ASTM E2336-04
(Test Method)Standard Test Methods for Fire Resistive Grease Duct Enclosure Systems
Standard Test Methods for Fire Resistive Grease Duct Enclosure Systems
SCOPE
Note 1—The majority of this standard is based on the Model Building Code Evaluation Service Acceptance Criteria titled ACCEPTANCE CRITERIA FOR GREASE DUCT ENCLOSURE ASSEMBLIES, AC101, which was created in 1994. Numerous design listings and labeled materials exist based on the provisions of this standard.
1.1 These test methods evaluate the enclosure materials and the grease duct enclosure systems using the following test methods: noncombustibility, fire resistance, durability, internal fire, and fire-engulfment with a through-penetration fire stop.
1.2 These test methods prescribe a standardized fire exposure for comparing the test results of the enclosure materials and grease duct enclosure systems. The results of these tests are one factor in assessing predicted fire performance of grease duct enclosure systems. Using these test results to predict the performance of actual grease duct enclosure systems requires the evaluation of test conditions.
1.3 The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are for information only.
1.4 The text of these test methods references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the fire test response standard.
1.5 These test methods are used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.
1.6 These test methods do not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of these test methods to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.
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An American National Standard
Designation:E2336–04
Standard Test Methods for
Fire Resistive Grease Duct Enclosure Systems
This standard is issued under the fixed designation E 2336; 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 (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
The protection of grease ducts under fire exposure conditions is an item of importance in securing
constructions that are safe, and that are not a menace to neighboring construction nor to the public.
Recognition of this is registered in the codes of many authorities, municipal and other agencies. Many
types of enclosure materials are used to protect grease ducts. Normally, these enclosure materials are
eitherappliedtogreaseductsinthefieldorarefabricatedaspartofthegreaseductwhenshippedfrom
the factory. Evaluating enclosure materials used to protect a grease duct from fire is an aid for
predicting their fire performance and promotes uniformity in requirements of various authorities. To
do this it is necessary that the fire-endurance properties of enclosure materials be measured and
specifiedaccordingtoacommonstandardexpressedintermsthatareapplicablealiketoawidevariety
of materials, situations, and conditions of exposure.
1. Scope 1.5 These test methods are used to measure and describe the
response of materials, products, or assemblies to heat and
NOTE 1—The majority of this standard is based on the Model Building
flame under controlled conditions, but does not by itself
Code Evaluation Service Acceptance Criteria titled ACCEPTANCE
incorporate all factors required for fire hazard or fire risk
CRITERIA FOR GREASE DUCT ENCLOSURE ASSEMBLIES, AC101,
assessment of the materials, products, or assemblies under
which was created in 1994. Numerous design listings and labeled
materials exist based on the provisions of this standard.
actual fire conditions.
1.6 These test methods do not purport to address all of the
1.1 These test methods evaluate the enclosure materials and
safety concerns, if any, associated with its use. It is the
the grease duct enclosure systems using the following test
responsibility of the user of these test methods to establish
methods: noncombustibility, fire resistance, durability, internal
appropriate safety and health practices and to determine the
fire, and fire-engulfment with a through-penetration fire stop.
applicability of regulatory limitations prior to use.
1.2 These test methods prescribe a standardized fire expo-
sure for comparing the test results of the enclosure materials
2. Referenced Documents
andgreaseductenclosuresystems.Theresultsofthesetestsare
2.1 ASTM Standards:
one factor in assessing predicted fire performance of grease
C 518 Test Method for Steady state Heat Flux Measure-
duct enclosure systems. Using these test results to predict the
ments and Thermal Transmission Properties by Means of
performance of actual grease duct enclosure systems requires
the Heat Flow Meter Apparatus
the evaluation of test conditions.
C 569 Method of Test for Indentation Hardness of Pre-
1.3 The values stated in inch-pound units are to be regarded
formed Thermal Insulations
as the standard. The SI values given in parentheses are for
E 84 Test Method for Surface Burning Characteristics of
information only.
Building Materials
1.4 The text of these test methods references notes and
E 119 Test Methods for Fire Tests of Building Construction
footnotes which provide explanatory material. These notes and
and Materials
footnotes (excluding those in tables and figures) shall not be
E 136 Test Method for Behavior of Materials in a Vertical
considered as requirements of the fire test response standard.
