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ADC TEST STANDARDS
6.2.3 Acoustical Performance
When acoustical properties are claimed, the duct shall be tested in accordance with ASTM E477 and/or ADC Test Code FD 72 - R1. Data shall be presented in the following form:
6.2.3.1 Attenuation
Sound attenuation test data shall be reported by tabulation in either dB/lineal foot [dB/m] or as dB for specified length (such as dB/3 ft. [1.0 m] or dB/12 ft. [3.7 m]). In either case, the table of values shall show attenuation at center frequencies of 125, 250, 500, 1000, 2000, 4000 hertz. The table shall also indicate whether determinations were made with or without air flowing and the maximum velocity range to which data is applicable. Because this data is not necessarily linear, the limits of linearity shall be stated. Notes shall accompany data explaining the limits of use. No additional attenuation may be claimed for lengths greater than the lengths tested.
6.2.3.2 Sound Generation
Sound generation test data shall be reported for at least four different velocities selected from the following range of velocities (shall include maximum rated velocity): 400, 800, 1000, 1500, 2000, 2500, 3000, 4000 and 6000 fpm [2.0, 4.1, 5.1, 7.6, 10.2, 12.7, 15.2, 20.3 and 30.5 m/s]. Sound generation test data shall be reported by tabulation in either dB/linear foot {dB/m] or dB for specified length tested. Tabulated data shall show sound generation at center frequencies of 125, 250, 500, 1000, 2000 and 4000 hertz.
6.2.3.3 Radiated Noise
Radiated noise reduction shall be reported with 0 air flow and at one flow of 2500 fpm [12.7 m/z] velocity or the option of 4000 [20.3] or 6000 [30.5] fpm [m/s] velocity for each duct diameter tested.
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Radiated noise reduction shall be reported as dB/linear foot [dB/m] or dB for a specified length at center frequencies of 125, 250, 500, 1000, 200 and 4000 hertz.
6.2.4 Static Pressure/Temperature Performance
Flexible duct shall be tested under simultaneous temperature and pressure conditions in accordance with ADC Test Code FD 72 - R1.
Test temperatures and times under this standard shall be:
Continuous Temperature/Time - 140°F [60°C] for 164 hours. Intermittent Temperature/Time - 180°F [82°C] for 4 hours.
For purpose of recommended performance values in Section 6.1, a 12” [300 mm] nominal internal duct size shall be tested. In addition, the smallest and largest size of the diameter range shall be tested for comparative performance verification.
6.2.5 Duct Leakage
Duct leakage shall be determined in accordance with ADC Test Code FD 72 - R1 or UL 181 Standard. Leakage for ducts that includes fittings and connections shall be listed in accordance with the UL 181 Standard. Duct leakage shall be reported as an average leakage rate of air volume loss per unit internal diameter per unit length (CFM/in. dia./ ft.) [L/s/mm dia./m].
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