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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