exhausting central vacuum
They just exhaust at the unit. All of my central vacuums use bags, so their filtration is similar to other bagged vacuums. I had one bagless unit, my Beam 275c, but I converted it in to a bag unit. I guess when it comes to central vacuums, the debate for bagged and bagless is the same, but there is one extra thing to think about. The central vacuums that are true cyclonic must be vented outside, and, while there are no filters to replace, any dust that is not captured by the cyclones will go through the motor in order to be vented outside, dust going through the motor is motor failure waiting to happen. Also, these vacuums have a screen that functions as a filter that must be cleaned in order to prevent loss of airflow. Also, with bagless central vacuums that use an inverted filter such as the beam, they can claim all they want that the filter cleans itself each time the vacuum is turned off. They may shed the majority of what is vacuumed, but dust still gets inbeded in to these filters. Converting that vacuum to use bags was the best thing I could have done for it.