Help prevent noise- the No. 1 distraction in the workplace.


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Fine Fissured High NRC/CAC: CAC=40
Dune Second Look: CAC=35


  • CAC rates a ceiling structure’s efficiency as a barrier to airborne sound intrusion between two closed rooms, over the speech frequency range.

  • It is an especially significant measure in providing acoustic privacy between adjacent work areas, where sound can penetrate plenum spaces and carry to other spaces.

  • CAC is stated as a minimum value; CAC minimum 25 is acceptable in open plan offices, while a rating of minimum 35 or 40 is preferred for closed offices. (Reference: AS 2499:2000, ASTM E 1414-00a)