What is Room size in square metres?

Room coverage, in square metres, shows how much floor area a purifier is rated to clean. A bigger number suits an open-plan living room, while a smaller one is fine for a bedroom or a study. Air Health lists 297.29. AirDoctor Europe quotes a range of 113 to 225, which tells you it covers rooms of quite different sizes. Airtheeral states 185 and Alen Air Purifiers 260.13, so match the figure to your own floor area before you buy.