Heating boilers - Test regulations for airborne noise emissions from heat generators - Part 1: Airborne noise emissions from heat generators

This European Standard specifies test methods for airborne noise emissions from heat generators in a test laboratory or at the place of installation.
The test methods described in this European Standard, however, may be used for measuring the airborne noise emissions of the appliances and functions listed below.
This European Standard applies to following appliances regardless of their heat output and the fuel used:
- wall-mounted and floor-standing heating appliances;
- forced-draught burners;
- boilers/forced-draught burner units;
- boilers with freely allocated forced-draught burners;
- pellet burners.
According to this European Standard the manufacturer is allowed to choose an appropriate category of testing for the measured appliance.
This European Standard does not apply to:
- appliances used exclusively for heating drinking-water;
- function of heating drinking-water in so-called combined water-heaters;
- heat generators which work with air as the heat transfer medium;
- electrical heating appliances;
- structure-borne noise;
- sound transmission along the flue gas path.

Heizkessel - Prüfverfahren für Luftschallemissionen von Wärmeerzeugern - Teil 1: Luftschallemissionen von Wärmeerzeugern

Diese Europäische Norm legt Verfahren für die Prüfung der Luftschallemissionen von Wärmeerzeugern in einem Prüflaboratorium oder am Einbauort fest.
Die in dieser Europäischen Norm beschriebenen Prüfverfahren dürfen jedoch auch für die Messung der Luftschallemissionen der unten aufgeführten Geräte und Funktionen angewendet werden.
Diese Europäische Norm gilt unabhängig von der Wärmeleistung und dem verwendeten Brennstoff für die folgenden Geräte:
-   wandhängende und bodenstehende Heizgeräte;
-   Gebläsebrenner;
-   Heizkessel mit Gebläsebrennern (Units);
-   Heizkessel mit frei zugeordneten Gebläsebrennern;
-   Pelletbrenner.
Entsprechend dieser Europäischen Norm darf der Hersteller eine geeignete Prüfklasse für das gemessene Gerät wählen.
Diese Europäische Norm gilt nicht für:
-   Geräte, die ausschließlich zur Erwärmung von Trinkwasser dienen;
-   die Funktion Trinkwassererwärmung in so genannten Kombiwasserheizern;
-   Wärmeerzeuger, die mit Luft als Wärmeträgermedium arbeiten;
-   elektrische Heizgeräte;
-   Körperschall;
-   Schallübertragung durch den Abgasweg.

Chaudieres de chauffage - Regles d´essais des émissions de bruit aérien des générateurs de chaleur - Partie 1 : Émissions du bruit aérien des générateurs de chaleur

La présente Norme européenne spécifie les méthodes d'essai pour les émissions de bruit aérien des générateurs de chaleur dans un laboratoire d'essai ou sur le lieu d'installation.
Toutefois, les méthodes d'essai décrites dans la présente Norme européenne peuvent être utilisées pour mesurer les émissions de bruit aérien des et les fonctions énumérées ci-dessous.
La présente Norme européenne s'applique aux appareils suivants, indépendamment de leur puissance utile et du combustible utilisé :
   chaudières murales et sol ;
   brûleurs à air soufflé ;
   chaudières/unités avec brûleur à air soufflé ;
   chaudières destinées à être équipées de brûleurs à air soufflé ;
   brûleurs à granulés.
Conformément à la présente Norme européenne, le fabricant est autorisé à choisir une catégorie d'essai appropriée pour l'appareil mesuré.
La présente Norme européenne ne s’applique pas :
   aux appareils utilisés exclusivement pour la production d’eau chaude sanitaire ;
   à la fonction production d’eau chaude sanitaire des appareils combinés ;
   aux générateurs de chaleur qui utilisent l'air comme fluide caloporteur ; (on les nomme aussi générateurs d’air chaud) ;
   aux appareils de chauffage électrique ;
   au bruit solidien ;
   à la transmission du son le long de la veine des gaz de combustion.

