1, "Nine Planets Regulate Air"
Red "auspicious position", yellow "middle position", blue "second position" (also called fierce position) and gray "Huang Wu fierce position".
2. "Eight Diagrams and Eight Mountain Palms" turned into hexagrams, and the "fierce position" was "due south, northwest, due west and southwest". These four people can install toilets.
3, the shape of the home: the tiger back hand (northwest) can install the toilet.
Based on the results of air conditioning in three hospitals, the most suitable location for installing toilets is northwest.