1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOctober 5, 20051SUBJECT 2518OUTLINE OF INVESTIGATIONFORAIR DISPERSION SYSTEM MATERIALSIssue Number: 1October 5, 2005Summary of TopicsThis First Issue of the Outline of Investigation for Air Dispe
2、rsion Systemscovers materials for use in accordance with the following InstallationCodes:a) Standard of the National Fire Protection Association for theInstallation of Air-Conditioning and Ventilating Systems, NFPA No.90A;b) Standard of the National Fire Protection Association for theInstallation of
3、 Warm Air Heating and Air-Conditioning Systems,NFPA No. 90B;c) The 2003 International Mechanical Code(IMC); andd) The 1997 CBO Uniform Mechanical CodeTM(UMC)The air dispersion system materials covered by these requirementsinclude preformed lengths of fabric or non-fabric products intended toconvey a
4、nd distribute air.The UL Foreword is no longer located within the UL Standard. For informationconcerning the use and application of the requirements contained in thisStandard, the current version of the UL Foreword is located onULStandardsInfoNet at: http:/ 2005 UNDERWRITERS LABORATORIES INC.UL COPY
5、RIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 5, 2005SUBJECT 25182No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Components 43 Uni
6、ts of Measurement .54 Undated References 5PERFORMANCE5 Tests for Weight and Air Permeability .56 Test for Surface Burning Characteristics .57 Mold Growth and Humidity Test 68 Temperature Test .68.1 General .68.2 Low temperature .68.3 High temperature .79 Erosion Test 79.1 General .79.2 Test installa
7、tion 89.3 Test method .910 Pressure Test .9MARKING11 Content 10INSTRUCTIONS12 Installation Instructions 11APPENDIX AOCTOBER 5, 2005 SUBJECT 2518 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements apply t
8、o air dispersion system materials for use in accordance with the followingInstallation Codes:a) Standard of the National Fire Protection Association for the Installation of Air-Conditioningand Ventilating Systems, NFPA No. 90A;b) Standard of the National Fire Protection Association for the Installat
9、ion of Warm Air Heatingand Air-Conditioning Systems, NFPA No. 90B;c) The 2003 International Mechanical Code (IMC); andd) The 1997 CBO Uniform Mechanical CodeTM(UMC).1.2 The air dispersion system materials covered by these requirements include preformed lengths offabric or non-fabric products intende
10、d to convey and distribute air.1.3 These air dispersion system materials are intended to be limited for use in air handling systems inexposed locations operating under positive pressure.1.4 These requirements do not intend to address the joints between sections of air dispersion systemmaterials or e
11、nd connections.2 Components2.1 Except as indicated in 2.2, a component of a product covered by this outline shall comply with therequirements for that component.2.2 A component need not comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of
12、 the component in theproduct covered by this outline, orb) Is superseded by a requirement in this outline.2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.2.4 Specific components are incomplete in construction features or restricted in perform
13、ance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.OCTOBER 5, 2005SUBJECT 25184UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTR
14、IBUTION WITHOUT PERMISSION FROM UL3 Units of Measurement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.4 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this outline shall b
15、einterpreted as referring to the latest edition of that code or standard.PERFORMANCE5 Tests for Weight and Air Permeability5.1 Representative samples of fabric air dispersion system materials shall be evaluated for weight inaccordance with the Standard Test Method for Mass Per Unit Area (Weight) of
16、Fabric, ASTM D 3776, ona minimum of five specimens. Weight in units of ounces per square yard (g/m2) shall be determined andincluded with the Installation Instructions for the product in accordance with 12.2.5.2 Representative samples of fabric air dispersion system materials shall be evaluated for
17、AirPermeability in accordance with the Standard Test Method for Air Permeability of Textile Fabrics, ASTMD 737, on a minimum of ten specimens. Air permeability in units of ft3/min/ft2(cm3/s/cm2) shall bedetermined and included with the Installation Instructions for the product in accordance with 12.
