1、Designation: E1414/E1414M 16Standard Test Method forAirborne Sound Attenuation Between Rooms Sharing aCommon Ceiling Plenum1This standard is issued under the fixed designation E1414/E1414M; the number immediately following the designation indicates the yearof original adoption or, in the case of rev
2、ision, 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.INTRODUCTIONThis test method is designed to measure the sound attenuation provided by a suspended ceiling inthe
3、 presence of a continuous plenum space under prescribed laboratory test conditions. The testmethod is an adaptation ofAMA1-II-1967 Method of Test. This modified test method may give resultsdiffering from the AMA-1-II procedure.1. Scope1.1 This test method utilizes a laboratory space so arrangedthat
4、it simulates a pair of horizontally adjacent small offices orrooms separated by a partition and sharing a common plenumspace. The partition either extends to the underside of acommon plenum space or penetrates through it. In the pre-scribed configuration, special design features of the facilityensur
5、e that the only significant sound transmission path is byway of the ceiling and the plenum space.1.2 Within the limitations outlined in the significancestatement, the primary quantity measured by this test method isthe ceiling attenuation of a suspended ceiling installed in alaboratory environment.
6、By accounting for receiving roomsound absorption, the normalized ceiling attenuation may bedetermined.1.3 The test method may also be used to evaluate theattenuation of composite ceiling systems comprised of theceiling material and other components such as luminaires andventilating systems.1.4 The f
7、ield performance of a ceiling system may differsignificantly from the results obtained by this test method (seeSection 5, Significance and Use, and Test Method E336).1.5 The procedures may also be used to study the additionalsound insulation that may be achieved by other attenuationmeasures. This wo
8、uld include materials used either as plenumbarriers or as backing for all or part of the ceiling.1.6 The facility may also be used to study the performanceof an integrated system comprising plenum, ceiling, andpartition, tested as a single assembly.1.7 The values stated in either SI units or inch-po
9、und unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.8 This standard does not purport to
10、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:2C423 Test
11、Method for SoundAbsorption and SoundAbsorp-tion Coefficients by the Reverberation Room MethodC634 Terminology Relating to Building and EnvironmentalAcousticsC636 Practice for Installation of Metal Ceiling SuspensionSystems for Acoustical Tile and Lay-In PanelsE90 Test Method for Laboratory Measureme
12、nt of AirborneSound Transmission Loss of Building Partitions andElementsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE336 Test Method for Measurement of Airborne SoundAttenuation between Rooms in Buildings1This test method is under the jurisdiction ofASTM Committee E33 on
13、 Buildingand Environmental Acoustics and is the direct responsibility of SubcommitteeE33.03 on Sound Transmission.Current edition approved Oct. 1, 2016. Published October 2016. Originallyapproved in 1991. Last previous edition approved in 2011 as E1414/E1414M 11a1. DOI: 10.1520/E1414_E1414M-16.2For
14、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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700,
15、West Conshohocken, PA 19428-2959. United States1E413 Classification for Rating Sound InsulationE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ANSI Standards:S1.11 Specification for Octave-Band and Fractional-OctaveBand Analog and Digital Filters32
16、.3 Other Standards:AMA 1-II-1967 Method of Test, Standard Specification forCeiling Sound Transmission Test by Two Room Method43. Terminology3.1 DefinitionsFor definitions of terms used in this testmethod see Terminology C634.3.2 Definitions of Terms Specific to This Standard:3.2.1 ceiling attenuatio
17、n (Dc)the noise reduction betweenthe source and receiving rooms where flanking transmission byall paths are at least 10 decibels lower than the path through theceiling and plenum.Dc5 L12 L2(1)where L1is the average one-third octave band sound pres-sure level in the source room; L2is the average one-
18、thirdoctave band sound pressure level in the receiving room.3.2.2 normalized ceiling attenuation (Dn,c)the ceiling at-tenuation adjusted to account for receiving room absorption.Dn,c5 Dc1Nf(2)where Nfis the normalization term defined in 3.2.3.3.2.3 normalization term(Nf)the adjustment term deter-min