Kotli za gretje – Postopek preskušanja emisije hrupa po zraku iz generatorjev toplote – 1. del: Emisija hrupa po zraku iz generatorja toplote

General Information

Status
Published
Publication Date
31-Jan-2007
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Feb-2007
Due Date
01-Feb-2007
Completion Date
01-Feb-2007

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SLOVENSKI STANDARD
SIST EN 15036-1:2007
01-februar-2007
Kotli za gretje – Postopek preskušanja emisije hrupa po zraku iz generatorjev
toplote – 1. del: Emisija hrupa po zraku iz generatorja toplote

Heating boilers - Test regulations for airborne noise emissions from heat generators -

Part 1: Airborne noise emissions from heat generators
Heizkessel - Prüfverfahren für Luftschallemissionen von Wärmeerzeugern - Teil 1:
Luftschallemissionen von Wärmeerzeugern
Chaudieres de chauffage - Regles d´essais des émissions de bruit aérien des

générateurs de chaleur - Partie 1 : Émissions du bruit aérien des générateurs de chaleur

Ta slovenski standard je istoveten z: EN 15036-1:2006
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 15036-1:2007 en,fr,de

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

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SIST EN 15036-1:2007
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SIST EN 15036-1:2007
EUROPEAN STANDARD
EN 15036-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2006
ICS 17.140.20; 91.140.10
English Version
Heating boilers - Test regulations for airborne noise emissions
from heat generators - Part 1: Airborne noise emissions from
heat generators

Chaudières de chauffage - Règles d´essais des émissions Heizkessel - Prüfverfahren für Luftschallemissionen von

de bruit aérien des générateurs de chaleur - Partie 1 : Wärmeerzeugern - Teil 1: Luftschallemissionen von

Émissions du bruit aérien des générateurs de chaleur Wärmeerzeugern
This European Standard was approved by CEN on 14 August 2006.

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 Central Secretariat 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 Central Secretariat has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,

Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15036-1:2006: E

worldwide for CEN national Members.
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)
Contents Page

Foreword..............................................................................................................................................................4

Introduction .........................................................................................................................................................5

1 Scope ......................................................................................................................................................6

2 Normative references ............................................................................................................................6

3 Terms and definitions ...........................................................................................................................7

4 Determining sound power levels .........................................................................................................7

4.1 General data ...........................................................................................................................................7

4.2 Test method............................................................................................................................................8

4.2.1 Measurement approach ........................................................................................................................8

4.2.2 Uncertainty of test .................................................................................................................................8

4.2.3 Selection of test methods .....................................................................................................................9

4.2.4 Operation ..............................................................................................................................................11

5 Set up and operation of the appliances ............................................................................................11

5.1 General..................................................................................................................................................11

5.2 Equipment and preliminary treatment...............................................................................................11

5.3 Climatic conditions..............................................................................................................................11

5.4 Operation of the appliance .................................................................................................................11

6 Test report ............................................................................................................................................12

6.1 General..................................................................................................................................................12

6.2 Information and readings in the test report ......................................................................................12

6.2.1 General information in the report.......................................................................................................12

6.2.2 Information on measured data ...........................................................................................................13

Annex A (normative) Free field method.........................................................................................................14

A.1 General..................................................................................................................................................14

A.2 Principle................................................................................................................................................14

A.3 Test equipment ....................................................................................................................................17

A.4 Location and number of measurement points .................................................................................17

A.5 Determination of sound power level according to EN ISO 3744 and EN ISO 3746.......................20

A.5.1 Test procedure.....................................................................................................................................20

A.5.2 Calculation of sound pressure level averaged over the measurement surface ...........................21

A.5.3 Calculation of A-weighted sound pressure levels from frequency band data..............................21

A.5.4 Correction for background noise.......................................................................................................23

A.5.5 Correction for the test environment ..................................................................................................23

