The Nutone MD6TU is an 8" automatic, universal makeup air damper that comes with a pressure sensor kit. This model is constructed to provide effective ventilation for a cleaner home while equalizing pressure between outdoors and indoors. It eliminates smoke, gases or particulates which are normally generated from combustion devices like a water heater or fireplace. The Nutone MD6TU is an interlocked system that installs simply and needs only lowvoltage wiring. It is ideal for retrofit or new construction into an existing home.