18、3.6 Test for Surface Burning Characteristics6.1 Representative samples of air dispersion system materials shall be evaluated for surface burningcharacteristics according to the requirements in 6.2 and 6.6.6.2 Tests for surface burning characteristics are to be conducted as specified in the Standard
19、for Test forSurface Burning Characteristics of Building Materials, UL 723. For the purpose of establishing the flamespread and smoke developed indices, typically a minimum of three tests are to be conducted.6.3 Samples are to be positioned in the 25 foot (7.62 m) long fire test chamber specified in
20、the Standardfor Test for Surface Burning Characteristics of Building Materials, UL 723. When required, 1/4 inch (6.4mm) diameter steel rods shall be used to support the materials. When supporting rods are used, they areto be spaced between 2 feet and 4 feet (0.6 m and 1.2 m) apart as required for su
21、pport of the samples.6.4 When the inside and outside surfaces of an air dispersion system material are of differentcomposition, tests for surface burning characteristics are to be conducted by exposing first one side andthen the other to the test conditions, using different samples for each exposure
22、. A third test is then to beconducted on the worse case condition using a different sample for the exposure.6.5 Fabrics, tapes, or other joining materials forming part of an air dispersion product or other partsidentified as a component of the product are to be in place during the tests for surface
23、burningcharacteristics. When, however, the application of the fabric, tape, or other joining material to the sampleis likely to affect the various surface burning characteristic indices, samples are to be tested with andwithout longitudinal seams or joints, and the higher indices taken.OCTOBER 5, 20
24、05 SUBJECT 2518 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6.6 All materials shall have a flame-spread index of not over 25 without evidence of continuedprogressive combustion and a smoke-developed index of not over 50.7 Mold Growth and
25、Humidity Test7.1 Materials for air dispersion system products, including any tapes, fabrics, cements, or other materialsshall be resistant to the effects of high humidity under standard atmospheric temperature conditions. Themold shall not spread beyond the inoculated area, and no significant growth
26、 of mold is to be observed.Materials shall not become deformed or delaminated; tapes, casings, and lining shall remain securely inplace; and joints shall not open or show evidence of separation.7.2 Three samples representing typical wall areas of the assembled air dispersion system materials areto b
27、e prepared. Each sample is to be 4 by 4 inches (102 by 102 mm) square and is to include any joiningmaterials.7.3 Mold mycelia and spores using Chaetomium Globosium are to be applied to the samples. Thesamples are to be placed in a closed vessel in which an atmosphere saturated with water vapor ismai
28、ntained at room temperature and under dark conditions. The samples are to remain in this atmosphereuntil the extent of growth has been demonstrated or until the mold and spores have disintegrated, and notless than 60 days.7.4 The samples then are to be examined visually for extent of mold growth and
29、 for indications ofdeterioration in wall structure, exterior casing, inner lining, tapes, and fabrics.8 Temperature Test8.1 General8.1.1 Materials for air dispersion system products, including any tapes, fabrics, cements, or othermaterials shall be resistant to the effects of the temperatures to whi
30、ch they are exposed in the followingtests.8.2 Low temperature8.2.1 Material shall not become deformed or show delamination; tapes, casings, and lining shall remainsecurely in place; and joints shall not open or show evidence of separation when a sample is subjectedto the test described in 8.2.2 8.2.
