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IAC DUCT SILENCERS - IAC Acoustics
duct would require 57 feet of one-inch-thick, 1.5 lb/ft. 3-density, surface-coated, duct-liner material to achieve as much insertion loss (i.e. 32 dB) as one five-foot-long IAC 5 LFS Silencer. In the lower frequencies, such as 125 Hz, even greater lengths of duct lining would be required to achieve the 10 - 20 dB insertion loss typically achiev-
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