CEN/TS 17153:2018

• Abstract:

  This document gives guidelines to correct the measured air flow rate when measuring conditions are different from standard conditions.; It applies to a power-law formula giving the air flow rate as a function of a pressure difference with an air flow rate coefficient, C, varying with temperature and pressure.; This document applies to:; - passive elements of air distribution systems with a cross-section area that does not depend on pressure;; - volume flow rate (and not mass flow rate).; This document is applicable to (but not limited to):; - EN 1507, Ventilation for buildings - Sheet metal air ducts with rectangular section - Requirements for strength and leakage;; - EN 1751, Ventilation for buildings - Air terminal devices - Aerodynamic testing of damper and valves;; - EN 12237, Ventilation for buildings - Ductwork - Strength and leakage of circular sheet metal ducts;; - EN 13141 1, Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 1: Externally and internally mounted air transfer devices;; - EN 13141 2, Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 2: Exhaust and supply air terminal devices;; - EN 13141 9, Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 9: externally mounted humidity controlled air transfer device;; - EN 13141 10, Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 10: humidity controlled extract air terminal device;; - EN 15727, Ventilation for buildings - Ducts and ductwork components, leakage classification and testing.; This document does not apply to:; - fans;; - air terminal devices with automatically controlled openings (variable openings).

• Status: Published
• Publication Date: 28-Aug-2018
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: CEN/TC 156 - Ventilation for buildings
• Drafting Committee: CEN/TC 156/WG 2 - Natural and mechanical powered residential ventilation
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 29-Aug-2018
• Due Date: 21-Nov-2018
• Completion Date: 29-Aug-2018
• Ref Project: SIST-TS CEN/TS 17153:2018 - Ventilation for buildings - Correction of air flow rate according to ambient conditions

• Refers: EN 12792:2003 - Ventilation for buildings - Symbols, terminology and graphical symbols
• Effective Date: 28-Jan-2026
• Referred By: EN 1751:2024 - Ventilation for buildings - Air terminal devices - Aerodynamic testing of damper and valves
• Effective Date: 28-Jan-2026

Overview

CEN/TS 17153:2018 provides clear guidelines to correct measured volume air flow rates when the measurement ambient conditions (temperature, pressure) differ from the reference (standard) conditions. The Technical Specification addresses flows described by a power‑law relationship between volume flow rate and pressure difference (q = C · Δp^n) where the flow coefficient C varies with air density and viscosity. It is intended for passive elements of air distribution systems (fixed cross‑section, volume flow) and excludes fans and devices with variable openings.

Key topics and requirements

• Scope and applicability
  • Applies to passive ductwork components and ventilation products tested in terms of volume flow rate, not mass flow.
  • Does not apply to fans or air terminal devices with automatically controlled (variable) openings.
• Power‑law formulation
  • Uses the power‑law q = C · Δp^n and explains how C changes with ambient temperature and pressure.
• Physical corrections
  • Air density is corrected using the ideal gas relation (pressure and temperature).
  • Dynamic viscosity is adjusted as a function of temperature.
  • Reference numeric values provided for common reference conditions (e.g., ρref = 1.204 kg/m3; µref ≈ 18.06×10−6 kg/(m·s); Tref = 293.15 K; pref = 101 325 Pa).
• Practical procedure
  • How to transpose the measured flow coefficient C from test conditions to reference conditions and then compute the corrected volume flow rate.
  • If measurements are in mass flow, convert to volume flow before correction.
• Flow exponent (n)
  • Recommends determining n by log‑log regression of Δp vs q.
  • Default values when measurement of n is not feasible:
    • n = 0.65 for duct leakage and many ventilation component leakage tests
    • n = 0.50 for dampers and most air transfer device tests
  • Warns that using a default n can introduce significant correction errors.

Applications

• Standardizes ambient correction for:
  • Ductwork leakage testing and classification
  • Aerodynamic testing of dampers and valves
  • Performance testing of residential air transfer devices and terminal devices
• Useful in test laboratories, product certification, HVAC quality assurance, and research where results must be reported at reference conditions for comparison or compliance.

Who should use this standard

• HVAC test laboratories and product manufacturers performing aerodynamic or leakage tests
• Certification bodies and compliance testers who need consistent, corrected flow data
• Standards committees and technical working groups updating related test standards

Related standards

• EN 1507, EN 12237, EN 1751, EN 13141‑1/2/9/10, EN 15727 - CEN/TS 17153 is intended to be used alongside these ventilation and ductwork test standards to ensure accurate, condition‑corrected flow reporting.

Keywords: CEN/TS 17153:2018, ventilation standard, air flow correction, ambient conditions, volume flow rate, power‑law, ductwork leakage, flow exponent, HVAC testing.

SLOVENSKI STANDARD
01-december-2018
3UH]UDþHYDQMHVWDYE.RUHNFLMDSUHWRND]UDNDJOHGHQDRNROMVNHSRJRMH
Ventilation for buildings - Correction of air flow rate according to ambient conditions
Lüftung von Gebäuden - Korrektur des Luftstroms entsprechend der
Umgebungsbedingungen
Ventilation des bâtiments - Correction du débit d'air en fonction des conditions ambiantes
Ta slovenski standard je istoveten z: CEN/TS 17153:2018
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17153
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
August 2018
TECHNISCHE SPEZIFIKATION
ICS 91.140.30
English Version
Ventilation for buildings - Correction of air flow rate
according to ambient conditions
Ventilation des bâtiments - Correction du débit d'air en Lüftung von Gebäuden - Korrektur des Luftstroms
fonction des conditions ambiantes entsprechend der Umgebungsbedingungen
This Technical Specification (CEN/TS) was approved by CEN on 6 December 2017 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17153:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols, abbreviations and subscripts . 6
5 Correction of air flow rate . 6
Bibliography . 9

European foreword
This document (CEN/TS 17153:2018) has been prepared by Technical Committee CEN/TC 156
“Ventilation for buildings”, the secretariat of which is held by BSI.
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.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Introduction
The formula to correct the air flow rate depending on ambient conditions that is stated in some
standards published by CEN/TC 156 is not correct. This document gives a correct formula and the way
it has been obtained. CEN/TC 156 working groups are invited to use the content of this document in
their standards. Those working groups can use the correct formula only or more depending on the level
of explanation needed for the understanding of their standards.
1 Scope
This document gives guidelines to correct the measured air flow rate when measuring conditions are
different from standard conditions.
It applies to a power-law formula giving the air flow rate as a function of a pressure difference with an
air flow rate coefficient, C, varying with temperature and pressure.
This document applies to:
— passive elements of air distribution systems with a cross-section area that does not depend on
pressure;
— volume flow rate (and not mass flow rate).
This document is applicable to (but not limited to):
— EN 1507, Ventilation for buildings — Sheet metal air ducts with rectangular section — Requirements
for strength and leakage;
— EN 1751, Ventilation for buildings — Air terminal devices — Aerodynamic testing of damper and
valves;
— EN 122
...