FprEN IEC 63086-2-2:2026

• Status: Not Published
• Publication Date: 12-Nov-2026
• ICS: 23.120 - Ventilators. Fans. Air-conditioners
• ICS: 97.080 - Cleaning appliances
• Technical Committee: CLC/TC 59X - Consumer information related to household electrical appliances
• Drafting Committee: IEC/TC 59 - IEC_TC_59
• Current Stage: 5060 - Voting results sent to TC, SR - Formal Approval
• Start Date: 31-Jul-2026
• Completion Date: 31-Jul-2026
• Ref Project: kSIST FprEN IEC 63086-2-2:2026 - Household and similar electrical air cleaning appliances - Method for measuring performance - Part 2-2: Particular requirements for determination of gas-phase pollutant reduction

FprEN IEC 63086-2-2:2026 is a CLC/IEC document for household and similar electrical air cleaning appliances that reduce gas-phase pollutants. It specifies laboratory test methods for measuring pollutant reduction and calculating the clean air delivery rate (CADR) for named test gases, so manufacturers, test laboratories and certifiers can compare products on a defined basis.

What does FprEN IEC 63086-2-2:2026 specify?

FprEN IEC 63086-2-2:2026 specifies test methods for electrically powered household and similar air cleaners intended to reduce gas-phase pollutants. It measures the reduction of specific gases in a test chamber and uses that result to calculate CADR.

The document focuses on gas-phase pollutant reduction, not on odour intensity. For odorous gases, a lower measured concentration does not automatically mean a lower odour level, so olfactory testing is outside this part.

The standard is organized into clauses 1 to 9 and Annexes A to G.

Annex	What it covers
Annex A	Test gases used in the procedure, including optional gases and alternative instruments
Annex B	Calculation of the 99% prediction interval of the regression line
Annex C	Test report information
Annex D	Background and initial concentration
Annex E	Normative limits of measurability
Annex F	Schematic representation of a CADR measurement
Annex G	Normative particular requirements for ozone reduction

What are the key requirements of FprEN IEC 63086-2-2:2026?

The core of FprEN IEC 63086-2-2:2026 is a controlled chamber test in which the concentration decay of a target gas is measured twice - once without the DUT and once with the DUT running in maximum performance operation mode. The CADR is then calculated from the chamber volume and the difference between those two decay rates.

Test gases and initial concentrations

FprEN IEC 63086-2-2:2026 defines six representative test gases: formaldehyde, toluene, n-heptane, d-limonene, ammonia and nitrogen dioxide. It also allows optional gases such as acetaldehyde, α-pinene, acetic acid, isovaleric acid, hydrogen sulfide, methyl mercaptan and indole.

This matters because performance depends on the gas chemistry. A product that removes one gas well may perform differently on another, so the test has to match the intended claim. The standard also allows different gases to be chosen for different applications, rather than requiring every gas in every test.

Measuring the gas concentration

FprEN IEC 63086-2-2:2026 ties each gas to a measurement method. Formaldehyde is measured with DNPH cartridges and HPLC under ISO 16000-3. Toluene, n-heptane and d-limonene are measured under ISO 16000-6 using thermal desorption tubes with GC/MS or GC/FID, with SIFT-MS allowed as an alternative.

Ammonia is measured with distilled water and IC or a chemiluminescence analyser, and nitrogen dioxide is measured with a chemiluminescence analyser. The document also allows alternative methods if they have equivalent or better accuracy, which helps laboratories use validated instruments they already have.

Preparing the chamber and generating test gas

FprEN IEC 63086-2-2:2026 requires the test chamber to follow the general chamber requirements of IEC 63086-1, with a wall-mounted recirculation fan in the range of 300 to 500 m³/h and a maximum airspeed of 15 m/s at the specified measurement point. The chamber must be cleaned to background levels before testing, and the background concentration for each gas and for TVOC must be below the values in Table 2.

The test gases may be generated by a gas cylinder method or a temperature-controlled vaporization method. That is important in practice because the generation method affects stability, repeatability and whether the target concentration can be held within the required range.

Running the natural decay and total decay tests

FprEN IEC 63086-2-2:2026 measures two curves. The natural decay test is run without the DUT in the chamber, while the total decay test is run with the DUT switched on in maximum performance operation mode. The standard requires the DUT to be placed and powered outside the chamber entry for switching on, so the chamber is not disturbed during the measurement.

