperse aerosol

aerosol, the width of whose distribution function, described by the geometric standard deviation σg,

exceeds 1,5 µm
3.2.6
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
3.2.7
reference aerosol
defined approved aerosol for test measurement within a specific size range
3.2.8
solid phase aerosol
solid particles suspended in a gas
3.2.9
test aerosol

aerosol used for determining performance of the device being tested and for calibrating particle

measurement devices
3.2.10
agglomerate
collection of solid particles adhering to each other
3.2.11
agglomeration
action leading to the formation of agglomerates (3.2.10)
3.2.12
agglutination

action of joining, by impact (3.2.102), solid particles coated with a thin adhesive layer or of trapping

solid particles by impact on a surface coated with adhesive
3.2.13
aggregate

relatively stable assembly of dry particles, formed under the influence of physical forces

3.2.14
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 weight percentage.
3.2.15
average arrestance

ratio of the total amount of loading dust retained by the filter to the total amount of dust fed up to final

test pressure differential
3.2.16
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
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ISO 29464:2017(E)
3.2.17
gravimetric arrestance

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

under given operating conditions
Note 1 to entry: This measure is expressed as a weight percentage.
3.2.18
initial arrestance
value of arrestance determined after the first loading cycle in a filter test
Note 1 to entry: For example, in ISO 29461-1 or ISO 16890-3 procedure.
Note 2 to entry: This measure is expressed as a weight percentage.
3.2.19
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

loading cycle in a filter test
Note 1 to entry: This measure is expressed as a weight percentage.
3.2.20
ash
solid residue of effectively complete combustion
3.2.21
fly ash
ash entrained by combustion gases
3.2.22
bioaerosol

particles of biological origin with an aerodynamic diameter of up to 100 μm 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.
3.2.23
burst pressure

value of differential pressure across a filter, above which damage/destruction of the filter medium

(3.1.20) or the structure occurs
3.2.24
calibration particle

mono-disperse spherical particle with a known mean particle size, e.g. 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 %

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).
3.2.25
dust holding capacity
DHC

total weight of loading dust captured by the air-cleaning device up to the final pressure differential

3.2.26
test dust capacity
dust loading capacity
TDC

amount of a standard test dust held by the test device at the final test pressure differential

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ISO 29464:2017(E)
3.2.27
cleaning

removal of the deposit of solid or liquid particles which has produced clogging

3.2.28
clogging

deposition, progressive or otherwise, of solid or liquid particles on or within a filter medium (3.1.20),

causing the flow to be obstructed
3.2.29
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 (3.2.131) decreases, the particle mass concentration (3.1.7) remains the same and the particle size

(3.2.133) increases.
3.2.30
coalescence

action by which liquid particles in suspension (3.2.162) unite to form larger particles

3.2.31
coefficient of variation
standard deviation of a group of measurements divided by the mean
3.2.32
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 (3.1.7) which is too low and a

value for the particle diameter (3.2.124) which is too high.
3.2.33
correlation ratio

calculation of any potential bias between the upstream and downstream sampling systems

3.2.34
correlation ratio

downstream particle concentration divided by the upstream particle concentration

(measured without filter)
3.2.35
counting efficiency

expression of that proportion of the particles of detectable size suspended in the volume flow under

analysis that make their way through the measured volume and are counted by the particle counter

EXAMPLE The ratio of the concentration (3.1.7) measured to actual aerosol concentration.

Note 1 to entry: The counting efficiency depends on the particle size (3.2.133) and decreases progressively in the

proximity of the lower detection limit of the particle counter.
3.2.36
counting rate
number of counting events per unit time
3.2.37
cyclone

dust separator (3.2.158) or droplet separator (3.2.157) utilizing essentially the centrifugal force derived

from the motion of the gas
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3.2.38
DiEthylHexylSebacate
DEHS
liquid used for generating the DEHS test aerosol (3.2.9)
3.2.39
equivalent diameter

diameter of a spherical particle which will give behaviour equivalent to that of the particle being

examined
3.2.40
median diameter

diameter of the particle for which the cumulated volume fraction is equal to 50 % on a cumulated

volume particle size distribution curve
3.2.41
count median diameter of aerosol
number median diameter of aerosol
CMD
50th percentile of the number distribution of the 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.
3.2.42
final differential pressure

differential pressure up to which the filtration performance is measured for classification (3.1.6)

purposes
3.2.43
initial differential pressure

differential pressure of the clean filter operating at its test air flow rate (3.1.26)

3.2.44
mean differential pressure
arithmetical mean value of the measured number of differential pressures
3.2.45
recommended final differential pressure

maximum operating differential pressure of the filter as recommended by the manufacturer

3.2.46
diluter
dilution system

system for reducing the sampled concentration (3.1.7) to avoid coincidence error in the particle counter

3.2.47
dispersion

operation as a result of which solid particles or liquid particles are distributed in a fluid

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 (3.2.9).

3.2.48
D.O.P.
dispersed oil particulates
3.2.49
DOP
dioctyl phthalate
© ISO 2017 – All rights reserved 9
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SIST EN ISO 29464:2019
ISO 29464:2017(E)
3.2.50
droplet

liquid particle of small mass, capable of remaining in suspension (3.2.162) in a gas

Note 1 to entry: In some turbulent systems, for example clouds, its diameter can reach 200 μm.

3.2.51
dust
airborne solid particles which settle by gravity in calm conditions
3.2.52
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 (3.2.158).
3.2.53
dust feeder
device which is used to distribute test dust to the filter
3.2.54
loading dust
synthetic test dust

synthetic dust formulated specifically for determination of the test dust capacity and arrestance of air

filters (3.1.16)

Note 1 to entry: A number of loading dusts are currently in use. Some of them are defined in ISO 15957:2015.

3.2.55
collection efficiency

ratio of the quantity of particles retained by a separator (3.2.156) to the quantity entering it with regard

to filters (3.1.16), dust separators (3.2.158) and droplet separators (3.2.157)
Note 1 to entry: This measure is normally expressed as a percentage.
3.2.56
conditioned efficiency

efficiency of the conditioned filter medium operating at an average medium velocity corresponding to

the test air flow rate (3.1.26) in the filter

Note 1 to entry: The conditioning procedure varies depending on the standard being used.

3.2.57
counting efficiency

ratio, expressed as a percentage, of detected number concentration (3.1.7) of particles divided by the

actual number concentration of particles in a given size or range of sizes
3.2.58
dust loaded efficiency

efficiency of the filter operating at test flow rate and after dust loadings up to final test pressure

differential
3.2.59
fractional efficiency
ability of an air cleaning device to remove particles
...

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