Hi everyone, We have a central vacuum cleaner, probably from the 1990s. The unit is located in our basement. The cannister has 2 vents, one for the air/dirt being sucked into the cannister, and another vent to exhaust it. Only the intake vent has PVC pipe connected to it. The exhaust does not have any PVC pipe. The central vac was already installed in the house when we bought it. Unknowingly, we've been running the central vac for the past 8 years without the exhaust vent being vented to the outside. Do we really need to connect a PVC pipe and vent it to the outside? I don't notice any dust or dirt, but I'm thinking small micron particles could be coming out of the exhaust vent. For those who have central vacuums, is yours vented to the outside?