ASTM E1258-88(2003)
(Test Method)Standard Test Method for Airflow Calibration of Fan Pressurization Devices
Standard Test Method for Airflow Calibration of Fan Pressurization Devices
SCOPE
1.1 This test method covers the airflow measurement calibration techniques for fan pressurization systems used for measuring air leakage rates through building envelopes.
1.2 This test method is applicable to systems used for air leakage measurement as described in Practice E779.
1.3 This test method involves the installation of the fan pressurization system in a calibration chamber. Use of the fan pressurization system in an actual building may introduce additional errors in the airflow measurement due to operator influence, interference of internal partitions and furnishings, weather effects, and other factors.
1.4 The proper use of this test method requires a knowledge of the principles of airflow and pressure measurement.
1.5 This standard includes two basic procedures, a preferred procedure, based on ASHRAE Standard 51/AMCA Standard 210, and an optional procedure based on a nonstandard airflow measurement technique, commonly used by manufacturers of fan pressurization devices, but which has not been compared with standard airflow measurement techniques.
1.6 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E 1258 – 88 (Reapproved 2003)
Standard Test Method for
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Airflow Calibration of Fan Pressurization Devices
This standard is issued under the fixed designation E 1258; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope ASHRAE 51/AMCA 210 Laboratory Methods for Testing
Fans for Rating
1.1 This test method covers the airflow measurement cali-
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2.3 American Society of Mechanical Engineers Standard:
bration techniques for fan pressurization systems used for
ASME MFC-3M Standard Measurement of Fluid Flow in
measuring air leakage rates through building envelopes.
Pipes Using Orifice, Nozzle, and Venturi
1.2 This test method is applicable to systems used for air
leakage measurement as described in Practice E779.
3. Terminology
1.3 This test method involves the installation of the fan
3.1 Definitions—For definitions used in this test method,
pressurization system in a calibration chamber. Use of the fan
see Terminology E631.
pressurization system in an actual building may introduce
3.2 Descriptions of Terms Specific to This Standard:
additional errors in the airflow measurement due to operator
3.2.1 ambient conditions, n—conditions in the space from
influence, interference of internal partitions and furnishings,
which air is drawn into the calibration chamber and into which
weather effects, and other factors.
the chamber air is expelled.
1.4 Theproperuseofthistestmethodrequiresaknowledge
3.2.2 chamber, n—an enclosure of rectangular or circular
of the principles of airflow and pressure measurement.
cross section to simulate the entrance and exit conditions that
1.5 Thisstandardincludestwobasicprocedures,apreferred
the fan is expected to encounter in service.
procedure, based on ASHRAE Standard 51/AMCA Standard
3.2.3 fan air density, n—density of air at the fan inlet
210, and an optional procedure based on a nonstandard airflow
expressed in kilograms per cubic metre.
measurement technique, commonly used by manufacturers of
3.2.4 fan airflow rate, n—volumetric airflow rate at the fan
fan pressurization devices, but which has not been compared
air density expressed in cubic metres per second.
with standard airflow measurement techniques.
3.2.5 fan outlet area, n—gross inside area measured in the
1.6 This standard does not purport to address all of the
plane of the fan outlet opening expressed in square metres.
safety concerns, if any, associated with its use. It is the
3.2.6 fan pressure difference, n—the static pressure differ-
responsibility of the user of this standard to establish appro-
ence between two stations expressed in pascals, measured
priate safety and health practices and determine the applica-
usingthestaticpressuretapsdescribedinFig.1.Onestationis
bility of regulatory limitations prior to use.
located within the chamber between the fan and the nearest
2. Referenced Documents flow conditioners. The other station is outside the chamber.
3.2.7 fan pressurization system, n—a device for measuring
2.1 ASTM Standards:
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the air leakage rate of a building envelope under controlled
E631 Terminology of Building Constructions
pressurization or depressurization of the building interior. The
E779 Test Method for Determining Air Leakage Rate by
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system includes controllable air-moving equipment, an airflow
Fan Pressurization
ratemeasuringsystem,andadeviceformeasuringthepressure
2.2 American Society of Heating, Refrigerating, and Air-
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difference across the building envelope. Such a system is often
Conditioning Engineers Standard:
referred to as a blower door.
3.2.8 fan signal, n—an output from a fan pressurization
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This test method is under the jurisdiction of ASTM Committee E06 on system (other than fan speed) that is related to fan airflow rate
Performance of Building Constructions and is the direct responsibility of Subcom-
by the system calibration, such as the static pressure difference
mittee E06.41 on Infiltration Performances.
across a constriction that is integral to the system.
Current edition approved Oct. 1, 2003. Published October 2003. Originally
3.2.9 fan speed, n—speed of rotation of the fan impeller
approved in 1988. Last previous edition approved in 1998 as E1258–88 (1998).
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
expressed in inverse seconds.
contactASTM Customer Service at service@astm.org. ForAnnual Book ofASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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Available from American Society of Heating, Refrigerating, and Air- Available from American Society of Mechanical Engineers (ASME), ASME
Conditio
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