The 120mm Washable Fan Filter fits between the fan hole and your intake fan to make sure only clean air gets pulled through your case. Every couple months or so, you can pull out the filter and wash it, keeping it effective.

Dimensions:	125 x 125 x 10 mm
Washable Filter:	Yes

05-11-2014
Reviewer: Mike (3)
These are nice, easy to use fan filters. I have run into a space issue though. If your fans are right on top of each other this will be difficult to use since there is an overhang.

02-06-2012
Reviewer: Stryk3r (3)
Inexpensive. Easy to work with and clean. Warning...doesnt come with screws. You use the screws that goes with the fan you are using the filter with.

12-28-2011
Reviewer: soja (3)
I bought these but standard case screws arent long enough to mount them. Going to have to make a trip to the hardware store to find longer screws.