Tube Furnace at 750°C
E 176 Terminology of Fire Standards
This test method is under the jurisdiction of ASTM Committee E05 on Fire
Standards and is the direct responsibility of Subcommittee E05.11 on Fire
Resistance. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2004. Published May 2004. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ICC Evaluation Service, Inc. (ICBO Evaluation Service, Inc.) 5360 Workman Standards volume information, refer to the standard’s Document Summary page on
Mill Road, Whittier, CA 90601-2298 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E2336–04
E 631 Terminology of Building Constructions 4.1.3 A durability test intended to simulate the effects of
E 814 Test Method for Fire Tests of Through-Penetration long-term exposure of typical in-service conditions on the
Fire Stops thermal transmission qualities of the enclosure materials when
2.2 Other Documents: subjected to a modified version of Test Method C 518.
UL385 Standard for Play Pipes forWater SupplyTesting in
4.1.4 An internal fire test uses two standardized fire expo-
Fire-Protection Service sures occurring inside the grease duct. Both tests illustrate the
enclosure material’s ability to resist thermal transmission of
3. Terminology
heat to the unexposed side in a horizontal application. The first
standardized fire exposure is intended to simulate long term
3.1 Definitions: For the purpose of this fire test response
exposure of the enclosure material to a standardized service
standard, the definitions given in Terminologies E 176 and
condition.The second standardized fire exposure is intended to
E 631, together with the following, shall apply:
simulate a standardized grease fire.
3.1.1 enclosure material, n—the product applied to the
4.1.5 A fire-engulfment test uses a standardized fire expo-
grease duct to provide fire resistance.
sure, the time temperature curve of Test Methods E 119, to
3.1.2 fire-separating element, n—floors, walls, and parti-
simulate a fire occurring on the outside of the grease duct, and
tions having a period of fire resistance determined in accor-
demonstrates the ability of the grease duct enclosure system to
dance with fire resistance test methods such as Test Methods
remain intact without a through opening. The fire-engulfment
E 119.
test also tests the fastening methods used to secure the
3.1.3 fire side, adj—the face of the test assembly or test
enclosure material to the grease duct and the supporting
specimen exposed to the heat or flame or both of the test
system. The fire-engulfment test also provides a means to test
apparatus.
a through-penetration fire stop to determine its compatibility
3.1.4 grease duct (also known as kitchen exhaust grease
with the grease duct enclosure system.
duct), n—a tube or conduit utilized for conveying air.
3.1.4.1 Discussion—It is usually equipped with an access
5. Significance and Use
opening for cleaning the orifice.
3.1.5 grease duct enclosure system, n—consists of the
5.1 These test methods are intended to evaluate the ability
grease duct, an enclosure material(s), a support and fastening
of the grease duct enclosure system to do the following:
system, and an access opening for cleaning the grease duct.
5.1.1 Resist the effects of a standardized fire exposure,
3.1.6 orifice, n—the continuous hollow area or opening
5.1.2 Retain its integrity, or
within the grease duct or combustion chamber.
5.1.3 Exhibit both properties dependent upon the type of
3.1.7 supporting construction, n—the arrangement of build-
test assembly involved during a predetermined test exposure.
ing sections forming the fire-separating elements into which
5.2 These test methods provide for the following measure-
the grease duct enclosure system is installed.
ments and evaluations where applicable:
3.1.8 test assembly, n—the complete assembly composed of
5.2.1 Capability of the enclosure material to resist flaming
a test specimen(s) together with its supporting construction.
(combustion) when exposed to 1382°F (750°C).
3.1.9 test specimen, n—a material, product, or assemblage
5.2.2 Loadbearing ability of the tested support system and
of a specific design, composition, density, and dimensions.
fastening system to carry the load of the grease duct enclosure
3.1.9.1 Discussion—the enclosure material or the grease
system during a standardized fire-engulfment test.
duct enclosure system are examples of test specimens.
5.2.3 Ability of a fire stop to meet the requirements of Test
3.1.10 unexposed side, n—the face or part not directly
Method E 814 when used with a grease duct enclosure system.
exposed to the heat or flame or both of the test apparatus.
5.2.4 Ability of the enclosure material to resist the passage
3.1.11 unexposed surface thermocouple, n—temperature-
of flames and hot gases during a standardized fire resistance
measuring device placed on the unexposed side.
test and a standardized internal fire test.
5.2.5 Transmission of heat through the grease duct and the
4. Summary of Test Method
enclosure material(s) during a standardized fire resistance test
4.1 Representative test specimens of the enclosure material
and a standardized internal fire test.
or the grease duct enclosure system are subjected to the
5.2.6 Ability of the grease duct enclosure system to resist
following tests. These test methods describe the following test
the passage of water during a standardized hose stream test.
sequence and procedures:
5.2.7 Comparativemeasurementoftemperatureagingofthe
4.1.1 A noncombustibilty test, Test Method E 136, demon-
enclosure material(s) when subjected to standardized cyclic
strates the enclosure material’s ability to resist combustion at a
thermal transmissions.
standardized temperature and duration.
