Noise Levels - Airclean

Below are details of the noise pressure levels across the spectrum for some NR noise ratings.

NRLEVEL	31.5Hz	63Hz	125Hz	250Hz	500Hz	1000Hz	2000Hz	4000Hz	8000Hz	Typical Applications
NR45	86	71	61	54	48	45	42	40	38	Restaurant
NR40	83	67	57	49	44	40	36	35	33	General Office
NR35	79	63	52	45	39	35	32	30	28	Private Offices
NR30	76	59	48	40	34	30	27	25	23	Cinemas
NR25	72	55	44	35	29	25	22	20	18	Concert Halls
NR20	69	51	39	31	24	20	17	14	13	Broadcasting and Recording studios
NR15	66	47	35	26	19	15	12	9	7	Audio Labs