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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