A.5.6 Calculation of the surface sound pressure level..............................................................................25

A.5.7 Calculation of the sound power level ................................................................................................25

Annex B (normative) Reverberant room method .........................................................................................26

B.1 General..................................................................................................................................................26

B.2 Principle................................................................................................................................................26

B.3 Test equipment ....................................................................................................................................26

B.4 Environment.........................................................................................................................................26

B.5 Sound pressure measurements.........................................................................................................26

B.6 Calculation of sound pressure level average ...................................................................................27

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SIST EN 15036-1:2007
EN 15036-1:2006 (E)

B.7 Background noise correction ............................................................................................................27

B.8 Calculation of the average sound power spectrum.........................................................................28

B.8.1 Comparative method...........................................................................................................................28

B.8.2 Direct method ......................................................................................................................................28

B.9 Determination of A-weighted sound power level.............................................................................29

Annex C (normative) Sound intensity method .............................................................................................30

C.1 General .................................................................................................................................................30

C.2 Principle ...............................................................................................................................................30

C.3 Test equipment....................................................................................................................................30

C.4 Measuring points and procedure.......................................................................................................31

C.4.1 General .................................................................................................................................................31

C.4.2 Test according to EN ISO 9614-1 (discrete points)..........................................................................31

C.4.3 Test according to EN ISO 9614-2 (scanning)....................................................................................32

C.5 Calculation of sound power levels ....................................................................................................33

Annex D (informative) Examples for free field method category 3 ............................................................34

Annex E (informative) Microphone positions...............................................................................................38

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SIST EN 15036-1:2007
EN 15036-1:2006 (E)
Foreword

This document (EN 15036-1:2006) has been prepared by Technical Committee CEN/TC 57 “Central heating

boilers”, the secretariat of which is held by DIN.

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 March 2007, and conflicting national standards shall be withdrawn at

the latest by March 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, Cyprus, Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,

Switzerland and United Kingdom.
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)
Introduction

Generally speaking, determining the airborne noise emissions is only part of a comprehensive testing

programme which takes into account many different viewpoints relating to the characteristics and behaviour in

using a heat generator. It is therefore important that the requirements for noise tests, such as the measuring

equipment and the environment in which it is used should always be considered within the prescribed context.

It is also important whatever the ultimate purpose may be, to lay down procedures within a defined degree of

accuracy, so that the measuring results obtained from various different laboratories can be compared with one

another. These conditions have been taken into account as far as possible in preparing these test methods.

All test procedures defined in EN ISO 3741, EN ISO 3743, EN ISO 3744, EN ISO 3746 and EN ISO 9614 are

permissible methods.

It should be emphasised that these test methods only apply to airborne noise. In many cases, however,

structure-borne noise, such as can be transmitted into a neighbouring room, can also be of significance. It is

envisaged that airborne noise emissions through the flue gas path will be dealt with in a separate part of this

standard.

All the basic and noise measurement standards of accuracy categories 1 to 3 are permissible under this

testing standard.

Sound values declared by the manufacturer can be measured according to these three categories, but in any

case, the used category has to be stated.

This European Standard sets out various methods for testing to approximate the airborne noise emitted by

heat generators into the room of installation.
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)
1 Scope

This European Standard specifies test methods for airborne noise emissions from heat generators in a test

laboratory or at the place of installation.

The test methods described in this European Standard, however, may be used for measuring the airborne

noise emissions of the appliances and functions listed below.

This European Standard applies to following appliances regardless of their heat output and the fuel used:

 wall-mounted and floor-standing heating appliances;
 forced-draught burners;
 boilers/forced-draught burner units;
 boilers with freely allocated forced-draught burners;
 pellet burners.