31、4.8.2.2 Three samples representing typical wall areas of the assembled product are to be prepared. Eachsample is to be 8 by 8 inches (203 by 203 mm) square.8.2.3 The samples are to be placed in a closed vessel in which an atmosphere saturated with water vaporis maintained at room temperature for a p
32、eriod of 48 hours. The samples then are to be removed andimmediately placed in a refrigerated compartment and maintained at a temperature of minus 17.8C (0F)for a period of 24 hours.OCTOBER 5, 2005SUBJECT 25186UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PER
33、MISSION FROM UL8.2.4 The samples shall then be removed from the refrigerated compartment and allowed to beconditioned at 23 2C (73 4F) and 50 5 percent relative humidity for at least 24 hours. The samplesthen are to be examined visually for indications of deterioration in wall structure, exterior ca
34、sing or interiorlinings, tapes, fabrics, and cements.8.3 High temperature8.3.1 To comply with the requirements of 8.1.1, the exterior and interior surfaces of samples of airdispersion system sections are to be simultaneously exposed to air maintained at not less than 51.7C(125F) on the exterior and
35、not less than 129.4C (265F) on the interior. Any arrangement using samplesof air dispersion system sections shall be employed. The test arrangement is to provide means formaintaining air at the specified test temperatures in moving contact with the two surfaces of the testsamples. As a result of the
36、 test described in 8.3.2 8.3.4, structural material shall not become deformedor show delamination; tapes, casings, and lining shall remain securely in place; and joints shall not openor show evidence of separation.8.3.2 At least two representative samples are to be specified and prepared for this te
37、st. When the productis of uniform grade, thickness, and cross section the samples are to be chosen from the smaller sizes.Sections, varying in grade and thickness with size, may also require samples in other size ranges.8.3.3 Each sample is to be 3 feet (0.91 m) long. At least one end of each sample
38、 is to be attached to ametal collar in accordance with the manufacturers instructions.8.3.4 The conditions of test are to be maintained for a period of 60 days. The samples shall then beremoved and conditioned at 23 2C (73 4F) and 50 5 percent relative humidity for at least 24 hours.The samples then
39、 are to be examined visually for indications of deterioration in wall structure, exteriorcasings or interior linings, tapes, fabrics, and cements.9 Erosion Test9.1 General9.1.1 Material for air dispersion systems shall not break away, crack, peel, flake off, or show evidence ofdelamination or contin
40、ued erosion when air is passed through typical sections at a velocity of two andone-half times the manufacturers rated velocity, and not less than 2500 feet per minute (762 m/min). Forthe purpose of this requirement, continued erosion is identified to be either a constant or increasing rateof erosio
41、n.OCTOBER 5, 2005 SUBJECT 2518 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9.2 Test installation9.2.1 Previously untested representative samples are to be prepared on the basis of grade, thickness,size, and shape. Consideration is to be g
42、iven to tested samples which are vulnerable to damage underthe conditions of test. Such samples may include air dispersion system materials prepared with arepresentative field splice of a type as specified by the manufacturer. Samples of non-symmetrical crosssection are to be evaluated in the orient
43、ations identified as being vulnerable under the conditions of test.9.2.2 In assembling the test samples, all materials are to be extended to their full length. Any adhesivesor cements are to be allowed to cure for a period of at least 24 hours. Samples are not to be exposed torelative humidity great
44、er than 70 percent during the 24-hour period prior to test.9.2.3 The sample or samples are to be arranged in an L-shaped assembly as described in Figure 9.1,having a length of not less than six times the major inside dimension of the air dispersion system section.The assembly is to be bent at a radi
45、us equivalent to the inside diameter of the air dispersion system toform the 90-degree bend. The entire assembly is to have similar cross sections.This is generated text for figtxt.9.2.4 Connection to the outlet of the fan is to be by means of a transformation piece of any intendedmaterial to provid
46、e for uniform air entry to the test sample. The fan is to have the capacity to provide amaximum velocity of two and one-half times the maximum velocity specified by the manufacturer, but notless than 2500 feet per minute (762 m/min) of air at room temperature.Figure 9.1Erosion testOCTOBER 5, 2005SUB
47、JECT 25188UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9.2.5 The air velocity for purposes of the test is to be measured by a pitot tube, or direct-readingvelometer, positioned in the center of the outlet end of the sample. Room air handled
48、 by the fan andranging in temperature between 15.6 and 37.8C (60 and 100F) shall be employed.9.2.6 The inlet of the air fan used for the test is to be covered with a double layer of cheesecloth (14 to15 square yards per pound (0.026 to 0.028 m2/g) and known to the trade as count of 32 by 28).9.2.7 A
49、 damper, when employed for regulating velocity in the system, is to be located between the screenand the fan or between the fan and the inlet of the test sample.9.2.8 A collecting screen consisting of a double layer of cheesecloth, as specified in 9.2.6, stretched tauton a frame sized to provide for an area not less than five times the inside cross-sectional area of the testsample, is to be located 1 foot (0.30 m) from the outlet end of the test sample.9.3 Test method9.3.1 Air is to be passed through the
