ISO INTERNATIONAL STANDARD 9972 Third edition 2015-08-15 Thermal performance of buildings Determination of air permeability of buildings Fan pressurization method Performance thermique des batiments Détermination de la perméabilite a I'air des batiments - Methode de pressurisation par ventilateur Reference number IS0 9972:2015(E) ISO International Organization for Standardization eeZhejang Institute of Standardization 5956617 @IS02015 ed without license from IHS IS0 9972:2015(E) COPYRIGHT PROTECTED DOCUMENT IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 · CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Internatinir DrganizationforStandardization Not for Resale, 2015/11/11 08:34:20 networking permited withoutlicense from IHS IS0 9972:2015(E) Contents Page Foreword ..V Introduction.. ..vi 1 Scope. 2 Normative references 3 Terms, definitions, and symbols 3.1 Terms and definitions ..1 3.2 Symbols... 4 Apparatus. ..4 4.1 General .4 4.2 Eguipment 4.2.1 Air-moving equipment 4 4.2.2 Pressure-measuring device ..4 4.2.3 Air flow rate measuring system ..4 4.2.4 Temperature-measuring device .4 5 Measurement procedure. ..4 5.1 Measurement conditions. .4 5.1.1 General .4 5.1.2 Measured extent. .5 5.1.3 Time of measurement 5 5.2 Preparation .5 5.2.1 Building preparation methods 5 5.2.2 Heating, ventilation and air conditioning systems and other building equipment 5 5.2.3 Intentional openings in the envelope 6 5.2.4 Openings inside the measured extent 5.2.5 Air-moving equipment 7 5.2.6 Pressure measuring devices. .7 5.3 Steps of the procedure. .8 5.3.1 Preliminary check .8 5.3.2 Temperature and wind conditions .8 5.3.3 Zero-flow pressure difference. .8 5.3.4 Pressure difference sequence.. ..8 6 Expression of results .9 6.1 Reference values .9 6.1.1 Internal volume. 6.1.2 Envelope area. 9 6.1.3 Net floor area 10 6.2 Calculation of the air leakage rate .10 6.3 Derived quantities.. ..13 6.3.1 General. ..13 6.3.2 Air change rate at reference pressure difference .13 6.3.3 Specific leakage rate (envelope) .. 13 6.3.4 Specific leakage rate (floor). .14 6.3.5 Effective leakage area. ..14 6.3.6 Specific effective leakage area (envelope) ..14 6.3.7 Specific effective leakage area (floor) 7 Test report ..15 8 Uncertainty ..15 8.1 General ..15 8.2 Reference value ..16 8.3 Overall uncertainty. ..16 Annex A (informative) Description of equipment used to pressurize buildings ..17 ntemaional ganzation5-All rights reserved iii LicenseeZhejang Institute of Standardization 5956617 ed without license from IHS Not for Resale, 2015/11/11 08:34:20