According to this European Standard the manufacturer is allowed to choose an appropriate category of testing

for the measured appliance.
This European Standard does not apply to:
 appliances used exclusively for heating drinking-water;
 function of heating drinking-water in so-called combined water-heaters;
 heat generators which work with air as the heat transfer medium;
 electrical heating appliances;
 structure-borne noise;
 sound transmission along the flue gas path.
2 Normative references

The following referenced documents are indispensable for the application 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.
EN 267, Forced draught oil burners — Definitions, requirements, testing, marking
EN 437, Test gases — Test pressures — Appliance categories
EN 676, Automatic forced draught burners for gaseous fuels

EN ISO 3741, Acoustics — Determination of sound power levels of noise sources using sound pressure —

Precision methods for reverberation rooms (ISO 3741:1999).
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)

EN ISO 3743-1:1995, Acoustics — Determination of sound power levels of noise sources – Engineering

methods for small, movable sources in reverberant fields — Part 1: Comparison method for hard-walled test

rooms (ISO 3743-1:1994)

EN ISO 3743-2:1996, Acoustics - Determination of sound power levels of noise sources using sound pressure

- Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special

reverberation test rooms (ISO 3743-2:1994)

EN ISO 3744:1995, Acoustics - Determination of sound power levels of noise sources using sound pressure -

Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994)

EN ISO 3745, Acoustics - Determination of sound power levels of noise sources using sound pressure -

Precision methods for anechoic and semi-anechoic rooms (ISO 3745:2003)

EN ISO 3746:1995, Acoustics - Determination of sound power levels of noise sources using sound pressure -

Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995)

EN ISO 9614-1:1995, Acoustics - Determination of sound power levels of noise sources using sound intensity

- Part 1: Measurements at discrete points (ISO 9614-1:1993)

EN ISO 9614-2:1996, Acoustics — Determination of the sound power levels of noise sources using sound

intensity — Part 2: Measurements by scanning (ISO 9614-2:1996)

EN ISO 9614-3:2002, Acoustics — Determination of the sound power levels of noise sources using sound

intensity — Part 3: Precision method for measurement by scanning (ISO 9614-3:2002)

3 Terms and definitions

For the purposes of this standard, the terms and definitions given in EN ISO 3743-1:1995,

EN ISO 3743-2:1996, EN ISO 3744:1995, EN ISO 3746:1995, EN ISO 9614-1:1995, EN ISO 9614-2:1996

and EN ISO 9614-3:2002 and the following apply.
3.1
heat generator
device suitable for the combustion of liquid, gaseous and solid fuels
4 Determining sound power levels
4.1 General data

The sound power W, of a noise source is the total sound energy radiated by that source per second,

expressed in Watts (W). The sound power W, is customarily related to a reference sound power W and

expressed as a sound power level L in decibels (dB) according to equation (1):
L = 10⋅ log
(1)
where
–12
W is the reference sound power level of 1 pW (= 10 W).
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)

The main criteria for determining the choice of sound power level for the purpose of labelling the noise

emission are:

a) sound power level shall provide an adequate description of the noise emission and is independent of

environmental factors;

b) it shall be possible to determine the sound power level to a defined degree of accuracy from relatively

simple acoustic tests which can be carried out under a large number of defined acoustic conditions.

These test methods describe the objective procedure for determining the sound power level of airborne noise,

L .
The following sound power levels can be determined:
 A-weighted sound power level L
WA;

 sound power level in octave bands, L Tests shall be carried out on a frequency band covering at

WOct.
least an octave band from 125 Hz to 4000 Hz;

 sound power level in third bands, L . Tests shall be carried out on a frequency band covering at least

WThird
third-octave bands from 100 Hz to 5000 Hz.

For practical use, L test-stand measurements are sufficient for calculating the A-weighted sound power

level.
4.2 Test method
4.2.1 Measurement approach
To determine sound power level, there are three basic procedures. These are:

 Conversion of sound pressure level measured into a reverberant field to sound power level. This

approach is described in EN ISO 3741 and EN ISO 3743-1 and EN ISO 3743-2.

 Conversion of sound pressure level measured into a free-field (or assimilated to a free-field) according to

EN ISO 3744, EN ISO 3745 and EN ISO 3746.

