SIST EN 16211:2025

Ventilation for buildings - Measurement of air flow rates on site - Methods

This document specifies methods for the measurement of air flow rates on site. It provides a description of the air flow rate measurement methods and how measurements are performed within the margins of stipulated method uncertainties. It gives the necessary measurement conditions (e.g. length of straight duct, uniform velocity profile) to achieve the stipulated measurement uncertainties.
The methods for measuring the air flow rate inside ducts do not apply to:
-   ducts that are not circular or rectangular (e.g. oblong ducts);
-   flexible ducts.

Lüftung von Gebäuden - Luftvolumenstrommessung vor Ort - Verfahren

Dieses Dokument legt Verfahren für die Messung von Luftvolumenströmen vor Ort fest. Es enthält eine Beschreibung der Verfahren für die Messung von Luftvolumenströmen und wie Messungen innerhalb der für das Verfahren vorgeschriebenen Toleranzen durchgeführt werden. Es enthält die notwendigen Messbedingungen (z. B. Länge der geraden Luftleitung, gleichmäßiges Geschwindigkeitsprofil) zur Erreichung der vorgegebenen Messunsicherheiten.
Die Verfahren zur Messung des Luftvolumenstroms in Luftleitungen sind nicht anwendbar für:
   Luftleitungen, die nicht kreisförmig oder rechteckig sind (z B. längliche Luftleitungen);
   flexible Luftleitungen.

Ventilation des bâtiments - Mesurages des débits d'air sur site - Méthodes

Le présent document spécifie des méthodes pour le mesurage des débits d’air sur site. Il fournit une description des méthodes de mesurage de débit d’air et indique la façon dont les mesurages sont réalisés dans les marges d’incertitude de la méthode stipulée. Il donne les conditions de mesure nécessaires (par exemple, longueur de conduit droit, profil de vitesse uniforme) pour atteindre les incertitudes de mesure stipulées.
Les méthodes de mesure du débit d’air dans les conduits ne s’appliquent pas:
-   aux conduits qui ne sont pas circulaires ou rectangulaires (par exemple, conduits oblongs);
-   aux conduits flexibles.

Prezračevanje stavb - Meritve pretoka zraka v sistemu prezračevanja - Metode

General Information

• Status: Published
• Public Enquiry End Date: 31-May-2023
• Publication Date: 25-Nov-2024
• ICS: 17.120.10 - Flow in closed conduits
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: OGS - Heating for buildings
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 21-Nov-2024
• Due Date: 26-Jan-2025
• Completion Date: 26-Nov-2024
• Ref Project: EN 16211:2024 - Ventilation for buildings - Measurement of air flow rates on site - Methods

Relations

• Replaces: SIST EN 16211:2015 - Ventilation for buildings - Measurement of air flows on site - Methods
• Effective Date: 02-Sep-2020

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2025
Nadomešča:
SIST EN 16211:2015
Prezračevanje stavb - Meritve pretoka zraka v sistemu prezračevanja - Metode
Ventilation for buildings - Measurement of air flow rates on site - Methods
Lüftung von Gebäuden - Luftvolumenstrommessung vor Ort - Verfahren
Ventilation des bâtiments - Mesurages des débits d'air sur site - Méthodes
Ta slovenski standard je istoveten z: EN 16211:2024
ICS:
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 16211
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2024
EUROPÄISCHE NORM
ICS 17.120.10; 91.140.30 Supersedes EN 16211:2015
English Version
Ventilation for buildings - Measurement of air flow rates
on site - Methods
Ventilation des bâtiments - Mesurages des débits d'air Lüftung von Gebäuden - Luftvolumenstrommessung in
sur site - Méthodes Lüftungssystemen - Verfahren
This European Standard was approved by CEN on 30 September 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16211:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviated terms . 7
5 Expression of air flow rate and parameters of influence . 10
5.1 Hydraulic diameter . 10
5.2 Flow disturbances . 11
5.3 Stability of the air flow rate . 11
5.4 Air density . 11
5.5 Conversion of dynamic pressure into air velocity . 11
5.6 Correction and conversion of measured air flow rate . 12
5.6.1 General . 12
5.6.2 Correction of the air flow rate . 12
5.6.3 Conversion of the air flow rate . 13
6 Measuring instruments requirements . 14
6.1 General . 14
6.2 Air flow rate measuring instruments . 14
6.3 Differential pressure measuring instruments (manometers) . 14
6.4 Air velocity measuring instruments . 14
6.4.1 General . 14
6.4.2 Anemometers . 14
6.4.3 Pitot static tubes . 14
6.5 Temperature measuring instruments (thermometers) . 15
6.6 Atmospheric pressure measuring instruments (barometers) . 15
7 Methods for measurement of air flow rates . 16
7.1 Overview of described methods . 16
7.2 Multi‐point measurement in the duct cross‐section – with measurement plane
criteria (ID1) . 17
7.2.1 Principle . 17
7.2.2 Apparatus . 17
7.2.3 Measurement procedure . 18
7.2.4 Expression of results . 23
7.3 Multipoint measurement in the duct cross‐section – without measurement plane
criteria (ID2) . 25
7.3.1 Principle . 25
7.3.2 Apparatus . 25
7.3.3 Measurement procedure . 26
7.3.4 Expression of results . 32
7.4 Fixed devices for air flow rate measurement (ID3, ST1 and ET1) . 37
7.4.1 Principle . 37
7.4.2 Apparatus . 38
7.4.3 Measurement procedure . 38
7.4.4 Expression of results . 38
7.5 Air flow rate measurement with tight bag at supply ATDs (ST2) . 39
7.5.1 Principle . 39
7.5.2 Apparatus . 40
7.5.3 Measurement procedure . 40
7.5.4 Expression of results . 40
7.6 Air flow rate measurement with flow hood (ST3 and ET2) . 40
7.6.1 Principle . 40
7.6.2 Apparatus . 41
7.6.3 Measurement procedure . 43
7.6.4 Expression of results . 44
Annex A (informative) Additional methods . 45
A.1 Tracer gas measurement (ID4) . 45
A.1.1 Principle . 45
A.1.2 Apparatus . 45
A.1.3 Measurement procedure – Conditions for homogeneous mixing of tracer gas . 46
A.1.4 Expression of result – Calculation of air flow rate . 47
A.2 Measurement using anemometer at air intake (IN1) or air exhaust (EX1) . 48
A.2.1 Principle . 48
A.2.2 Apparatus . 48
A.2.3 Measurement procedure . 48
A.2.4 Expression of results . 49
A.3 Point measurements using thermal anemometers on rectangular intake (IN2) and
extract (ET3) grilles on walls . 49
A.3.1 Principle . 49
A.3.2 Measurement instruments/Apparatus . 50
A.3.3 Measurement procedure . 50
A.3.4 Standard measurement uncertainty . 52
Annex B (informative) Measurement uncertainty . 53
B.1 Uncertainty of the result of a measurement . 53
B.2 Type B evaluation of standard uncertainty . 53
B.3 Combined standard uncertainty . 55
B.4 Expanded uncertainty . 55
B.5 Examples . 56
Bibliography . 61

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