RC - Room Criteria
Room Criteria - RC - measures background sound in a building over the frequency range 16 Hz to 4000 Hz.
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Room Criteria (RC) measures background noise in a building over the frequency range 16 Hz to 4000 Hz.
This rating system requires determination of the mid-frequency average level and determining the perceived balance between high and low frequency sound.
| Type of Room - Space Type | Recommended RC Level RC Curve |
Equivalent Sound Level dBA |
| Apartments | 25-35 (N)1) | 35-45 |
| Assembly Halls | 25-30 (N) | 35-40 |
| Churches | 30-35 (N) | 40-45 |
| Courtrooms | 30-40 (N) | 40-50 |
| Factories | 40-65 (N) | 50-75 |
| Hotels/Motels | ||
| - Individual rooms or suites | 30-35 (N) | 35-45 |
| - Meeting or banquet rooms | 25-35 (N) | 35-45 |
| - Service and Support Areas | 40-45 (N) | 45-50 |
| - Halls, corridors, lobbies | 35-40 (N) | 50-55 |
| Offices | ||
| - Conference rooms | 25-30 (N) | 35-40 |
| - Private | 30-35 (N) | 40-45 |
| - Open-plan areas | 35-40 (N) | 45-50 |
| - Business machines/computers | 40-45 (N) | 50-55 |
| Hospitals and Clinics | ||
| - Private rooms | 25-30 (N) | 35-40 |
| - Operating rooms | 25-30 (N) | 35-40 |
| - Wards | 30-35 (N) | 40-45 |
| - Laboratories | 35-40 (N) | 45-50 |
| - Corridors | 30-35 (N) | 40-45 |
| - Public areas | 35-40 (N) | 45-50 |
| Schools | ||
| - Lecture and classrooms | 25-30 (N) | 35-40 |
| - Open-plan classrooms | 30-40 (N) | 45-50 |
| Movie motion picture theaters | 30-35 (N) | 40-45 |
| Libraries | 35-40 (N) | 40-50 |
| Legitimate theaters | 20-25 (N) | 30-65 |
| Private Residences | 25-35 (N) | 35-45 |
| Restaurants | 40-45 (N) | 50-55 |
| TV Broadcast studies | 15-25 (N) | 25-35 |
| Recording Studios | 15-20 (N) | 25-30 |
| Concert and recital halls | 15-20 (N) | 25-30 |
| Sport Coliseums | 45-55 (N) | 55-65 |
| Recording studios | 15-20 (N) | 25-30 |
1) Neutral (N). The levels in the octave bands centered at 500 Hz and below must not exceed the octave-band levels of the reference spectrum by more than 5 dB at any point in the range; the levels in the octave bands centered at 1000 Hz and above must not exceed the octave-band level of the reference spectrum by more than 3 dB at any point in the range.
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