I did this review sitting about 4 feet behind the projector. While reviewing content with the sound coming through the built in speaker, I couldn't hear the projector fan running. If the sound was turned down or off I could hear the projector’s fan but it was actually relatively quiet. Maxell doesn’t provide a decibel rating for noise in the documentation I have, so here is my unscientific assessment.
A slight fan noise can be heard but wasn't noticeable when video was being played. When it comes to being placed in a conference room or a classroom it's just not going to be a problem regardless of placement, unless it's in your lap. Bottom line, this projector is quiet and, in my opinion, not going to be an issue for your customers or their students and/or meeting attendees.
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