- 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.
- 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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