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Acoustical Noise Jackets (ANJ) provide noise attenuation in the range of 9-12 dBA when applied to “high noise applications” where unattenuated noise exceeds 95 dBA. The ANJ offers a cost effective solution for noise attenuation and may be applied during initial design, or retrofit to existing problem installations. The ANJ features a rugged, modular design custom fit to each piping configuration available. The custom fit design ensures maximum efficiency of noise attenuation and easy removal and reinstallation during maintenance.