Noise levels?

I have a designer coming in who wants to use 10 Series 2 Lustrs,  given that we are in a concert hall there is some concern about noise levels of the fans.  I have been unable to find any information in the documentation for the units and also have no personal experience with them to use as a guide.  I have informed the presenting company that they may or may not find the noise level unacceptable, but would like to pass on to them noise ratings at quiet and full fan speeds.  Also as far as I can tell there is no option to run  the units without any fan, is that correct?