The test sequence includes mixing for 10 minutes, then measuring concentration every 5 minutes up to 60 minutes, with at least six acceptable data points. For some gases and methods, the same natural decay result may be reused for up to one week. In practice, this means the lab needs stable chamber conditions, clean sampling lines and enough valid data points to support a regression calculation.

For the total decay test, the DUT is pre-treated before measurement. The document requires inspection for obvious damage, running-in according to the manufacturer instructions, and specific lamp burn-in and filter-handling provisions where applicable. This matters because performance can change during the first hours of operation, especially for units with replaceable filters or UV-C components.

Data acceptance and CADR calculation

FprEN IEC 63086-2-2:2026 rejects data points outside the 99% prediction interval of the regression line, and it also removes any point below 3% of the initial concentration together with all later points in that run. That means the lab must watch for outliers and stop using late data once the signal has dropped too low for reliable measurement.

The decay constant is derived from a log-linear regression of concentration over time. CADR is then calculated from the test chamber volume and the difference between the total and natural decay rates, and the result is reported with the name of the target pollutant, such as CADR (formaldehyde). Annex E sets measurability limits, including minimum and maximum CADR values for each gas, so very low or very high results can fall outside the valid measurement range.

Ozone reduction

FprEN IEC 63086-2-2:2026 also includes a normative Annex G for ozone. Ozone is tested separately because of its strong reactivity, with UV absorption spectrometry for concentration measurement and an ozone generator for initial concentration. If ozone is tested with other gases in a sequence, it must be tested first.

What terms does FprEN IEC 63086-2-2:2026 define?

• CADR - clean air delivery rate, the flow of clean air delivered by the DUT with respect to the target pollutant.
• DUT - device under test, the air cleaner being examined in the chamber.
• Natural decay rate - the concentration decrease in the chamber without the DUT, caused by adsorption, reactions and air exchange.
• Total decay rate - the concentration decrease with the DUT operating, combining natural decay and the DUT effect.
• Background concentration - the test gas concentration in the chamber after cleaning and before any test gas is added.
• Initial concentration - the concentration measured at the start of the decay measurement.
• TVOC - total volatile organic compounds, used here as a chamber-cleanliness indicator.
• Maximum performance operation mode - the manual setting with the highest flow rate and all air cleaning functions switched on and set to maximum, where applicable.

Who uses FprEN IEC 63086-2-2:2026?

FprEN IEC 63086-2-2:2026 is used by test laboratories that measure air cleaner performance for gas-phase pollutants. It is also used by manufacturers and product developers who need a repeatable method for comparing technologies such as adsorption, oxidation and filtration-based gas removal.

Quality managers and certification bodies use it to review test reports and check whether a claimed CADR value was measured under the same conditions as the standard. Buyers and technical evaluators can use it to understand what a gas-phase performance claim really covers, and which pollutant the CADR value refers to.

Which standards are used with FprEN IEC 63086-2-2:2026?

FprEN IEC 63086-2-2:2026 relies on IEC 63086-1:2020 for the general performance-testing framework, terminology and chamber requirements. It is paired with IEC 63086-2-1:2024, which covers particle reduction in the same series.

The document also uses ISO 16000-3 for formaldehyde sampling and analysis, ISO 16000-6 for VOC sampling and analysis, and ISO 16000-9 for chamber-cleaning practice. Annex G refers readers to ISO 13964:1998 for ozone measurement principle and calibration background.

What does the FprEN IEC 63086-2-2:2026 document contain?

FprEN IEC 63086-2-2:2026 contains the test gases and concentration targets, chamber preparation rules, gas generation methods, measurement methods, and the calculation procedure for decay rates and CADR. It also includes a regression-based method for identifying outliers and a formula-based approach for estimating variability.

The annexes add practical material that laboratories need when setting up and reporting the test. Annex C lists the information expected in a test report, Annex D explains background and initial concentration choices, Annex E sets measurability limits, Annex F gives a schematic of the measurement sequence, and Annex G adds a separate ozone test path.

