The average noise level of comparable spec data projectors that have been around for around the same time as this multimedia projector is 36dB, and the noise levels range from 28dB to 49dB. At only 30 decibels, the NEC M302 has a quite quiet noise level compared to most of the other similar spec multimedia projectors that have been available for a comparable time to this multimedia projector.
It may also be worth considering one of the alternative 30dB noise level projectors currently available including the NEC L102 (£621.73) which is cheaper.
Projectors with a louder noise level that might be worth looking at include the DH1017 (£804) (28dB), or the EH500 (£932.12) (30dB) both from Optoma.
What does "noise level" mean?