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Hello, Thank you for reaching out to us. All of your DVR/NVR systems will have a fan to help keep the electrical components cool. This helps with the longevity of the unit, reducing the possibilities for overheating as these systems are normally running continuously. The sounds produced by this fan is not loud and can be compared to a slight hum. Please let us know how we may further assist you, Thank you. Swann Customer Support
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