SLOVENSKI STANDARD
oSIST prEN IEC 63086-2-2:2025
01-junij-2025
Gospodinjski in podobni električni aparati za čiščenje zraka - Metode za merjenje
učinkovitost delovanja - 2-2. del: Posebne zahteve za določanje zmanjšanja
onesnaževal v plinski fazi
Household and similar electrical air cleaning appliances - Method for measuring
performance - Part 2-2: Particular requirements for determination of gas-phase pollutant
reduction
Appareils d'épuration d'air électriques domestiques et appareils similaires - Méthodes de
mesure de l'aptitude à la fonction - Partie 2-2: Exigences particulières pour la
détermination de la réduction des polluants en phase gazeuse
Ta slovenski standard je istoveten z: prEN IEC 63086-2-2:2025
ICS:
23.120 Zračniki. Vetrniki. Klimatske Ventilators. Fans. Air-
naprave conditioners
97.030 Električni aparati za dom na Domestic electrical
splošno appliances in general
oSIST prEN IEC 63086-2-2:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 63086-2-2:2025
oSIST prEN IEC 63086-2-2:2025
59N/69/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63086-2-2 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-04-25 2025-07-18
SUPERSEDES DOCUMENTS:
59N/39/CD, 59N/67/CC
IEC SC 59N : ELECTRICAL AIR CLEANERS FOR HOUSEHOLD AND SIMILAR PURPOSES
SECRETARIAT: SECRETARY:
United States of America Mr Wayne Morris
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 34,TC 59
ASPECTS CONCERNED:
Environment
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Household and similar electrical air cleaning appliances - Method for measuring performance - Part
2-2: Particular requirements for determination of gas-phase pollutant reduction

PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
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oSIST prEN IEC 63086-2-2:2025
Link to Committee Draft for Vote (CDV) online document:
https://osd.iec.ch/#/iec/archive/199687b8-93e0-cca1-e063-1710000ae4a1/en/CCDV/1

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CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Terms defined in IEC 63086-1:2020. 10
3.3 Abbreviated terms . 12
4 Test gases and initial concentrations for testing . 12
4.1 General . 12
4.2 Representative test gases . 13
4.2.1 Formaldehyde . 13
4.2.2 Toluene . 13
4.2.3 n-Heptane . 13
4.2.4 d-Limonene . 14
4.2.5 Ammonia . 14
4.2.6 Nitrogen dioxide . 14
5 Measurement method for test gas concentration . 14
5.1 General . 14
5.2 Measurement and analysis method for formaldehyde . 14
5.3 Measurement and analysis method for toluene, n-heptane, and d-limonene
.................................................................................................................. 14
5.4 Measurement and analysis method for ammonia . 14
5.5 Measurement and analysis method for nitrogen dioxide . 14
6 Generation of initial gas concentrations . 15
6.1 General . 15
6.1.1 Gas cylinder method . 15
6.1.2 Temperature-controlled vaporization method . 15
7 Test chamber . 15
8 Measurement of the CADR in maximum performance operation mode . 15
8.1 General . 15
8.2 Natural decay test . 15
8.2.1 General . 15
8.2.2 Setting the sampling point . 15
8.2.3 Cleaning of the test chamber . 15
8.2.4 Test chamber conditions . 16
8.2.5 Test gas emission . 16
8.2.6 Measurement of the initial concentration . 16
8.2.7 Measurement of the natural decay rate . 16
8.2.8 Calculation of the natural decay rate . 17
8.2.9 Acceptability of the run . 17
8.3 Total decay test . 17
8.3.1 Pre-treatment and Placement of the DUT . 17
8.3.2 Setting the sampling point . 17

