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If your unit has a bypass motor and is installed in a room of less than 8’ x 10’, exterior ventilation will be absolutely necessary. However, it is best, when possible, to install an exterior exhaust for your central vacuum system. This exhaust considerably decreases the central vacuum sound level and allows, if there are any tears or punctures in your bag or filters, to evacuate bacteria and mold outside. It also allows the heat, produced by the power unit’s motor(s), to be redirected outside and not in the room where your central vacuum is.