 Conversion of intensity field emitted around the appliance to sound power level. This approach is

described in EN ISO 9614-1, EN ISO 9614-2 and EN ISO 9614-3.
4.2.2 Uncertainty of test

Within each measurement approach in 4.2.1, different methods are described by specific standards in order to

reach different levels of accuracy on the final results. These accuracy levels are the following (from the best to

the worst accuracy):
 Category 1 describes the precision class;
 Category 2 describes the engineering class;
 Category 3 describes the survey class.

NOTE 1 For instance, using a free-field approach, the three relevant standards are EN ISO 3745 (Category 1),

EN ISO 3744 (Category 2) and EN ISO 3746 (Category 3). If the experimental approach is similar (measure of average

sound pressure level on a fictitious area including the appliance), test requirements are different depending on the

targeted level of accuracy (number of points, difference between background and appliance noise, test environment

correction, etc.).
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)

NOTE 2 Depending on the accuracy category, the available information is different. Survey methods do not provide

spectral data.

According to accuracy categories, standard deviations on A-weighted are provided in Table 1.

Table 1 - Standard deviations on A-weighted overall sound power level according to accuracy

categories of standards
Precision class Engineering class Survey class
1 1,5 4
Standard deviation σ dB
These standard deviations relate to a relatively flat spectrum.

In case of tonal noise, standard deviation of the survey method is increased by 1 dB.

In the hypothesis of a normal distribution of sound power level values, the probability that the correct value of

the sound power level of the appliance falls within a ±1,645 σ range, is 90 %. In addition, the probability that

the correct value of sound power level of the appliance falls within a ±1,96 σ range, is 95 %.

NOTE 3 Precision and engineering standards provide a spectral standard deviation, thus, it is possible to determine

relevant standard deviation on A-weighted overall level.
The manufacturer shall declare the category to be used.

It is recommended to use category 2, but if this is not possible, e.g. due to the back ground noise,

environmental conditions, size of the appliance etc., then category 3 applies.
4.2.3 Selection of test methods

Table 2 summarises the main requirements for categories available to determine sound power level.

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SIST EN 15036-1:2007
EN 15036-1:2006 (E)

Table 2 –Summary of test procedures and measurement environment for determining sound power levels

Sound pressure procedure
sound intensity procedure
EN ISO 3743-1 EN ISO 3743-2 EN ISO 3744 EN ISO 3746 EN ISO 9614-1 EN ISO 9614-2
Comparative
Direct procedure
procedure
Accuracy category 2 2 2 3 1, 2 or 3 2 or 3
In a mainly free
Room with Special No special test No special test No special test
Test environment sound field over a
reverberant walls reverberation room environment environment environment
reflecting plane
Measuring equipment
a) Microphone

b) Integrated sound level meter EN ISO 3743-1:1995 EN ISO 3743-2:1996 EN ISO 3744:1995 EN ISO 3746:1995 EN ISO 9614-1:1995 EN ISO 9614-2:1996

c) Band pass filter clause 5 clause 5 clause 5 clause 5 clause 6 clause 6

d) Calibrator a), b), c), d) ,f) a), b), c), d) a), b), c), d) a), b), c), d) d), e) d), e)

e) Sound intensity probe
f) Reference sound source
A-valued, A-weighted,
A-weighted,
Sound power level
A-weighted, A-weighted, in octaves, in octaves,
measurement which can be in octaves, A-weighted
in octaves in octaves in thirds, in third octaves,
obtained
in third octaves
band-limited band-limited

Tests according to according to according to according to according to according to

Annex B Annex B Annex A Annex A Annex C Annex C
See Table 1.
Not handled within this standard; only for information.
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)
4.2.4 Operation

According to the test facility and operator knowledge, tests will be carried out according to one of the following

annexes.
The use of each method according to category 2 is shortly described in:
 Annex A, free field method;
 Annex B, reverberant room method;
 Annex C, sound intensity method.
5 Set up and operation of the appliances
5.1 General

For measuring in a laboratory, the boiler shall be fixed to a wall/floor made of concrete or heavy masonry.

