1:  Supply Air From Indoor Unit 
2:  Return Air To Indoor Unit 
3:   Air Filter (s) 
4:   Electrical Box 
5:   Condensate Drain Hose 
6:   Inter-connecting refrigerant piping lines and electrical cables  
between outdoor and indoor units. 
7:  Wired Room Controller ( Standard ) 
8:    Display & Receiver Panel for optional wireless remote control