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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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