5.2 Equipment and preliminary treatment

Heat generators have to be equipped in the form in which they are delivered for the intended purpose or

function.

Front-mounted forced-draught burners can be measured at the test flame tube as well, in accordance with

EN 267 for forced-draught oil-fired burners or in accordance with EN 676 for forced-draught gas-fired burners

or on a boiler. Noise coming from the front of the test flame tube where the burner is installed is taken into

account.

It should be ensured that auxiliary equipment necessary for the operation of the heat generator or front-

mounted forced-draught burners does not emit any sound energy in the measuring environment which could

affect the results (see also Table A.1, “Limitation of background noise”).
5.3 Climatic conditions

The heat generators or front-mounted forced-draught burners shall be tested in a test laboratory under the

following climatic conditions (unless it has been designed specially for some other specific conditions):

 Temperature T: (20 ± 5) °C;
 Relative atmospheric humidity RH between 15 % and 70 %;
 Atmospheric pressure ps between 860 mbar and 1 060 mbar.

NOTE If measurements are to be taken on site, the ambient conditions should be stated in the report.

5.4 Operation of the appliance

The load and operating conditions of the equipment in static operation, in accordance with the manufacturer’s

installation and operating instructions, are decisive for determining its noise emissions.

The tests are taken at nominal output according to the relevant appliance standards and at the operating load

at which the greatest noise is emitted, as declared by the manufacturer. The start-up and shut-down

behaviour of the equipment and its operation for domestic hot-water, are ignored for these purposes.

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SIST EN 15036-1:2007
EN 15036-1:2006 (E)

The tests on gas-fired appliances are made if possible with test gas G20 according to EN 437. If not, the type

of gas used shall be indicated in the test report by identifying the relevant gas group.

The heat generator shall be used for its intended purpose and immediately prior to each series of readings. It

shall operate for a sufficient length of time until a steady state is reached. The same general requirements

apply to front-mounted forced-draught burners and inspections on the test flame tube.

For solid fuel appliances special operation conditions should be taken into account, e.g. fuel supply for the

storage tank to the appliance. There should be information on how often this operation will occur during

normal operation.
6 Test report
6.1 General

The information to be recorded includes all information which is required by the noise-test standards that are

being applied.

Any deviation from this standard and/or the noise-test standards being applied should be recorded in writing

and a justification stated for the deviations.
The test results should include the uncertainty level.
6.2 Information and readings in the test report
6.2.1 General information in the report
The report shall contain at least the following:

 reference to the standard under which the airborne noise emissions have been calculated;

 reference to the standard for the test procedure;
 type of equipment (wall-mounted, floor-standing, or burner);
 manufacturer, supplier, trade mark;
 trade designation of the appliance;
 manufacturer’s serial number;
 nominal rating data;
 additional equipment and accessories;
 fuel;
 test load;
 deviations from this and any other standards.
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)
6.2.2 Information on measured data

The following data shall be stated at adjustment conditions corresponding to the maximum heat output and

the maximum sound level, if applicable:
 A-weighted sound power level L
WA;
 accuracy category and standard deviation
The following measured data can also be stated;
 sound power levels in octave bands, L
WOct;
 noise in third-octave bands, L
WThird;

The reported values should include the maximum allowed deviation of the chosen category and the actual

standard deviation obtained:
 real standard deviation and category.
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SIST EN 15036-1:2007
EN 15036-1:2006 (E)
Annex A
(normative)
Free field method
A.1 General

An overview of the use of EN ISO 3744 (Accuracy: category 2) and EN ISO 3746 (Accuracy: category 3) is

provided hereafter. For more details, the operator will refer to the relevant standards. It is reminded that

testing shall be carried out according
...

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