1.1 This test method covers the laboratory testing of some of the acoustical properties of sound attenuating devices including duct liner materials, integral ducts, and in-duct absorptive straight and elbow silencers used in the ventilation systems of buildings. Procedures are described for the measurement of acoustical insertion loss, airflow generated noise, and pressure drop as a function of airflow.<\/p>\n
1.2 Excluded from the scope are reactive mufflers and those designed for uses other than in ventilation systems, such as automobile mufflers.<\/p>\n
1.3 This test method includes a provision for a simulated semi-reflective plenum to fit around thin-walled duct and silencer test specimens, since the acoustical environments around such thin-walled specimens can affect the measured insertion loss.<\/p>\n
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 and health practices and determine the applicability of regulatory limitations prior to use.<\/p>\n
1.4 This method tests the performance of the specimen in well-defined and controlled conditions. If the specimen is installed in the field in any different manner, the results may be different. This standard does not provide estimating procedures for determining the actual installed performance of the specimen field conditions.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | Scope Referenced Documents Terminology <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | Summary of Test Method Significance and Use <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Test Facilities FIG. 1 <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | FIG. 2 <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Apparatus and Methods of Measurement for Airflow and Pressure Drop Test Specimen <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Measurement of Insertion Loss (With or Without Airflow) FIG. 3 FIG. 4 <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Sound Power Level Measurements for Airflow Generated Noise FIG. 5 <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Report Precision and Bias <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Keywords A1. LABORATORY ACCREDITATION A1.1 Scope A1.2 Laboratory Information and Procedures A1.3 Reference Tests A2. MOCK-UP TEST PROCEDURES A2.1 A2.2 A2.3 <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" E477-06 Standard Test Method for Measuring Acoustical and Airflow Performance of Duct Liner Materials and Prefabricated Silencers<\/b><\/p>\n |