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An introduction to the Noise Rating - NR - Curve developed by the International Organization for Standardization (ISO)
The Noise Rating - NR - Curve is developed by the International Organization for Standardization (ISO 1973) to determine the acceptable indoor environment for hearing preservation, speech communication and annoyance. How to screenshot in mac air.
The noise rating graphs for different sound pressure levels are plotted at acceptable sound pressure levels at different frequencies. Acceptable sound pressure level vary with the room and the use of it. Different curves are obtained for each type of use. Each curve is obtained by a NR number.
Note! Noise Rating - NR - is commonly used in Europe. The Noise Criterion - NC - is more common in USA. https://barsmicforttip1972.mystrikingly.com/blog/timeedition-2-2018.
Recommended Noise Rating - NR - Levels
The Noise Rating level should not exceed the values listed below:
| Maximum Noise Rating Level | Application |
|---|---|
| NR 25 | Concert halls, broadcasting and recording studios, churches |
| NR 30 | Private dwellings, hospitals, theaters, cinemas, conference rooms |
| NR 35 | Libraries, museums, court rooms, schools, hospitals operating theaters and wards, flats, hotels, executive offices |
| NR 40 | Halls, corridors, cloakrooms, restaurants, night clubs, offices, shops |
| NR 45 | Department stores, supermarkets, canteens, general offices |
| NR 50 | Typing pools, offices with business machines |
| NR 60 | Light engineering works |
| NR 70 | Foundries, heavy engineering works |
Noise Rating Curves
| Maximum Sound Pressure Level (dB) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Noise Rating - NR - Curve | Octave band mid-frequency (Hz) | ||||||||
| 31.5 | 62.5 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 | |
| NR 0 | 55 | 36 | 22 | 12 | 5 | 0 | -4 | -6 | -8 |
| NR 10 | 62 | 43 | 31 | 21 | 15 | 10 | 7 | 4 | 2 |
| NR 20 | 69 | 51 | 39 | 31 | 24 | 20 | 17 | 14 | 13 |
| NR 30 | 76 | 59 | 48 | 40 | 34 | 30 | 27 | 25 | 23 |
| NR 40 | 83 | 67 | 57 | 49 | 44 | 40 | 37 | 35 | 33 |
| NR 50 | 89 | 75 | 66 | 59 | 54 | 50 | 47 | 45 | 44 |
| NR 60 | 96 | 83 | 74 | 68 | 63 | 60 | 57 | 55 | 54 |
| NR 70 | 103 | 91 | 83 | 77 | 73 | 70 | 68 | 66 | 64 |
| NR 80 | 110 | 99 | 92 | 86 | 83 | 80 | 78 | 76 | 74 |
| NR 90 | 117 | 107 | 100 | 96 | 93 | 90 | 88 | 86 | 85 |
| NR 100 | 124 | 115 | 109 | 105 | 102 | 100 | 98 | 96 | 95 |
| NR 110 | 130 | 122 | 118 | 114 | 112 | 110 | 108 | 107 | 105 |
| NR 120 | 137 | 130 | 126 | 124 | 122 | 120 | 118 | 117 | 116 |
| NR 130 | 144 | 138 | 135 | 133 | 131 | 130 | 128 | 127 | 126 |
NR - Noise Rating Diagram
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Example - Estimating NR - Noise Rating
The sound pressure levels for different NR frequencies are measured to
- 31.5 Hz : 40 dB
- 62.5 Hz : 40 dB
- 125 Hz : 50 dB
- 250 Hz : 55 dB
- 500 Hz : 60 dB
- 1000 Hz : 50 dB
- 2000 Hz : 55 dB
- 4000 Hz : 45 dB
- 8000 Hz : 45 dB
The Noise Rating - NR - can be estimated as indicated in the spreadsheet diagram below to approximately
NR = 58 dB
Open the NR - Noise Rating example in your browser!
You can save and modify your own copy of the example above if you are signed into your Google Account.
Related Topics
- Acoustics - Room acoustics and acoustic properties - decibel A, B and C - Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation
- Noise and Attenuation - Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems
Related Documents
- Acoustic Calculation of Ventilation Systems - Procedure for acoustic noise calculation of ventilation systems
- Age and Shift in Hearing Threshold - Shift in hearing threshold for men and women
- Comparing Noise Criteria - Comparing Noise Criteria - Noise Criterion (NC, NCB, RNC), Noise Rating (NR) and dB(A)
- NC - Noise Criterion - Noise Criterion - NC - level is a standard describing relative loudness of a space with a range of frequencies
- Noise Criterion - NC - Online Calculator - An online Noise Criterion - NC - Calculator
- Noise Rating - NR - Online Calculator - An online Noise Rating - NR - Calculator
- PNC - Preferred Noise Criterion - Noise measurement system for continuous or ambient noise in indoor environments
- Preferred Noise Criterion - PNC - Calculator - An online Preferred Noise Criterion - PNC - calculator
- Sound - Frequency, Wavelength and Octave - An introduction to the nature of sound - frequency, wavelength and octave
- Sound Intensity, Power and Pressure Levels - Introduction to decibel, sound power, sound intensity and sound pressure
- Sound Pressure - Sound Pressure is the force of sound on a surface area perpendicular to the direction of sound
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Sound Studio 4 9 54 Inch
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Our SCIF compliant acoustical door assemblies are designed and manufactured for your defense related needs. Up to STC 55
ASTM A 1008
JUIAF
All assemblies are available manual or power operated.
Door, frame, perimeter sound seals, and door bottom are supplied as part of the complete tested assembly.
| Acoustical Rating | Bullet Resistance |
|---|---|
| STC 45 - 48 | UL Level 1 & 2 |
| STC 49 - 53 | UL Level 3 |
Additionally, Cam Lift Hinges and an aluminum threshold are included with high STC rated assemblies.
Sound Studio 4 9 54 Cm
View Krieger Recommended Hardware
Sound Studio 4 9 54 Ft
Sound Studio 4 9 54 +
Wood veneer interior acoustical doors may be finish-sanded, primed, sealed with conversion synthetic sealer or completely prefinished prior to shipping.
Stainless steel finishes can be embossed, patterned, etched, bead blasted and colored. Bronze, brass, copper, and plastic laminate finishes are also available.
View Finish Options
