ASTM F2608-15(2022)

Standard Test Method for Determining the Change in Room Air Particulate Counts as a Result of the Vacuum Cleaning Process

SIGNIFICANCE AND USE
4.1 In this test method, the amount of particulate generated into the air by operating a vacuum cleaner over a specific floor covering that is contaminated with dust will be determined. Particles from the motor, floor covering, and the test dust will all be measured. The amount of dust generated in the laboratory practice will differ from that in residential/commercial installations because of variations in floor coverings, soil and other solid particulate compositions, the vacuuming process used by individual operators, the air exchange rate of heating, ventilation, and air conditioning (HVAC) systems, and other factors.  
4.2 To provide a uniform basis for measuring the performance in 4.1, a standardized test chamber, equipment, floor covering material, and dust particulate are used in this test method.  
4.3 Due to the large range of generated particle counts observed among products in the vacuum cleaner industry at the present time, the test results of the maximum particle counts generated under this test method are expressed in Log10 equivalents for evaluation and comparison of product performance.
SCOPE
1.1 This test method provides a laboratory test for the measurement of particulate generated as a direct result of the vacuuming process.  
1.2 This test method is applicable to all residential/commercial uprights, canisters, stickvacs, central vacuum systems, and combination cleaners.  
1.3 This test method applies to test dust removal from floor coverings not the removal of surface litter and debris.  
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 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.

General Information

• Status: Published
• Publication Date: 31-Dec-2021
• ICS: 13.040.20 - Ambient atmospheres
• Technical Committee: F11 - Vacuum Cleaners
• Drafting Committee: F11.23 - Filtration

Relations

• Refers: ASTM F608-24 - Standard Test Method for Evaluation of Carpet Embedded Dirt Removal Effectiveness of Household/Commercial Vacuum Cleaners
• Effective Date: 01-Jan-2024
• Refers: ASTM F1334-24 - Standard Test Method for Determining A-Weighted Sound Power Level of Vacuum Cleaners
• Effective Date: 01-Jan-2024
• Refers: ASTM F1409-23 - Standard Test Method for Straight Line Movement of Vacuum Cleaners While Cleaning Carpets
• Effective Date: 01-Sep-2023
• Refers: ASTM F608-17 - Standard Test Method for Evaluation of Carpet Embedded Dirt Removal Effectiveness of Household/Commercial Vacuum Cleaners
• Effective Date: 01-Mar-2017
• Refers: ASTM F1334-14 - Standard Test Method for Determining A-Weighted Sound Power Level of Vacuum Cleaners
• Effective Date: 01-Aug-2014
• Refers: ASTM F608-13 - Standard Test Method for Evaluation of Carpet Embedded Dirt Removal Effectiveness of Household/Commercial Vacuum Cleaners
• Effective Date: 01-Aug-2013
• Refers: ASTM F1334-12 - Standard Test Method for Determining A-Weighted Sound Power Level of Vacuum Cleaners
• Effective Date: 01-Jun-2012
• Refers: ASTM F555-01(2011) - Standard Test Method for Motor Life Evaluation of an Upright Vacuum Cleaner
• Effective Date: 01-Nov-2011
• Refers: ASTM F884-01(2011) - Standard Test Method for Motor Life Evaluation of a Built-In (Central Vacuum) Vacuum Cleaner
• Effective Date: 01-Nov-2011
• Refers: ASTM F655-11 - Standard Specification for Test Carpets and Pads for Vacuum Cleaner Testing
• Effective Date: 01-Nov-2011
• Refers: ASTM F1038-02(2011) - Standard Test Method for Motor Life Evaluation of a Canister, Hand-held, Stick, and Utility Type Vacuum Cleaner Without a Driven Agitator
• Effective Date: 01-Nov-2011
• Refers: ASTM F922-01(2011) - Standard Test Method for Motor Life Evaluation of an Electric Motorized Nozzle
• Effective Date: 01-Nov-2011
• Refers: ASTM F1334-11 - Standard Test Method for Determining A-Weighted Sound Power Level of Vacuum Cleaners
• Effective Date: 01-Nov-2011
• Refers: ASTM F608-11 - Standard Test Method for Evaluation of Carpet Embedded Dirt Removal Effectiveness of Household/Commercial Vacuum Cleaners
• Effective Date: 01-May-2011
• Refers: ASTM F1409-00(2010) - Standard Test Method for Straight Line Movement of Vacuum Cleaners While Cleaning Carpets
• Effective Date: 01-Oct-2010

