Noise Criterion NC & Room Criteria Calculator
HVAC acoustics & mechanical noise control: Evaluate octave band sound pressure levels against Noise Criterion ($NC$) and Room Criteria ($RC$) standards per ANSI/ASA S12.2.
Octave Band Sound Pressure Levels (dB)
ASHRAE Recommended NC Criteria
- NC 15–25: Concert halls, recording studios, broadcast rooms
- NC 25–30: Executive private offices, conference rooms, bedrooms
- NC 30–35: Classrooms, libraries, general private offices
- NC 35–40: Open-plan offices, dining rooms, lobbies
- NC 40–50: Corridors, cafeterias, kitchens, computer equipment
Acoustic Ratings
Noise Criterion (NC)
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Room Criteria (RC Mark II)
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Overall Sound Levels
A-Weighted Sound Level
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Calculated dBA equivalent
Limiting Octave Band
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Controls NC rating
Spectral Quality & Space Suitability
RC Spectral Quality Descriptor:
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Acoustic Space Suitability:
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Vibration / Rattle Hazard (16–63 Hz):
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