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Catalogue
Technical Terms Swirl Diffuser Terminal units VAV Sound Attenuators

Suggested Sound Levels

 
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
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