Overview

ASTM F2608-15(2022), titled Standard Test Method for Determining the Change in Room Air Particulate Counts as a Result of the Vacuum Cleaning Process, is an international standard developed by ASTM International. The standard establishes a laboratory method to measure airborne particulate matter generated by vacuum cleaners when used on dust-contaminated floor coverings. With widespread use of vacuum cleaners in both residential and commercial settings, this test method provides a consistent process to evaluate and compare the impact of different vacuum technologies on indoor air quality.

Key Topics

• Purpose: The test quantifies the increase in room air particulates resulting directly from the vacuuming process. The scope includes particulates released from the vacuum cleaner’s motor, the floor covering, and the dust introduced for testing.
• Applicability: The method can be applied to all types of vacuum cleaners, including residential and commercial uprights, canisters, stick vacuums, central vacuum systems, and combination cleaners.
• Standardization: To ensure comparability, the testing is conducted using standardized floor covering materials, dust particulates, equipment, and an environmentally controlled test chamber. This minimizes the effect of external variables such as operator technique or building HVAC systems.
• Measurement: Airborne particulate counts are measured during and after vacuum operation, focusing mainly on particles greater than 0.3 microns. Results are expressed in Log10 equivalents, allowing for effective comparison between products.
• Performance Evaluation: The data supports evaluation of a vacuum cleaner’s emissions performance, providing laboratories, manufacturers, and stakeholders with a uniform benchmark.

Applications

• Product Development and Quality Control: Manufacturers use ASTM F2608 to assess and improve vacuum cleaner filtration systems, ensuring lower emissions of fine particulates that can affect indoor air quality.
• Regulatory and Health Compliance: The standard supports regulatory bodies and researchers in determining compliance with indoor air quality requirements, especially as related to dust and allergens.
• Comparative Product Analysis: Test results enable objective comparisons between vacuum cleaner models, aiding purchasers and institutions in selecting equipment with better emission control.
• Standardized Procurement: Commercial facilities, schools, and healthcare institutions rely on standardized particulate emission data for informed decision-making when specifying or procuring vacuum equipment.

Related Standards

For a comprehensive evaluation of vacuum cleaner performance, ASTM F2608 references and aligns with several related standards, including:

• ASTM F608 – Test Method for Evaluation of Carpet Embedded Dirt Removal Effectiveness of Household/Commercial Vacuum Cleaners
• ASTM F655 – Specification for Test Carpets and Pads for Vacuum Cleaner Testing
• ASTM F1334 – Test Method for Determining A-Weighted Sound Power Level of Vacuum Cleaners
• ASTM F1409 – Test Method for Straight Line Movement of Vacuum Cleaners While Cleaning Carpets
• ANSI/AHAM AC-1 – Test Method for Performance of Portable Household Electric Room Air Cleaners
• IEC 60312 – Vacuum Cleaners for Household Use-Methods for Measuring the Performance

These related standards complement ASTM F2608 by covering multiple aspects of vacuum cleaner performance, such as noise levels, motor durability, cleaning effectiveness, and environmental impact.

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By providing a standardized and repeatable approach, ASTM F2608-15(2022) helps ensure greater transparency and confidence in the assessment of vacuum cleaner particulate emissions, ultimately supporting improved indoor air quality and informed product selection. The methodology is vital for manufacturers, laboratories, regulatory bodies, and procurement professionals focused on air quality, health, and equipment performance.

