CX2500 has an internal fan. The unit is mounted in the ceiling.
Ionization, Ozone and VOC levels, Humidity and Air flow all are independently controlled from a wall mounted box with LCD display (Remote Control).  

CX90V-E2-IC and CX120V-E3-IC and CX300V-F3-IC unit is mounted in the walls and Ceiling . The room volume in square meters m2 indicates the approximate room size this unit can handle,

CX120V-E3-OVC and CX300V-F3-OVC unit is mounted in the walls and Ceiling . The room volume in square meters m2 indicates the approximate room size this unit can handle,based on a room height of about 3 meters. This may vary with air quality and humidity.