Range of | Range of | ||
sound levels | 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 |