Standards Content (Sample)

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.
Designation: F2608 − 15 (Reapproved 2022)
Standard Test Method for
Determining the Change in Room Air Particulate Counts as
a Result of the Vacuum Cleaning Process
This standard is issued under the fixed designation F2608; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope F884Test Method for Motor Life Evaluation of a Built-In
(Central Vacuum) Vacuum Cleaner
1.1 This test method provides a laboratory test for the
F922Test Method for Motor Life Evaluation of an Electric
measurement of particulate generated as a direct result of the
Motorized Nozzle
vacuuming process.
F1038Test Method for Motor Life Evaluation of a Canister,
1.2 This test method is applicable to all residential/
Hand-held, Stick, and UtilityTypeVacuum CleanerWith-
commercial uprights, canisters, stickvacs, central vacuum
out a Driven Agitator
systems, and combination cleaners.
F1334Test Method for Determining A-Weighted Sound
1.3 This test method applies to test dust removal from floor Power Level of Vacuum Cleaners
F1409Test Method for Straight Line Movement of Vacuum
coverings not the removal of surface litter and debris.
Cleaners While Cleaning Carpets
1.4 The values stated in SI units are to be regarded as
2.2 AHAM Standard:
standard. The values given in parentheses are for information
ANSI/AHAM AC-1-2006Test Method for Performance of
only.
Portable Household Electric Room Air Cleaners
1.5 This standard does not purport to address all of the
2.3 Other References:
safety concerns, if any, associated with its use. It is the
IEC 60312Vacuum Cleaners for Household Use—Methods
responsibility of the user of this standard to establish appro-
for Measuring the Performance
priate safety, health, and environmental practices and deter-
Standard LaboratoryPractice for Quantifying Respirable
mine the applicability of regulatory limitations prior to use.
Particulate Emissions Generated by Residential/
1.6 This international standard was developed in accor-
Commercial Vacuums and Central Vacuum Systems, Car-
dance with internationally recognized principles on standard-
pet and Rug Institute, 12/4/02
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3. Terminology
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3.1 Definitions:
3.1.1 model, n—designation of a group of vacuum cleaners
2. Referenced Documents
having identical mechanical and electrical construction with
2.1 ASTM Standards:
only cosmetic or nonfunctional differences.
F555Test Method for Motor Life Evaluation of an Upright
3.1.2 population, n—total of all units of a particular model
Vacuum Cleaner
vacuum cleaner being tested.
F608Test Method for Evaluation of Carpet Embedded Dirt
3.1.3 repeatability limit, n—value below which the absolute
Removal Effectiveness of Household/Commercial
difference between two individual test results obtained under
Vacuum Cleaners
the repeatability condition may be expected to occur with a
F655Specification for Test Carpets and Pads for Vacuum
probability of approximately 0.95 (95%).
Cleaner Testing
3.1.4 test run, n—definitive procedure that produces a sin-
ThistestmethodisunderthejurisdictionofASTMCommitteeF11onVacuum gular measured result.
Cleaners and is the direct responsibility of Subcommittee F11.23 on Filtration.
3.1.5 unit, n—single vacuum cleaner of the model being
Current edition approved Jan. 1, 2022. Published January 2022. Originally
ɛ1
tested.
approved in 2007. Last previous edition approved in 2015 as F2608–15 . DOI:
10.1520/F2608-15R22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from the Association of Home Appliance Manufacturers, 19th St.
the ASTM website. NW, Suite 402, Washington, DC 20036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2608 − 15 (2022)
4. Significance and Use 5.2.2 Framework—Standard 5.1 by 10.2 cm (2 by 4 in.) or
equivalent construction sealed to the floor line with caulking
4.1 In this test method, the amount of particulate generated
compound.
