Range of sound levels |
Range of NC curves |
||
dB A |
NC |
||
Large buildings | Radio and TV studios......................................... | 25-30 |
20-25 |
Concert and opera halls..................................... | 25-35 |
20-30 |
|
Churches........................................................ | 25-35 |
20-30 |
|
Theaters, Multipurpose halls............................... | 25-35 |
20-30 |
|
Libraries, Museums............................................ | 25-35 |
20-30 |
|
Schools, Classrooms.......................................... | 30-40 |
25-35 |
|
Cinema........................................................... | 35-45 |
30-40 |
|
Banquet halls................................................... | 40-50 |
35-45 |
|
Hospitals | Private rooms................................................... | 30-40 |
25-35 |
Operation Theaters........................................... | 35-45 |
30-40 |
|
Halls, Laboratories............................................ | 35-45 |
30-40 |
|
Waiting rooms.................................................. | 40-50 |
35-45 |
|
Offices | Board rooms.................................................... | 25-35 |
20-30 |
Conference rooms............................................ | 30-40 |
25-35 |
|
Executive Offices............................................. | 35-45 |
30-40 |
|
General open offices......................................... | 35-45 |
30-40 |
|
Typing pools.................................................... | 40-50 |
35-45 |
|
Computer rooms............................................... | 45-65 |
40-55 |
|
Hotels, Restaurants | Rooms............................................................ | 30-40 |
25-35 |
and stores | Restaurants..................................................... | 35-45 |
30-40 |
Halls, Lobbies................................................... | 35-45 |
30-40 |
|
Stores............................................................ | 40-50 |
35-45 |
|
Supermarkets.................................................. | 45-55 |
40-50 |
|
Residential | Single Family homes (rural and suburban).............. | 25-35 |
20-30 |
Buildings | Single Family homes (urban)............................... | 30-40 |
25-35 |
Apartment buildings.......................................... | 35-45 |
30-40 |
|
Factories | Light machinery, assembly lines........................... | 50-70 |
45-65 |
foundries, heavy machinery................................ | 60-80 |
55-75 |
|
Damage risk criteria | 90 |
85 |