We have 2 cats, 2 dogs, and our oldest son has asthma. He got the diagnosis almost a year ago. Since then, we have been using these filters to better the air in our home. With all the animals, and living in Georgia where pollen rules the spring, we have noticed way less animal hair, dirt and pollen in our home. We change them every 30 days, and they definitely filter a lot of crap out of the air. For areas high in pollen, or dust if you are in the desert, or if you have animals, I highly recommend these filters. Minimal dusting of furniture.l, and you can't even tell we have animals! Plus, the best part, my son breaths better.
Have been buying filters for YEARS 16 x 20, when I really need 18 x 20 - these fit nicely (much better) and will see how well they work when I change it a month - came quickly, so that was nice
I'm using this to filter the air on my console humidifier. I waned to find a filter that was just the right size so I could slip it into a channel instead of taping it or attaching it with velcro. They were one of the few places that could provide this odd size.