ASTM F431-21

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F431 − 04 (Reapproved 2013) F431 − 21 An American National Standard
Standard Specification for
Air Performance Measurement Plenum Chamber for Vacuum
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Cleaners
This standard is issued under the fixed designation F431; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers the acceptable details and tolerances for the plenum chamber used in specified air performance
measurement tests for vacuum cleaners.
1.2 The plenum chamber is designed for vacuum measurements only. (Warning—The plenum chamber has been shown to
accurately determine maximum air power values at various test points for vacuum cleaners. There is a possibility that the airflow
values measured with orifices larger than 2 in. at high flow rates may be erroneous due to the proximity of the top and bottom
surfaces to the orifice plate inlet.)The plenum chamber has been shown to accurately determine maximum air power values at
various test points for vacuum cleaners. There is a possibility that the airflow values measured with orifices larger than 2 in. at high
flow rates may be erroneous due to the proximity of the top and bottom surfaces to the orifice plate inlet.)
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
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2.1 ASTM Standards:
F558 Test Method for Measuring Air Performance Characteristics of Vacuum Cleaners
F820 Test Method for Measuring Air Performance Characteristics of Central Vacuum Cleaning Systems
F2105
2.2 ASTM Adjunct:
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Orifice Plate Holder Details (F431)
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2.3 ISO Standard:
ISO 5167-2:2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits
running full — Part 2: Orifice plates
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This specification is under the jurisdiction of ASTM Committee F11 on Vacuum Cleaners and is the direct responsibility of Subcommittee F11.22 on Air Performance.
Current edition approved May 1, 2013Feb. 1, 2021. Published July 2013February 2021. Originally approved in 1975. Last previous edition approved in 20082013 as
F431 – 04 (2008).(2013). DOI: 10.1520/F0431-04R13.10.1520/F0431-21.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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Available from ASTM International Headquarters. Order Adjunct No. ADJF4031. Original adjunct produced in 1987.
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Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F431 − 21
3. Details
3.1 Plenum chambers conforming to this specification shall be fabricated in accordance with the dimensions, tolerances, and notes
shown in the following figures:
3.1.1 Plenum chamber assembly, see Fig. 1.
3.1.2 Orifice plate detail, see Fig. 2.
3.1.3 Orifice plate holder and assembly, see Fig. 3.
3.2 Manometer connection detail, see Fig. 1(f), Note 17.
4. Orifice Plates
4.1 Orifice plates conforming to this specification shall be fabricated in accordance to the dimensions, tolerances, and notes shown
in the following figure:
4.1.1 Orifice plate dimensional detail, see Fig. 2(a).
4.1.2 Acceptable machined edges for orifice plates, see Fig. 2(b).
5. Keywords
5.1 air performance; orifice plate; plenum chamber; vacuum cleaner
FIG. 1 (a) Plenum Chamber (Material: see Note 8)
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F431 − 21
FIG. 1 (b) Hose Connector Plate (Material: 0.250-in. (6.35-mm) Steel) (continued)
FIG. 1 (c) Hose Connector (Material: Aluminum or Steel—see Note 16) (continued)
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