What size air purifier would I need?

Specifications:
UV-ASU 6000 | ||
---|---|---|
Dimensions in mm | 400 x 400 (base footprint) x 880 | |
Weight | 20Kg | |
Fans | Direct drive, rotor motor, forward curve DIDW centrifugal fan with sealed bearings | |
Power Supply (Unit provided with 2.0m flying lead only.) | 220 - 240 AC I 50 Hz / 1 phase | |
Tube replacement | 13,000 hrs maximum | |
Visual *Lamp fail* system | Included | |
Removable foam filter | 210 x 340 x 12mm | |
Optimum room size | 50-80 cu m approx. | |
Finish (visible-surface only) | White polyester gloss (RAL 9003) | |
Net Weight | 25kg |