I have two of these, one in the window with home A/C filter taper to back and one on the floor also with home A/C filter taped to back. Even with the filters they blow air very satisfactorily. When they get dusty the covers come off easy with the screws, clean them, and easy put back together. I use the window one constantly for a $46 month electricity bill savings until outside temps get 80-85 degrees then it's A/C time, it's the middle of May before I have to switch to A/C it's 2 years old, they last very well. The feet come off easy though, maybe some superglue when putting them on.