19、ed in 9.3 which normalizes the ceiling attenuation toaccount for receiving room absorption.3.2.4 ceiling attenuation class (CAC)a single figure ratingderived from the normalized ceiling attenuation values inaccordance with Classification E413, except that the resultantrating shall be designated ceil
20、ing attenuation class.3.2.5 plenum spacethe whole of the void above thesuspended ceilings in both rooms. Its dimensions are to bemeasured, discounting the thickness of any sound absorbingmaterial either adhered to walls or laid on the back of the testceiling.3.2.6 direct sound fieldthe sound that re
21、sults from anacoustical source without reflection from boundaries.3.2.7 reverberant sound fieldthe sound in an enclosed orpartially enclosed space that has been reflected repeatedly fromthe enclosure boundaries.4. Summary of Test Method4.1 The laboratory test facility consists of an outer shelldivid
22、ed into two rooms by a partition and a suspended ceiling(the test specimen). The partition between the two rooms mayextend up to, or through, the suspended ceiling, dependingupon whether the specific test specimen is designed to becontinuous or interrupted at the partition line. The rooms arebuilt s
23、o that the only significant sound transmission pathbetween them is that provided by the test specimen and theceiling plenum. All other sound transmission paths must benegligible. The ceiling attenuation is determined in each of thetest frequency bands, by placing a sound source in one roomand then c
24、alculating the difference of the average soundpressure levels in both rooms. For the purposes of this testmethod, the room containing the sound source is designated thesource room and the other, the receiving room.4.2 The measurement of a normalized ceiling attenuationrequires that the value of a no
25、rmalization term dependent uponthe amount of sound absorption present in the receiving roombe known. Two alternate methods are used for the determina-tion of this normalization term.5. Significance and Use5.1 Modern offices and other multipurpose buildings com-monly have suspended acoustical ceiling
26、s installed over roomdividing partitions. The test facility prescribed in this testmethod is useful for providing ceiling attenuation data on therelevant ceiling/partition elements and systems, to ensure thatthe transmission of sound through the ceiling and plenumspace, or through the combination of
27、 ceiling, plenum space,and partition systems, provides a suitable degree of acousticalisolation.5.2 This test method is useful for rating and specifying,under standardized conditions, the sound attenuation perfor-mance of ceiling materials when mounted in a specifiedsuspension system.5.3 This test m
28、ethod may be useful for selecting a wall-ceiling system for probable compliance with a performancespecification for overall sound isolation between rooms.However, the actual field performance may differ significantly,particularly if the field plenum depth is not within the limitsspecified in this te
29、st method or if the plenum space containslarge ducts, beams, etc., or both. (See Test Method E336.)5.4 The flexibility inherent in the test facility enablesevaluation of the effects of penetrations, induced leakage paths,luminaire, and air diffuser installations and discontinuities inthe ceiling sus
30、pension system at the partition line, includingpenetration of the partition into the ceiling plenum. The effectof installing plenum barriers at the partition line may also beinvestigated.5.5 With the concentration of sound absorbent area offeredby a suspended sound absorbent ceiling installed in a r
31、oom, itis not possible to obtain a good approximation to a diffusesound field in that room. The plenum dimensions prevent themaintenance of a diffuse sound field above the test specimen.These factors affect the values of the measured ceiling soundattenuation and thus the measurements are not a funda
32、mentalproperty of the ceiling. The test method measures the acousti-cal properties attainable under the prescribed test conditions,which have been arbitrarily selected. The conditions must beadhered to in every test facility so that the measured results willbe consistent. Two methods for obtaining A
33、, the receiving room3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Method of theAmerican Board ProductsAssoc., (formerlyAcoustical MaterialsAssoc.) available from Ceiling and Interior Systems Contracting Assoc., 1800Pic
34、kwick Ave., Glenview, IL 60025.E1414/E1414M 162absorption, are given without preference. One method, knownas the steady state method, has been used to obtain an estimatefor A in the AMA 1-II-1967 standard. The other methodfollows the procedures used in Test Methods E90 and C423;justification for the
