I work in an old building with a dated AC system that also would drop out particles (dirt/dust) from my vent in my office.. while the company does replace the intake vent filters pretty regularly, I felt like I needed something to filter the air as it came out directly into my office. This product is perfect for that and from my searches is also very reasonably priced. It was very easy to install (it took me only a couple of minutes) and is low profile, so also not very noticeable. It may restrict more air flow than I had expected (but I’m generally colder than everyone else anyway so this hasn’t been a problem) - but it may simply be that the air is no longer directed straight for my head but rather dispersed around the room more equitably. My office co-workers all want one now!! Would definitely recommend so far! (It has been installed for about a week at the writing of the review)