ASTM_E_1258_-_88_2012.pdf

Designation:E125888(Reapproved 2012)Standard Test Method forAirflow Calibration of Fan Pressurization Devices1This standard is issued under the fixed designation E1258;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the airflow measurement cali-bration techniques for fan pressurization systems used formeasuring air leakage rates through building envelopes.1.2 This test method is applicable to systems used for airleakage measurement as described in Practice E779.1.3 This test method involves the installation of the fanpressurization system in a calibration chamber.Use of the fanpressurization system in an actual building may introduceadditional errors in the airflow measurement due to operatorinfluence,interference of internal partitions and furnishings,weather effects,and other factors.1.4 The proper use of this test method requires a knowledgeof the principles of airflow and pressure measurement.1.5 This standard includes two basic procedures,a preferredprocedure,based on ASHRAE 51/AMCA 210,and an optionalprocedure based on a nonstandard airflow measurementtechnique,commonly used by manufacturers of fan pressur-ization devices,but which has not been compared withstandard airflow measurement techniques.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E631 Terminology of Building ConstructionsE779 Test Method for DeterminingAir Leakage Rate by FanPressurization2.2 American Society of Heating,Refrigerating,and Air-Conditioning Engineers Standard:3ASHRAE 51/AMCA 210 Laboratory Methods for TestingFans for Rating2.3 American Society of Mechanical Engineers Standard:4ASME MFC-3M Standard Measurement of Fluid Flow inPipes Using Orifice,Nozzle,and Venturi3.Terminology3.1 DefinitionsFor definitions used in this test method,see Terminology E631.3.2 Definitions of Terms Specific to This Standard:3.2.1 ambient conditions,nconditions in the space fromwhich air is drawn into the calibration chamber and into whichthe chamber air is expelled.3.2.2 chamber,nan enclosure of rectangular or circularcross section to simulate the entrance and exit conditions thatthe fan is expected to encounter in service.3.2.3 fan air density,ndensity of air at the fan inletexpressed in kilograms per cubic metre.3.2.4 fan airflow rate,nvolumetric airflow rate at the fanair density expressed in cubic metres per second.3.2.5 fan outlet area,ngross inside area measured in theplane of the fan outlet opening expressed in square metres.3.2.6 fan pressure difference,nthe static pressure differ-ence between two stations expressed in pascals,measuredusing the static pressure taps described in Fig.1.One station islocated within the chamber between the fan and the nearestflow conditioners.The other station is outside the chamber.3.2.7 fan pressurization system,na device for measuringthe air leakage rate of a building envelope under controlledpressurization or depressurization of the building interior.Thesystem includes controllable air-moving equipment,an airflowrate measuring system,and a device for measuring the pressure1This test method is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.41on Air Leakage and Ventilation Performance.Current edition approved Oct.1,2012.Published October 2012.Originallyapproved in 1988.Last previous edition approved in 2008 as E1258 88(2008).DOI:10.1520/E1258-88R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Heating,Refrigerating,and Air-Conditioning Engineers,Inc.(ASHRAE),1791 Tullie Circle,NE,Atlanta,GA30329,http:/www.ashrae.org.4Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 difference across the building envelope.Such a system is oftenreferred to as a blower door.3.2.8 fan signal,nan output from a fan pressurizationsystem(other than fan speed)that is related to fan airflow rateby the system calibration,such as the static pressure differenceacross