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8.3.3 Cleaning of the test chamber . 17
8.3.4 Test chamber conditions . 17
8.3.5 Test gas emission . 18
8.3.6 Measurement of the initial concentration . 18
8.3.7 Operation of the DUT . 18
8.3.8 Measurement of the total decay rate . 18
8.3.9 Calculation of the total decay rate . 18
8.3.10 Acceptability of the run . 18
8.4 Calculation of the clean air delivery rate . 18
9 Calculation Procedures . 18
9.1 Criteria for the acceptance of data points . 18
9.1.1 Outliers from the regression line . 18
9.1.2 Concentration below 3 % of the initial concentration . 18
9.2 Calculation of decay constants . 19
9.3 Sample standard deviation of the slope of the regression line . 19
9.4 Calculation of the clean air delivery rate . 20
9.5 Sample standard deviation of the clean air delivery rate . 20
Annex A (informative) Test gases used in this test procedure . 21
A.1 Representative test gases . 21
A.1.1 Formaldehyde . 21
A.1.2 Toluene . 21
A.1.3 n-Heptane . 21
A.1.4 d-Limonene . 21
A.1.5 Ammonia . 21
A.1.6 Nitrogen dioxide . 21
A.2 Optional gases . 22
A.2.1 Acetaldehyde . 22
A.2.2 α-Pinene . 22
A.2.3 Acetic acid . 22
A.2.4 Isovaleric acid . 22
A.2.5 Hydrogen sulphide . 22
A.2.6 Methyl mercaptan . 22
A.2.7 Indole . 23
A.3 Alternative instruments used for measurement of test gas reduction . 23
Annex B (informative) Calculation of the 99 % prediction interval of the regression line
.......................................................................................................................... 24
Annex C (informative) Test report information. 26
C.1 General . 26
C.2 General data . 26
C.3 Description of the DUT . 26
C.4 Test chamber . 26
C.5 Generation method of test gases . 26
C.6 Test gas measurement instrumentation . 26
C.7 Test conditions . 27
C.8 Test execution . 27
C.9 Results . 27
Annex D (informative) Background and initial concentration . 28

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D.1 Background concentration . 28
D.2 Initial concentration . 28
Annex E (normative) Limits of measurability . 29
E.1 General . 29
E.2 Maximum clean air delivery rate . 29
E.3 The sample standard deviation of the slope of the regression line . 30
E.4 Minimum clean air delivery rate . 30
E.5 Limit for the sample standard deviation of the slope of the regression line . 31
Annex F (informative) Schematic representation of a CADR measurement . 32
Annex G (normative) Paticular requirements for determination of ozone reduction . 33
G.1 Genaral . 33
G.2 Measurement method for test gas concentration . 33
G.3 Generation of initial gas concentrations . 33
G.4 Measurement of the CADR in maximum performance operation mode . 33
Bibliography . 34

Figure E.1 – Cases in which the CADR for formaldehyde at the maximum value . 29
Figure F.1 – Schematic representation of the CADR measurement in accordance with
Clause 8 . 32

Table 1 – Representative test gases . 13
Table 2 – Target of the background concentration of test gases . 16
Table 3 – Limits for the sample standard deviation of the slope of the regression line
for the natural decay. 17
Table 4 – Limits for the sample standard deviation of the slope of the regression line
for the total decay. 18
Table A.1 – Optional gases . 22
Table A.2 – Alternative instruments . 23
Table B.1 – Values of the Student t-distribution with df=n-2 degrees of freedom for
different numbers of pairs of data points n . 24
Table D.1 – Background concentration measurement results . 28
Table E.1 – Maximum CADR . 30
Table E.2 – Sample standard deviation of the slope of the regression line calculated
from actual test results . 30
Table E.3 – Minimum CADR measurable for the test gases . 30

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household and similar electrical air cleaning appliances - Method for
measuring performance - Part 2-2: Particular requirements for
determination of gas-phase pollutant reduction –

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC 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, IEC [had/had not] received notice of (a)
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may not represent the latest information, which may be obtained from the pat ent database available at
https://patents.iec.ch. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 63086-2-2 has been prepared by subcommittee 59N: Electrical air cleaners for household
and similar purposes, of IEC technical committee 59: Performance of household and similar
electrical appliances, in co-operation with ISO technical committee 142: Cleaning equipment
for air and other gases. It is an International Standard.
It is published as a double logo International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
XX/XX/FDIS XX/XX/RVD
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Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 63086 series, published under the general title Household and
similar electrical air cleaning appliances - Methods for measuring the performance, can be
found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
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INTRODUCTION
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent. IEC takes no
position concerning the evidence, validity, and scope of this patent right.
The holder of this patent right has assured IEC that s/he is willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world.
In this respect, the statement of the holder of this patent right is registered with IEC. Information
may be obtained from the patent database available at patents.iec.ch/.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those in the patent database. IEC shall not be held
responsible for identifying any or all such patent rights.