5.3 These test methods do not provide the following:
4.1.2 A fire resistance test, Test Methods E 119, illustrates
5.3.1 Full information as to performance of the enclosure
the ability of the enclosure material to resist the effects of fire
material or the grease duct enclosure system constructed with
when applied in a vertical application.
components, densities, or dimensions other than those tested.
5.3.2 Evaluation of the degree by which the enclosure
material or grease duct enclosure system contributes to the fire
hazard by generation of smoke, toxic gases, or other products
Available from Underwriters Laboratories (UL), Corporate Progress, 333
Pfingsten Rd., Northbrook, IL 60062. of combustion.
E2336–04
5.3.3 Measurement of the degree of control or limitation of 6.4.1.2 Have a time constant between the range of 5.0 to 7.2
the passage of smoke or products of combustion through the min while encased in the tubes described in 6.4.1.1.
grease duct enclosure system. 6.4.2 Other types of E 119 protection tubes or pyrometers
5.3.4 Measurement of flame spread over the surface of the shall be used only when they give the same indications under
grease duct enclosure system. test conditions as those of 6.4.1.2 within the limit of accuracy
that applies for furnace-temperature measurements.
NOTE 2—The information in 5.3.2-5.3.4 is usually determined by other
suitable test methods. For example, 5.3.4 is typically determined using
NOTE 4—Atypical thermocouple assembly meeting these time constant
Test Method E 84.
requirements is fabricated by fusion-welding the twisted ends of No. 18
gage Chromel-Alumel wires, mounting the leads in porcelain insulators
5.4 Inthesetestmethods,thetestspecimensaresubjectedto
and inserting the assembly so the thermocouple bead is approximately 0.5
one or more specific tests under laboratory conditions. When
in. (25 mm) from the sealed end of the standard weight nominal ⁄2-in.
different test conditions are substituted or the end-use condi- 5
(25-mm) iron, steel, or Inconel pipe. The time constant for this and for
tions are changed, it is not always possible by, or from, these
several other thermocouple assemblies was measured in 1976. Another
testmethodstopredictchangestothecharacteristicsmeasured. option is to calculate the time constant from knowledge of its physical and
thermal properties.
Therefore,theresultsoftheselaboratorytestsarevalidonlyfor
the exposure conditions described in these test methods.
6.5 Pressure-sensing Probes—Where applicable, tolerances
5.5 Various test methods in these test methods require a test
are 65 % of dimensions shown in Fig. 4 or Fig. 5.
specimen to be exposed to a standard fire that is controlled to
6.5.1 The pressure-sensing probes shall be either aT-shaped
achieve specified temperatures throughout a specified time
sensor as shown in Fig. 4, or a tube sensor as shown in Fig. 5
period.The fire-engulfment and vertical fire resistance tests are
6.6 Unexposed Surface Thermocouples:
followed by the application of a standardized hose stream test.
6.6.1 The unexposed surface thermocouple wires, which
These test methods provide a relative measure of the fire-test-
shall be covered by the thermocouple pads described in 6.7
response of comparable enclosure materials and grease duct
during testing, shall not be heavier than No. 18 B and S gage
enclosure systems under these exposure conditions. The fire
(0.040 in.) (1.02 mm), and shall be electrically insulated with
exposure is not representative of all fire conditions because
heat-resistant and moisture-resistant coatings.
conditions vary with changes in the amount, nature and
6.7 Thermocouple Pads:
distribution of fire loading, ventilation, compartment size and
6.7.1 The thermocouple pads used to cover each thermo-
configuration,andheatsinkcharacteristicsofthecompartment.
couple on the unexposed side of the test specimen or test
Variation from the test conditions or test specimen construc-
assembly shall be made of either asbestos or refractory fiber
tion, such as size, materials, method of assembly, also affects
materials. All thermocouple pads shall be square and measure
the fire-test-response. For these reasons, evaluation of the
6 6 ⁄8 in. (152 6 3 mm) on each side. The properties of the
variation is required for application to construction in the field.
thermocouple pads shall have the following characteristics in
6.7.1.1 or 6.7.1.2.
6. Apparatus
NOTE 5—There are potential health concerns associated with the use of
6.1 Combustion Chamber—A tubular L-shaped assembly
asbestos pads. Most, if not all United States’ laboratories do not use
used with a gas-fired burner(s) capable of delivering the
asbestos pads. Further, in the United States these pads are very difficult to
minimum interior temperatures and minimum calorific value
acquire. However, ASTM International standards are used internationally
and some countries still use the asbestos pads.
(Btu input requirements) for the internal fire test as specified in
Sect
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