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Catalogue
Technical Terms Swirl Diffuser Terminal units VAV Sound Attenuators

Suggested Sound Levels

   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
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