For 2 weeks or so, we'll host some friends from out of state, and she's allergic to dogs. We've been planning on getting an air purifier for a while now anyhow, so we were thinking to buy one that works for pet dander and hair too with this occasion. I've got my eyes settled on a few options, but I'm just wondering if these actually work for allergic people, do any of you know? Obviously, I've found only hype online for them, manufacturers and websites stating that they work and allergies are basically gone, but while I do trust the systems work up to a point, can't say that I'm 100% sold on the fact that something as fine as pet hair or dander gets eliminated from the air 100%.