Noise Criteria Curves: RC
Noise Criteria (NC) and Room Criteria (RC) curves for HVAC acoustics design. NC curves per ANSI S12.2-2008 from NC-15 through NC-70 (12 curves), and RC Mark II curves per ASHRAE from RC-25 through RC-50 (6 curves). Each curve has 8 octave band center frequencies (63-8000 Hz) with maximum allowable sound pressure levels in dB. Includes recommended occupancy type and equivalent dBA background noise level. 144 records total.
| criterion type | curve point | background noise dBA equivalent (dBA) | max sound pressure level dB (dB) | notes | octave band center Hz (Hz) | rating | recommended occupancy |
|---|---|---|---|---|---|---|---|
| RC | RC-25#1000 | 35 | 25 | RC-25 at 1000 Hz octave band; reference tangency frequency band | 1,000 | RC-25 | hospital |
| RC | RC-25#125 | 35 | 45 | RC-25 at 125 Hz octave band | 125 | RC-25 | hospital |
| RC | RC-25#2000 | 35 | 21 | RC-25 at 2000 Hz octave band | 2,000 | RC-25 | hospital |
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