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Household and similar electrical air cleaning appliances - Method for
measuring performance - Part 2-2: Particular requirements for
determination of gas-phase pollutant reduction –

1 Scope
This part of IEC 63086 specifies test methods for measuring the performance of electrically
powered household and similar air cleaners intended for the reduction of gas-phase pollutants.
This document is intended for measuring the reduction of the concentration of specific gas-
phase pollutants. This does not necessarily correlate with the reduction of odour intensity in
the case of odorous gas-phase pollutants. Such a reduction can only be tested by olfactory
tests, which are not part of this document.
NOTE Test methods for the determination of possible gas-phase by-products are under consideration.
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.
IEC 63086-1:2020, Household and similar electrical air cleaning appliances - Methods for
measuring the performance - Part 1: General requirements
IEC 63086-2-1:2024, Household and similar electrical air cleaning appliances - Methods for
measuring the performance - Part 2-1: Particular requirements for determination of reduction
of particles
ISO 16000-3, Indoor air - Part 3: Determination of formaldehyde and other carbonyl compounds
in indoor air and test chamber air - Active sampling method
ISO 16000-6, Indoor air - Part 6: Determination of organic compounds (VVOC, VOC, SVOC) in
indoor and test chamber air by active sampling on sorbent tubes, thermal desorption and gas
chromatography using MS or MSFID
ISO 16000-9, Indoor air - Part 9: Determination of the emission of volatile organic compounds
from building products and furnishing - Emission test chamber method
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63086-1:2020 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
gas-phase pollutants
gaseous compounds that can be found in residential dwellings either from entrance from the
outside, from human activities in dwelling, or from materials brought into the home

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3.1.2
test gases
selected gas-phase pollutants for measuring the performance of air cleaners
3.1.3
natural decay rate
reduction rate of target test gas in the test chamber due to natural factors, surface adsorption,
chemical reaction, and air exchange
−1
Note 1 to entry: The unit is per hour (h ).
3.1.4
total decay rate
reduction rate of target test gas in the test chamber due to combined effect of the natural decay
rate and the operation decay rate
−1
Note 1 to entry: The unit is per hour (h ).
3.1.5
background concentration
concentration of test gases in the test chamber after the test chamber has undergone cleaning
and prior to any testing or addition of target test gases
3.1.6
initial concentration
concentration of test gases being measured inside the test chamber immediately at the start
time of sampling of either the natural decay or the total decay
3.1.7
TVOC
total volatile organic compounds
sum of the concentrations of identified and unidentified volatile organic compounds eluting
between and including n-hexane and n-hexadecane (in accordance with ISO 16000-9)
3.1.8
real-time measurement method
method to measure the concentration of target test gas with continuous sampling and
measurement by instrument such as Chemiluminescence analyser and so on.
3.1.9
non-real-time measurement method
method to measure the concentration of target test gas with non-continuous process of air
sampling by sampling device, desorption of chemicals and measurement by instrument such
as High Performance Liquid Chromatography (HPLC) and so on.
3.2 Terms defined in IEC 63086-1:2020
3.2.1
air cleaner
electrically powered household, or similar, appliance that employs one or multiple technologies
to reduce one or more types of indoor air pollutants
[SOURCE: IEC 63086-1:2020, 3.1]
3.2.2
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.
[SOURCE: IEC 63086-1:2020, 3.2]

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3.2.3
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.
[SOURCE: IEC 63086-1:2020, 3.3]
3.2.4
combination products
air cleaner that includes a secondary function besides air cleaning within the same housing,
such as humidifying, dehumidifying, heating, or air conditioning
[SOURCE: IEC 63086-1:2020, 3.4]
3.2.5
DUT
device under test
air cleaner undergoing examination
[SOURCE: IEC 63086-1:2020, 3.5]
3.2.6
test chamber
self-contained room with determined volume, shape, and dimensions, which is used to measure
the performance of the DUT
[SOURCE: IEC 63086-1:2020, 3.6]
3.2.7
target pollutant
specific air pollutant with defined components, including three main categories: particulate
matter, gaseous pollutants, and microorganisms
[SOURCE: IEC 63086-1:2020, 3.7]
3.2.8
operation decay rate
reduction rate of the target pollutant in the test chamber, due to operation of the DUT
−1
Note 1 to entry: Units are per hour (h ).
[SOURCE: IEC 63086-1:2020, 3.8]
3.2.9
CADR
clean air delivery rate
flow rate of clean air (with respect to the target pollutant) delivered by the DUT calculated as
the product of the measured operation decay rate and the associated test chamber volume
3 −1
Note 1 to entry: The unit is cubic metres per hour (m h ).
[SOURCE: IEC 63086-1:2020, 3.9]
3.2.10
automatic operation mode
setting of the DUT chosen by the user in which the performance is regulated by the air cleaner
without further user interaction
[SOURCE: IEC 63086-1:2020, 3.10]

