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WebNov 15, 2002 · In addition, noise reduction is increased by providing absorption-lined tunnels for materials that have to be fed into and out of the enclosure. These "supplemented" barriers are easy to... WebThe item includes original accessories. The item may be a factory second. See the seller's listing for full details and description. See all condition definitions opens in a new window or tab. Brand. ZOHAN. Type. Headphones. EAN. 0704529021910. Noise Reduction Rating (NRR) 25 dB. ... 20 dB NRR Noise Reduction Rating Earmuffs Hearing Protection ... WebOur sound curtains are modular, velcro sealed, noise reducing curtains that are effective, rugged, and industrial grade in construction. Sound Curtain Warehouse Center Wall Opening Sound curtains are used in many industrial, commercial, and … cost of spectrum internet only