The Benq MW853 has a fairly quiet noise level (only 33 decibels) compared to most of the other data projectors of a comparable age and spec to this projector. 10000:1 contrast ratio projectors that came out around the same time as this data projector have noise levels of between 28dB and 49dB, and the average noise level is 36dB.
There are a number of alternative 33dB noise level projectors currently available that you might want to consider including because of its better review score, the Acer K335 (£609.97).
Projectors with a louder noise level that might be worth considering include the IN134 (£790.68) (33dB), or the IN8606HD (£499.96) (33dB) both from Infocus.
What does "noise level" mean?