into the air by operating a vacuum cleaner over a specific floor
5.2.3 Walls—Anyhard,cleanablesurface,suchaswallboard
covering that is contaminated with dust will be determined.
(sealed with a washable latex semi-gloss paint) or stainless
Particles from the motor, floor covering, and the test dust will
steel. Seal with caulking compound.
all be measured. The amount of dust generated in the labora-
5.2.4 Flooring—Any hard, seamless cleanable surface such
tory practice will differ from that in residential/commercial
asseamlessfull-widthvinyl,stainlesssteel,orsealedconcrete.
installations because of variations in floor coverings, soil and
5.2.5 Filtration—HEPA filtration (>99.97% at 0.3 µm, 0.5
other solid particulate compositions, the vacuuming process
3 3
m /s (1000 ft /min) minimum).
used by individual operators, the air exchange rate of heating,
5.2.6 Motor and Blower for Conditioning Loop—0.35-m /s
ventilation, and air conditioning (HVAC) systems, and other
(750-ft /min) fan.
factors.
5.2.7 Relative Humidity—50 65%.
4.2 To provide a uniform basis for measuring the perfor-
5.2.8 Temperature—21 6 1.5°C (70 6 5°F).
mance in 4.1, a standardized test chamber, equipment, floor
5.2.9 Chamber Sealing—Chamber sealing shall be verified
covering material, and dust particulate are used in this test
as follows: Particulate level in the sealed room shall not rise
method. 3
above 1000 particles/ft at≥0.3 µm after 20 min of HEPAoff,
with the room static.
4.3 Due to the large range of generated particle counts
observedamongproductsinthevacuumcleanerindustryatthe
5.3 Real-time aerosol particle counter in the range of 0.3 to
present time, the test results of the maximum particle counts
5 µm. A laser photometer may be used, in addition to the
generated under this test method are expressed in Log
10 particle counter, with a range of 0.1 to 1000 µg/m .
equivalents for evaluation and comparison of product perfor-
5.4 Particulate sampling pickoff probe shall be 152.4 6
mance.
12.7cm (60 6 5 in.) above the test carpet, facing up, on
centerline of carpet.
5. Apparatus
5.5 Weighing Scale (for Weighing Test Dirt), accurate to
5.1 An air-conditioned laboratory at 21 6 –1.5 °C
0.01g(0.000353oz)andhavingaweighingcapacityofatleast
(70 65°F)and50%relativehumidity 65%istobeusedfor
100 g (3.53 oz) for weighing the dust for embedding.
sample preparation.
5.6 Dirt Embedment Tool—Roller may be locked or un-
5.2 Environmentally Controlled Test Chamber (per ANSI/
locked (see Fig. 1).
AHAM AC-1-2006):
5.2.1 Chamber Size—Nominal dimensions of 3.2 by 3.7 by 5.7 Dirt Dispenser—Dispensing system that provides the
2.4 m (10.5 by 12 by 8 ft) up to a 20% difference in volume operator with a method to distribute the test dirt uniformly on
is permitted. the carpet test area.
FIG. 1 Dirt Embedment Tool
F2608 − 15 (2022)
TABLE 1 ISO 12103-1, A2 Fine Test Dust Particle Distribution
5.8 Voltmeter, to measure input volts to the vacuum cleaner,
to provide measurements accurate within 61%. Cumulative Volume Numeric Data
Size, µm Less Than, %
5.9 Voltage-Regulator System, to control the input voltage
12.6
to the vacuum cleaner. The regulator shall be capable of
211.3
maintaining the vacuum cleaner’s rated voltage 61% and
3 20.4
4 28.9
rated frequency having a wave form that is essentially sinusoi-
5 35.8
dal with 3% maximum harmonic distortion for the duration of
7 44.6
the test.
10 52.9
20 70.7
5.10 Carpet bed length of 182.9 cm (72 in.) and minimum
40 88.2
width of 68.6 cm (27 in.). See an example of a suitable 80 99.8
cleaning bed apparatus in Fig. 2.
5.11 Drive for carpet or vacuum cleaner capable of main-
7. Sampling
taining specified test speed of 55 cm/s (1.8 ft/s) both forward
7.1 A minimum of three units of the same model vacuum
and reverse in a straight pattern. Bed must be equipped with
cleaner selected at random, in accordance with good statistical
brackets to hold the test vacuum handle at 80 cm (31.5 in.)
practice, shall constitute the population sample.
above the test material.