oSIST prEN IEC 63086-2-2:2025
IEC 63086-2-2 ED1 © IEC 2025 – 12 – 59N/69/CDV

3.2.11
manual operation mode
setting of the DUT, chosen by the user, that is not influenced by further external operator
interaction, air quality sensor data, and/or timers throughout the duration of the test
[SOURCE: IEC 63086-1:2020, 3.11]
3.2.12
maximum performance operation mode
manual operation mode where the DUT is set to the highest flow rate with all air cleaning
functions switched on and set to maximum, where applicable
Note 1 to entry: If the DUT has zero flow rate, the CADR is measured with all air cleaning functions switched on
Note 2 to entry: "All air cleaning functions switched on" implies that the requirements for testing are that all
available filters, either for particle and gas filtration, or a combination of both, are inserted in the DUT for each type
of test described in the applicable parts of IEC 63086-2.
3.2.13
energy efficiency in maximum performance operation mode
volume of cleaned air provided by consumption of a certain amount of energy calculated by
dividing the CADR of the DUT by the electrical power input
3 −1 −1
Note 1 to entry: The unit is cubic metres per watt hour (m W h ).
3.3 Abbreviated terms
CADR clean air delivery rate
DNPH 2,4- dinitrophenylhidorazine
DUT device under test
FID flame ionization detector
GC gas chromatography
HPLC high performance liquid chromatography
IC ion chromatography
MS mass spectrometry
PTFE polytetrafluoroethylene
SIFT-MS selected ion flow tube mass spectrometry
TVOC total volatile organic compounds
4 Test gases and initial concentrations for testing
4.1 General
gas-phase pollutants are mainly classified into 6 groups as a) aldehydes, b) aromatic
hydrocarbons, c) aliphatic hydrocarbons, d) cyclic terpenes, e) inorganic odorant gases and f)
inorganic combustion gases. The test gases representing each group are described in Table 1
in accordance with factors considered comprehensively such as commonly observed as indoor
pollutants, suitability for standard test methods in terms of availability, stability, and relatively
low toxicity, and typical chemical substances of the group.
The CADR of an air cleaner generally depends on the test gases, and individual representative
test gases differ in appropriate initial concentration, generation method, and measurement
method of concentration. It is not mandatory to perform tests with all representative test gases,
but individual ones relevant for the specific application may be chosen. Also, other test gases
which are not described as representative test gases may be chosen for example see Annex
A.
The initial concentration of the test gases shall be determined within the range described in
each clause in accordance with the purpose of the test and the accuracy of the measuring
instrument.
oSIST prEN IEC 63086-2-2:2025
IEC 63086-2-2 ED1 © IEC 2025 – 13 – 59N/69/CDV

