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Technical Terms Swirl Diffuser Terminal units VAV Sound Attenuators

Suggested Design Levels For Sound Control In Airconditioning System

 

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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