Hitachi says the LP-WU3500 operates at a much lower noise level than other projectors thus they are aiming it for use in a classrooms, conference rooms, art galleries, museums and digital signage. The dust resistant structure applied to the optical engine reduces the effect of dust and particles in the air and enables the projector to be used in an array of environments without overheating and creating unnecessary noise.
Here are the details: www.hitachi-america.us/projectors