Because of the noise, I keep my vacuumm pump in another room--two rooms away, in a closet inside on a homemade insulated box (with a vent so that heat does not build up). No sound at all in the darkroom, and the pump barely can be heard in the room it is in.
Michael A, Smith
Mine is in another room - very quiet. You cannot hear Michael's at all! I thought he had it in the dungeon.