These things are great!
580361
I have these filters on the back of 3, 20-inch box fans that I leave running on medium speed all the time.  One fan is in a room in which we use computers that also has a cat litter box in it.  I haven't found a dustless cat litter yet (despite the advertisements to the contrary), and I hate seeing and feeling the fine dust from cat litter on my computer keyboards. Even worse, I hate to think of it in my lungs.  I have used a box fan running on medium beside the litter box for years, buying disposable filters until I purchased these.  I was worried that my cats wouldn't use the box with the fan running beside it, but, thankfully, they could care less.  This washable air filter on the fan beside the litter box immediately showed evidence of collecting litter dust.  I didn't use the velcro tabs to hold the fan in place so I could revolve the filter a quarter turn four times a week.  The outside border of the filter where most of the dust collects gets really dirty, so I move the focus to the next side.  Then I vacuum the filter once a week.  The filter works superbly at collecting cat litter dust. It collects so much dust that I shudder to think of that stuff circulating in the room and throughout the house via my HVAC system.

I have 2, 20-inch box fans running all the time in my basement, along with a dehumidifier. The fans/filters keep the basement air clean and move the air to the dehumidifier.  Again, before I got this filter, I was using disposable filters on the backs of the fans.  The air circulates all around the basement thanks to the two strategically placed fans.  I have placed one fan directly in front of the end of my dryer vent hose (we don't have access to an outside vent).  That filter I revolve a quarter turn every time I dry a load of clothes, because each load of clothes expels enough lint to make the quarter of the filter the vent is aimed at very dirty.  I vacuum this fan after drying 4 loads because all four sides are very dirty.  Using the fan to collect my dryer lint has prevented me from having to vacuuming the laundry area so often.  This filter works extremely well. I feel like I have saved a lot of money on disposable filters and am glad I don't have to rely on them any more.  I highly recommend this filter!

I am so glad I bought these three filters!  I guess at some point I will have to actually wash them so I don't feel slovenly, but so far, it looks to me like the vacuuming is getting them clean.  I do vacuum them very thoroughly and they look just like new.
2392991
Bought two. Should have bought two more. These things are awesome!
3941035
They are great! Quite the conversation piece! Everyone seems to enjoy them! They work great! Sturdy and look nice. Enjoy!
631491
These things are AWESOME! We have had these things for years and love how easy they are to use. As a matter of fact we are giving these as Christmas gifts this year.
620046
Fantastic Buy!  Love them; I plan on getting more soon!
1603923
They work great!  Much better than the ones we were using.
3314215
Finally no more cutting to fit! These things are great!
3535279
They're even better than I expected!  LOVE THEM!
1079883
These things are awesome. Great quality, look good, feel good, and work extremely well. The cat seems to leave them alone too (she likes to chew on thinner wires). I've made a couple orders of these and will almost certainly get more down the road.
1713384
I love these things! Very sturdy and hold up well to use and cleaning!
2433339
These are awesome!  The look great and work great!  I haven't used them long (just since Christmas) but they appear they will last!
869845
These are great!  The fact that they are taller makes them very easy to use.
4752358
We love these!  Once you get used to them, you can't do without!!
4734491
These worked very well!  I have had them before.
3190847
These are so awesome I ordered another set!
4026323
Great item!  These work perfectly,  and the price is right!
3315620
these are awesome, they work wonderfully, :)