Do all central vacuums have to be vented outside?
No, however we would recommended it if possible. When using a cyclonic style central vacuum you MUST vent to the outside, other filtrations are optional. If asthma and/or allergies are a concern you should definitely vent your unit to the outside to guarantee no harmful air returns to the living area. If you cannot vent to the outside, or simply wish not to, we highly recommend using an exhaust filter.
