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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