7.2 To determine the best estimate of the total particulate
5.12 If moving the vacuum cleaner, a suitable system is
counts during the activity of cleaning for the population of the
described inTest Method F608.Travel length and width are as
vacuumcleanermodelbeingtested,thearithmeticmeanofthe
specified in the procedure.
particulate level in the air rating of the samples from the
5.13 Tachometer or equivalent device for calibrating con-
populationshallbeestablishedbytestingtoa90%confidence
veyor or vacuum drive speed.
level within 65% of the mean value.
5.14 Rotating Agitator Conditioning Vacuum Cleaner/
7.3 AnnexA1 provides a procedural example for determin-
Equipment or a Central Vacuum Cleaning System equipped
ing the 90% confidence level and when the sample size shall
with a powered, rotating agitator-equipped nozzle, for condi-
be increased.
tioning new test carpets and removing residual dirt from the
test carpet before each test run. This cannot be the unit tested.
8. Standard Test Carpet Preparation
8.1 Cut panels as needed of the test carpet, specified in 6.1,
6. Materials
to a size of 68.6 cm (27 in.) warp by 182.9 cm (72 in.) fill.
6.1 Level Loop Carpet and Padding, as described in Speci-
8.2 Markthecarpetpanel(s)withtestidentificationnumbers
fication F655.
for later reference.
6.2 ISO 12103-A2 Arizona Test Dust (IEC 60312)—Weigh
8.3 Preconditioning New Test Carpet Panels:
andrecord10goftestdustinaroommeetingtherequirements
8.3.1 Vacuum new test carpet panels using a rotating
of 5.1. See Table 1 for a description of the dust.
agitator-equipped vacuum cleaner to remove any loose mate-
NOTE 1—Relative humidity can have a significant effect upon the
weight and amount of test dust. rials before soiling and testing.
FIG. 2 Cleaning Bed Apparatus
F2608 − 15 (2022)
8.3.2 Vacuumthecarpetwiththefirststrokeinthedirection 8.5.10 Recordthephotometerreadings(ifused)andparticle
of the pile lay and continue vacuuming the entire area of the countsfromstep8.5.7forthe0.3,0.5,and1.0µmparticlesize
carpetuntillessthan2gofcarpetfiberorsoilispickedupafter ranges.Thisinformationwillactasabaselineforreferenceand
5 min of cleaning. calibrationchecksafterevery20testrunsperformedonthetest
carpet. Replace carpeting or evaluate potential problems with
8.4 Reconditioning Used Carpet Panels:
test system whenever the particle counts from reference and
8.4.1 Using the vacuum cleaner or a central vacuum clean-
calibrationchecksoftestcarpetvaryfromthebaselinelevelby
ingsystemlistedin5.14,cleanthenentirecarpetareafor5min
620%.
using a stroke rate of 0.55 m/s (1.8 ft/s) in the direction of the
pile lay to ensure removal of all residual dust embedded in the
9. Test Chamber Setup and Conditioning
carpet. Clean the test chamber in accordance with 9.2.
9.1 All components involved in the test shall remain and be
8.5 Clean Carpet Particle Background Counts—Perform
exposed in the controlled environment for at least 16 h before
the following test to establish a baseline for clean carpet
the start of the test.
particle counts for use in referencing and calibration checks.
9.2 Test Chamber Cleaning Procedure—Tobeperformedas
Thistestistobeperformedwhencarpetisnewandafterevery
needed:
20 test runs.
9.2.1 Using the vacuum cleaner or a central vacuum clean-
8.5.1 Position the test carpet on the supporting surface.
ing system listed in 5.14, clean all surfaces of the test chamber
8.5.2 Mark a baseline test area 40 by 102 cm (16 by 40 in.).
and equipment to remove all residual dust.
This area is based upon a standard nozzle width of 25 cm (10
9.2.2 Wipe down all surfaces of the test equipment with a
in.), plus an additional 7.6 cm (3 in.) per side. Nozzle width is
tack cloth or damp rag to remove any dust not removed by the
measured at the extreme outside dimension of the nozzle. For
vacuum cleaner.
nozzle widths exceeding 25 cm (10 in.), the test area width
shall be increased accordingly.
10. Vacuum Cleaners
8.5.3 Place the control vacuum cleaner with new bag and
filters on the test carpet 10 to 15 cm (4 to 6 in.) in front of the
