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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