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  1. The same as STC rating except as measured in the field in accordance with standard methods. The FSTC is used to quantify actual as-built partition transmission loss across the frequency range of speech sounds. The FSTC incorporates corrections for receiving room sound absorption and requirements to assess and eliminate sound flanking paths.
  2. Sound transmission class calculated in accordance with Classification E 413 using values of field transmission loss. Source: http://www.owenscorning.com/around/sound/glossary.asp

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