10.1 New Test Vacuum Cleaners:
testarea.Setthedriveruntoincludecarpetanadditional10to
10.1.1 Preconditioning a New Test Vacuum Cleaner—Run
15 cm (4 to 6 in.) after the test area as well.
the vacuum cleaner in at rated voltage (61%) and frequency
8.5.4 Exit the test chamber and initiate the particulate
(61 Hz) with filters in place for 1 h.
counter or photometer or both. Set the instrument(s) to take
10.1.1.1 Preconditioning Rotating Agitator-Type Vacuum
continuous readings throughout the duration of the test. The
Cleaner—In a stationary position, operate the vacuum cleaner
particle counter range sizes are 0.3, 0.5, and 1.0 µm (other
for 1 h with the agitator bristles not engaged on any surface.
particle size ranges are optional).
10.1.1.2 Preconditioning a Straight Air Canister Vacuum
8.5.5 Energize the chamber purge/room air purifier until the
Cleaner—Operatethevacuumcleanerfor1hwithawide-open
baseline particulate level is under 1000 particles/ft at 0.3 µm
inlet (without hose).
and count variation is under 10% for 5 min at the 0.3-µm
10.2 Used Test Vacuum Cleaners:
range. For the photometer, the µg/m baseline should be less
3 10.2.1 Recondition a Used Vacuum Cleaner—Before each
than1µg/m ,withavariationoflessthan10%fromthemean.
test run:
8.5.6 De-energize both the chamber purge/room air purifier
10.2.1.1 Thoroughly remove excess dirt from the vacuum
and room-conditioning equipment.
cleaner. Without using tools for disassembly, clean the entire
NOTE 2—Testing is to be conducted in a static environment. outersurface,brushes,nozzlechamber,ductwork,insideofthe
chamber surrounding the primary filter, and inside hose and
8.5.7 Immediately energize vacuum and monitor particle
wands.
counts (and concentration if using photometer) for 10 min. A
10.2.1.2 For vacuum cleaners using disposable filters as the
hard surface or a method for raising the agitator off of the
primary filters, use a new disposable primary filter from the
carpet should be employed to protect the carpet during this
manufacturer for each test.
portion of the test. If a hard surface is employed it shall not be
10.2.1.3 For vacuum cleaners using non-disposable dirt
included in the test strokes.
receptacles, empty in accordance with the manufacturer’s
8.5.8 Set conveyor or vacuum stroke counter at the proper
instructions after each test run, clean the receptacle, and then
number of strokes to accomplish 10 min 6 5 s of back and
installitasrecommendedbythevacuumcleanermanufacturer.
forth vacuuming at 55 cm/s (1.8 ft/s), then energize conveyor
and continue to monitor particle counts (and concentration if
NOTE4—Effectivenessofthiscleaningcanbeseenintheuniformityof
using photometer). the successive runs.
8.5.9 At the conclusion of 10 min of vacuuming, de-
10.3 Test Vacuum Cleaner Settings—If various settings are
energize the conveyor with the vacuum in its original position,
provided, set the motor speed setting, suction regulator, nozzle
then de-energize the vacuum.
height, or combination thereof using the manufacturer’s speci-
fications as provided in the instruction manual for this type of
NOTE 3—For products employing a soft dust bag, emissions generated
carpet.Contactthemanufacturerifnoinstructionsaregivenor
due to bag collapse (“blow-back”) when powering down will be moni-
tored and captured during the settling period of this test. if the instructions are unclear or inadequate.
F2608 − 15 (2022)
10.4 The settings to be used for this test method (nozzle, as well. Set the handle height to 80 cm (31.5 in.) above the
motor speed, suction regulator, and so forth) shall be the same carpet.Non-pivotingheadsshouldbeleftatthemanufacturer’s
settings that are used in conducting straight line movement set position.
(Test Method F1409), sound power (Test Method F1334),
NOTE6—Theactualpositionofthecanistermaybedependentuponthe
embedded dirt cleaning effectiveness (Test Method F608), and
length of the hose.
motor life evaluation (Test Methods F
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