Multiple test gases may be dosed at the same time for parallel measurement of the CADR if
they do not react with each other or modify the performance of the technology tested regarding
the pollutant(s) tested (ex: lead to competitive adsorption). If gases that can react with each
other or if a gas can modify the performance of the technology regarding the gas tested after
are used in two consecutive tests, the filter of the DUT shall be changed between the
measurements if it is replaceable. Otherwise, the DUT shall be operated in the test chamber
while the test chamber air treatment unit is running until the background concentration is below
the values described in 8.2.3.
Table 1 – Representative test gases
Group of gas-phase pollutants Representative test gas
a) Aldehydes Formaldehyde
b) Aromatic hydrocarbons Toluene
c) Aliphatic hydrocarbons n-Heptane
d) Cyclic terpenes d-Limonene
e) Inorganic odorant gases Ammonia
f) Inorganic combustion gases Nitrogen dioxide
NOTE 1 Technical methods such as adsorption (physical or chemical) and decomposition (oxidation and so on)
are used for removal of gas-phase pollutants. gas-phase pollutants have different physical and chemical properties,
for example, polar or nonpolar, acidic or basic, vapor pressure, resistance to decomposition by oxidative substances,
and so on. air cleaner performance for removal of each target gas-phase pollutants differs by the combination of
substance and technical method of removal. The performance for removal of one kind of gas -phase pollutants shall
not be applied to the other gas-phase pollutant. Therefore, it is important that certification and appeal and
explanation to consumers is based on the performance for multiple gas-phase pollutants in accordance with
purposes.
NOTE 2 For example, toluene, n-hexane and d-limonene can be tested in parallel, but formaldehyde shall not be
tested along with ammonia as they may react with each other.
NOTE 3 Testing individual test gases. The laboratory may select to test each gas individually. If this method is
chosen, the laboratory should choose a test sequence that avoid changing the performance of the technology tested
from one test to another. An example of sequence that can be applied for adsorption technology is: (cleaning) →
Toluene → (cleaning) → d-Limonene → (cleaning) → n-Heptane → (cleaning) → Ammonia → (cleaning) →
Formaldehyde → (cleaning) → Nitrogen dioxide → (cleaning). Testing in combination. If the laboratory has the
measurement instruments that are capable of measuring and delineating quantities of Toluene, d -Limonene, and n-
Heptane from each other, the laboratory may elect to test these three chemicals at the same time. In this case an
example of sequence for adsorption technology would be:(cleaning) → [combination of Toluene, d-Limonene and n-
Heptane] → (cleaning) → Ammonia → (cleaning) → Formaldehyde → (cleaning) → Nitrogen dioxide → (cleaning).
NOTE 4 The information of optional gases such as acetaldehyde and so on is described in Annex A.
4.2 Representative test gases
4.2.1 Formaldehyde
Use commercial gas mixed with nitrogen (N ) for gas cylinder method, an aquous solution of
formaldehyde (formalin, CAS 50-00-0, methanol free) or solid paraformaldehyde (CAS 30525-
89-4) for temperature-controlled vaporization method. initial concentration of formaldehyde is
−3
400 µg m (+20%)
4.2.2 Toluene
Use commercial gas mixed with nitrogen (N ) for gas cylinder method, or liquid-phase toluene
(CAS 108-88-3) with at least 99,9 % GC grade purity for temperature-controlled vaporization
−3
method. initial concentration of toluene is 800 µg m (+20 %)
4.2.3 n-Heptane
Use commercial gas mixed with nitrogen (N ) for gas cylinder method, or liquid-phase n-
heptane (CAS 142-82-5) with at least 99,0 % GC grade purity for temperature-controlled
−3
vaporization method. initial concentration of n-heptane is 800 µg m (+20 %).

oSIST prEN IEC 63086-2-2:2025
IEC 63086-2-2 ED1 © IEC 2025 – 14 – 59N/69/CDV

4.2.4 d-Limonene
Use commercial gas mixed with nitrogen (N ) for gas cylinder method, or liquid-phase d-
limonene (CAS 5989-27-5) with at least 95 % purify for temperature-controlled vaporization
−3
method. initial concentration of d-limonene is 800 µg m (+20 %)
4.2.5 Ammonia
Use commercial gas mixed with nitrogen (N ) for gas cylinder method, or aqueous ammonia
solution for temperature-controlled vaporization method. initial concentration of ammonia is
−3
700 µg m (+20 %).
NOTE It should be recognized that the odour may still be present although the concentration of odorants such as
ammonia is reduced.
4.2.6 Nitrogen dioxide
Use commercial gas mixed with nitrogen (N ) for gas cylinder method. initial concentration of
−3
nitrogen dioxide is 500 µg m (+20 %).
The presence of and concentration of nitric oxide and nitrogen dioxide are inextricably linked.
Therefore, the concentration of both nitric oxide and nitrogen dioxide throughout the test should
be monitored and reported as the concentration and CADR for both gases where found. The
natural decay rate and total decay rate tests shall be conducted with nitrogen dioxide
exclusively in the chamber.
5 Measurement method for test gas concentration
5.1 General
The measurement method for each substance is specified as follows. In case that it is confirmed
that an alternative method has same or higher accuracy than the specified method, it may be
used. The information of alternative methods is described in Annex A.
Maintenance of all measurements instruments shall be done as defined by the manufacturer´s
instructions. Calibration of the instruments with gas standards shall be regularly performed in
accordance with the standard operating procedures of the laboratory.
5.2 Measurement and analysis method for formaldehyde
According to ISO 16000-3, silica gel coated with 2,4-dinitrophenylhidorazine (DNPH 3.3)
cartridges and High Performance Liquid Chromatography (HPLC 3.3) shall be used for the
measurement and analysis of formaldehyde. In tests where there is a possibility that oxidative
substances such as ozone are generated, the ozone scrubber described in 5.2 of ISO16000-3
shall be installed in front of the DNPH 3.3 cartridge.
5.3 Measurement and analysis method for toluene, n-heptane, and d-limonene
According to ISO 16000-6, thermal desorption tubes and either Gas Chromatography / Mass
Spectrometry (GC/MS 3.3) or Gas Chromatography / Flame Ionization Detector (GC/FID 3.3)
shall be used for the measurement and analysis of toluene, n-heptane and d-limonene.
Selected Ion Flow Tube Mass Spectrometry (SIFT-MS 3.3) may be used instead of GC/MS
3.3or GC/FID 3.3.
5.4 Measurement and analysis method for ammonia
Distilled water and Ion Chromatography (IC 3.3) or Chemiluminescence analyser shall be used
for the measurement and analysis of ammonia.
5.5 Measurement and analysis method for nitrogen dioxide
Chemiluminescence analyser shall be used for the measurement and analysis of nitrogen
dioxide.
oSIST prEN IEC 63086-2-2:2025
IEC 63086-2-2 ED1 © IEC 2025 – 15 – 59N/69/CDV

