A system according to the principles of the present disclosure includes a variance determination module and a fault detection module. The built-in antenna module disposed on the PCB transmits the wireless signal and the input terminal hub coupled with the PCB connects the computer. The fan guard includes a frame and a cover covering and fastened to the frame. The first valve chamber is communicated with an inlet channel, the second valve chamber has a valve seat corresponding to the valve member, and the valve seat divides the chamber into a bottom valve chamber communicating with the first valve chamber through a communication hole formed in the first diaphragm and a top valve chamber communicating with an outlet channel. The material constant, an internal contact angle, a ratio of high and low energy pores, and an external contact angle can be calculated for the diffusion media and compared to a predetermined standard to evaluate the quality of the diffusion media. Numerous other aspects are provided.