Thanks for your comment to let us know your puzzles.We're deeply sorry for the great inconvenience caused to you.
But we highly appreciate your kind understanding that the air flow is not the decisive factor for a good performance.
There are many factors for the actual performance:
1) filtration system
2) the pollution degree of surrounding air
3) room size & layout
4) whether the windows and doors are closed or not when using the air purifier
5) personal demand for air quality
Among these factors, the filtration system is the most important one.