We havw issue with oak pollen. 
Everytime open the patio door, it will come in. 
The first floor space is 1,100 sq ft. So it fit right in for Breath smart capacity. For effectiveness to clean the air, I woul rate it 5 stars. I still do not know about the life of machine or filter itself. I will re-rate it again after 1 year so it will be good enough time to rate somting for household equipment.