6 Generation of initial gas concentrations
6.1 General
Each test gases is supplied into the test chamber by the gas cylinder method or the
temperature-controlled vaporization method and adjusted to the initial concentration shown in
4.2.
6.1.1 Gas cylinder method
The test gases in the cylinder, which has been adjusted to a predetermined concentration in
advance by nitrogen balance, is supplied into the test chamber through an appropriate regulator
and polytetrafluoroethylene (PTFE 3.3) or stainless-steel tube.
6.1.2 Temperature-controlled vaporization method
The high-purity reagent of the test gases in the permeation tube, the diffusion tube or the other
injection system is temperature-controlled and vaporized, and filtered air or nitrogen gas is
used as a carrier gas to supply the test gases into the test chamber.
7 Test chamber
The test chamber is in accordance with 5.6 of IEC 63086-1 except for the following changes:
3 −1
The wall-mounted recirculation fan shall have a flow rate of between 300 − 500 m h and a
−1
maximum airspeed of 15 m s measured at the centre of the fan exhaust at 0.5 m from the
face.
8 Measurement of the CADR in maximum performance operation mode
8.1 General
Perform the test procedure prescribed in 8.2 (natural decay rate) and 8.3 (total decay rate) to
determine the CADR of the DUT.
8.2 Natural decay test
8.2.1 General
natural decay rate shall be carried out without placement of the DUT to keep it away the
influence of the contamination by the gas-phase pollutants.
It is permissible to apply the results of the natural decay rate within one week instead of results
of a new test.
8.2.2 Setting the sampling point
Set the sampling point in accordance with 5.6.2 of IEC 63086-1. The sampling point shall be
connected to the DNPH cartridge, the thermal desorption tube or the instrument for the real-
time measurement method outside the test chamber with PTFE or stainless-steel tube.
NOTE In the case of non-real-time measurement method, the following method is shown as an example to keep
away the affection of adsorption or desorption from tube by minimizing the length of tube between the sampling point
and the sampling device. A tube is attached from the sampling pump to a sampling device such as a DNPH cartridge,
a thermal desorption tube and so on outside the test chamber. When inserting the sampling device from outside the
test chamber, adjust it by attaching it to a rod, etc. so that the tip of the sampling device is at the sampling point.
The sampling device is inserted into the chamber from outside the test chamber through the rod and so on only
when measurements are being made.
8.2.3 Cleaning of the test chamber
Start operating the mixing fan and recirculation fan. The recirculation fan will continue to
operate for the duration of the cleaning procedure. Using the filtration part of the test chamber
air treatment unit, allow the test chamber air to clean until the background concentration of
each test gases and TVOC reach a level below the values indicated in Table 2.When the
background concentration does not reach a level below the target due to the contamination on
inner surfaces of the test chamber, cleaning may be done by washing the inner surfaces of
thetest chamber with an alkaline detergent followed by
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