After a current value flowing through a coil L is detected, it is converted into a voltage value, is then inputted to an inverting input terminal of a comparator 4, and is then compared with a voltage indicating the difference between the value of a fed back output voltage and a reference voltage. The method also includes generating for display a first message based on the first flow characteristic of the flow. Exemplar points in each travel segment are eliminated to define the travel segment by a beginning exemplar point and an ending exemplar point. Once configured, the boot hanger mounting bracket assembly is secured to the building structure by a securing a pair of boot hanger arms to the ceiling joists, wall studs or other support structure.