35、 use of this method may be found inreference (1)5. Persons wishing to further investigate thelimitations imposed by this test method are advised to readreferences (2), (3), (4) and (5).5.6 Notwithstanding the above limitations, this type of testmethod has been used successfully for a number of years
36、 torank order commercial ceiling systems and the test results arecommonly used for this purpose.6. Test Signal6.1 Signal SpectrumThe sound signal used for this testshall constitute a band or bands of random noise with acontinuous distribution of frequencies over each test band.6.2 BandwidthThe measu
37、rement bandwidth shall be one-third octave. Specifically the overall frequency response of thefilter or filters, in the source and microphone amplifiers, shallconform to ANSI Specification S 1.11-2004 (R2009) for class1,13 octave band filters.6.3 Standard Test FrequenciesThe minimum frequencyrange s
38、hall be a series of contiguous one-third octave bandswith geometric center frequencies from 125 to 4000 Hz.7. Test Arrangement7.1 The essential features of the test facility are given below.7.1.1 Room ConstructionThe rooms shall be rectangularin shape and cross-section. The walls, floor, doors, and
39、roofshould provide sufficient acoustical isolation to reduce externalnoise levels to at least 10 dB below the lowest test signal level.The sound absorption in each of the rooms should be made aslow as possible in order to achieve the best possible diffusefield condition. The average sound absorption
40、 coefficients ofthe floor and all vertical surfaces below the test ceiling shouldnot exceed 0.1 at any of the octave band center frequenciesgiven in 7.1.5.1. It is recommended that a structural disconti-nuity be provided close to the mid-point between the rooms tominimize flanking sound transmission
41、, allowing high values ofceiling attenuation to be measured. The total length of eachside wall, including the vibration break (if any), shall be 25 65 ft 7.5 6 1.5 m and the width of the room shall be 15.25 60.75 ft 4.65 6 0.23 m. The overall height shall be 12 6 0.5ft 3.65 6 0.15 m. All dimensions
42、shall be measured inter-nally. Fig. 1 shows the major dimensions of the test rooms.7.1.2 Separating WallThe separating wall shall be of suchdesign that the sound power transmitted through it is at least 10dB less than the total sound power transmitted through theceiling specimen. This requirement ma
43、y be checked by mea-suring the Dcwith the calibration ceiling referenced in A1.2,inan interrupted configuration, and an effective gypsum boardplenum closure above the partition. All of the separating wallexterior surfaces shall be acoustically reflective. The wall shallbe tapered at its upper extrem
44、ity so that its overall thickness atthe top, with the cap installed, is 73 6 0.1 in. 6 6 2.5 mm .The taper angle shall be not less than 45 from the ceilingplane. The height of the wall shall be such that the top exactlymeets the lower surface of the ceiling specimen. In the case ofinterrupted ceilin
45、g systems a 50 6 2 6 0.1 in. by 3 6 0.1 in.2.5 mm by 75 6 2.5 mm wooden adaptor cap shall beinstalled. The length of the adaptor cap shall be identical to thewidth of the wall. The capping should be designed to simulatea practical header condition typical of the type used for theceiling being tested
46、. The wall shall be installed near themid-point of the test room so that two rooms are formed. Thetwo rooms shall not differ in length by more than 15 %.NOTE 1One wall design which has been found to be effective isshown in Fig. 2.7.1.3 Plenum DepthThe plenum depth shall be 30 6 1 in.760 6 25 mm at t
47、he separating wall. At other places withinthe room, the plenum depth tolerance may be relaxed to 62.5in. 664 mm.7.1.4 Plenum WidthThe plenum width shall be 14.1 6 0.1ft 4.3 6 0.02 m at the separating wall (Fig. 3).At other pointsin the room, the plenum width should be the same as the fullroom width
48、(see 3.2.5). The restriction in plenum width at theseparating wall may be achieved by means of suitable pilastersinstalled either from floor to roof or from the level of theceiling underside to the roof.7.1.5 Plenum Lining:7.1.5.1 All side walls of the plenum shall be lined withsuitable sound absorb
49、ing material not less than 76 mm (3 in.)thick. This material, shall when tested in accordance with TestMethod C423 in a Type A mounting, have random incidencesound absorption coefficients not less than those shown below:Octave Band CenterFrequency, Hz125 250 500 1000 2000 4000Absorption Coeffi-cient0.65 0.80 0.80 0.80 0.80 0.80NOTE 2A suitable plenum lining has been found to be a 6-in. thickglass fiber bat with a thin impervious membrane at a depth of 112 in.below the exposed face.7.1.5.2 Aledge or shelf, as wide as the plenum lining but not
