This project is to show us how to implement Smart fan to be controlled remotely by mobile or web server through the internet. User can set a certain temperature degree at moble or webserver. And if the temperatue degree becomes the same with the set value, Fan will run automatically. It is implemented by Arduino Ethernet shield 2 and Arduino platform mainly. You can refer more detalied information and technical material from the below blog.
Source : http://satotoshio.net/blog/?p=1420