Recommended ANSI Levels

Occupancy
NCB Curve
Broadcast Studios (distant microphone pickup used)
10
Concert halls, opera houses, and recital halls (listening to faint musical sounds)
10-15
Large auditoriums, large drama theatres, and large churches (for very good speech articulation)
15-20
TV and broadcast studios (close microphone pickup only)
15-25
Private Residences:
          Bedrooms
25-30
          Apartments
28-38
          Family rooms and living rooms
28-38
Schools:
          Lecture and classrooms
25-30
          Open-plan classrooms
33-37
Hotels/Motels:
          Individual rooms or suites
28-33
          Meeting/banquet rooms
25-35
          Halls, corridors, lobbies
38-43
          Service support areas
38-48
Office Buildings:
          Executive offices
25-30
          Conference rooms (large)
25-30
          Conference rooms (small) and private offices
30-35
          General secretarial areas
38-43
          Open-plan areas
35-40
          Business machines/computers
38-43
          Public circulation
38-48
Hospitals and clinics:
          Private rooms
25-30
          Wards
30-35
          Operating rooms
25-30
          Laboratories
33-43
          Corridors
33-43
          Public areas
38-43
Small auditoriums
25-30
Movie theatres
27-37
Churches
30-35
Courtrooms
33-37
Libraries
33-37
Restaurants
38-43
Light maintenance shops, industrial plant control rooms, kitchens, and laundries
43-53
Shops, garages
50-60



 
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