12 Pcs 80mm PVC Black PC Cooler Fan Dust Filter Dustproof Case Cover Computer Mesh

Perfect fit, good air flow.

Very tiny holes. I purchased this to provide fresh air to a grow chamber, but not allow humidification to escape. Seems to keep the moisture in the chamber. The product seems to come with a very smooth side, that's the side I place in the chamber. Works well.

Used this to make lenses for a Spider-Man cosplay and I have to say It works very well for what I need it for. Just don't paint it with too heavy of a coat and the paint won't clog the holes.

100% would recommend for all computers. I have 2 dogs in my house and there is dog fur everywhere, I have these mounted on the outside of my case on the side panel with the fans as an intake for the PC. Its been about 2 months since I installed them and the inside of my computer is so much cleaner and I dont see any build up of dust yet.I will note that as they are mounted on the outside I can see what gets trapped by these things. I can pull off a hair/dustball that is bigger than a quarter almost daily. My biggest concern what the size of the holes I was afrad they would be too big to be effective. The holes are needle size pinholes very tiny and any air loss is negligible for cooling.

Easy install they are plastic so you can cut them with scissors if you need to maybe as a retrofit or custom fit holes are pre-punched and since they're plastic easy wipe down they're flexible don't have to worry about paint chipping or anything like that

Very fine micro technology.Protects system very well against dust.I will definitely use these on all my intake fans where a similar filter is not available

Love the screw hole knockouts, these fit the 140mm fan configuration perfectly. They're sturdy and provide good airflow but stop fine dust particles. They're PVC plastic so they're washable, but for the price, it doesn't hurt to throw away and replace.Seller shipped immediately, the product arrived sooner than expected, in perfect condition.Highly recommended!

I purchased the ThreeBulls 12 Pcs 120mm PVC Black PC Cooler Fan Dust Filters. Decent dust filters. They are better than nothing. These are perforated plastic. Essentially you have a nice smooth side and the other side is slightly rougher (from being perforated I guess). You still get decent air flow but its certainly not the best. I had no issues with temperature but there are other factors at work there in custom rigs. I simply wanted a quick dust filter and these fit the bill. If the dust on them gets too bad or doesn't clean off right then you can just throw them out and grab another.These have pre-perforated holes for the screws. I found that these are lined up pretty good for simple installations but I had a couple times where I needed to match the holes for custom installation. These filters are on the brittle side so care is needed for cutting and drilling if need be. In the end I used a Dremel to modify the screens as I needed for special situations.I don't mind working through these 12 filters to build PC's for someone else.. because the filters do work and are better than nothing... but I think I would spend a little more on my own rig's filters because these are not really what I had hoped for when I purchased them originally.