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RC - Room Criteria

Room Criteria - RC - measuring background noise in a building over frequencies ranging 16 Hz to 4000 Hz

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Room Criteria (RC) measures the background noise in buildings over frequencies ranging 16 Hz to 4000 Hz.

RC requires a determination of the mid-frequency average level and the perceived balance between high and low frequency sound.

Type of Room - Space TypeRecommended RC Level
RC Curve
Equivalent Sound Level
dB(A)
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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