Look online and you'll see an extreme failure rate for the internal fan.  Chances are yours is experiencing this now with a slight rattle and it will only get worse.I've purchased dozens of these for office use and Intel has never nor will ever honor their warranty, your choices are either a refund (only the unit, does not cover your out of pocket for memory, drive, operating system, etc...) or provide a list of websites where the consumer can purchase a fan out of pocket and replace.Their exact email, "Based on the information provided it seems that the fan assembly on the Intel® NUC is failing; therefore, the only option we have available to move forward will be to honor the unit’s warranty; however, based on the current availability for both the fan and the unit itself the only option we have available will be to either provide you with a refund for the whole unit or to provide you with the fan’s part #, a list of websites where you can look for it and of course the instructions to install it."For reference this would be like purchasing a vehicle where the buyer provides the engine and tires.  After 2 years the brake lights stop working and the dealer buys back the vehicle because they are too cheap to purchase the replacement parts and too ignorant to recognize their faults.  You're left with an engine that isn't compatible with newer vehicles."Thanks Intel Management, nice work denigrating a once sterling reputation.