With the subject invention, a pump may be formed that generally includes a reservoir formed to accommodate at least one fluid dose, and a fluid-collecting chamber in communication with the reservoir. The system encompasses the prior art and new user specific mass media. The socket is formed with four bores of different cross sections. Whether the voltage output to the load is normal is determined, if the voltage output to the load is low, the pulse skipping mode is stayed for a number of clock cycles; the voltage output to the load is detected to determine whether the voltage is normal. A method of forming a cabinet for an air handling unit is further included.