I suspect the answer here isn't "replace your dyson with a box fan and bungie cords" but - if you care about air filtration, buy a cheaper more effective one th

I suspect the answer here isn't "replace your dyson with a box fan and bungie cords" but - if you care about air filtration, buy a cheaper more effective one that looks ok. It's not surprising a 3-in-1 product isn't very good at (at least) 1 of those functions.