Instruction: Generate an answer to the question by utilizing the information contained in the document.

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Question: Can you use this as a case fan, I just bought it and realized people are talking about it being used as a cpu fan.
Document: However, I wanted to move a lot of air through the case, so I figured if there was noise, that was better than overheating.I was VERY surprised (given the reviews) to find that the fans are so quiet.The one horrible thing about these fans is that the screws that come with them require A LOT of muscle. They are VERY hard to screw into the fan.Maybe this is why some people get noise, since it is so hard to screw in the screws that they don't get them all the way in and the fan shakes/vibrates.Fortunately, I used other fan screws I had and they went in with no problem.If you do use the screws that come with the fans, you might want to screw them into the fan first, then unscrew them and then mount the fans in case.
I goofed and bought this fan to mount as the second fan on my Hyper 212+ cpu cooler. Amazon lists this as a fan for that purpose but in reality this is a simple case fan. You need a PWM fan for the Hyper 212+. The fan itself is fine and works with the cooler but will not adjust speed when connected to the mobo. I have CM's PWM fan on the way now and will use this fan as an extra case fan which is what its really designed for.
In general I liked the fan. My only complain is that it doesn't do that much light as I expected. I was able to control de fan speed with an application called speedfan and I got this up to a maximum of 6,000rpm. I would recommend this fan to people that want a bit of light in there case but not to people that are going to use this only for cooling. Its good but its a 9/10 in looks and 8/10 in cooling down the case.
Measure your fans, people. Measure your fans. I'm sure this is a wonderful case fan, but won't fit in my old case without a bit of heavy modification from a drill, a hack-saw, and some window screen. I will update this when the rest of the parts come for my new computer build and actually get to use this fan. I'm sure it'll be a glowing review as Cooler Master puts out some danged good products.
I have been using this for a few months now after I noticed my cpu getting hot playing games. I added this to push air out of the case and it dropped the temperature about +10C. I use it in a case with aSapphire AMD Radeon HD 6850 PCIE Video Card (100315L)and probably would blue screen without it. It makes a bit of noise when you plug it in since it runs at full speed unless you have a secondary CPU fan plug in which case it will just match your CPU fan speed percentage.
This fan is great. I used it in conjunction with my h60 water cpu cooler. I had temps up to 65c with the single stock fan that came with it. Since I have installed this in a push pull setup I have yet to break 45c. I looked for the fan with the best price\CFM rating and this is it. My 1090t is overclocked to 4g and it idles at 32c.
I ordered this on a Sunday and it was here three days later. I used this fan to pull air out of the back of my Elite 430 and even though I've only had it for about 24 hrs, it's great! Only a few hours before it arrived, I noticed that my gpu and cpu were starting to reach high temps. After installing the fan I double checked and found that the extra air flow had brought both temps down to an acceptable level. I'm so pleased with the fan that I'll actually be buying another one.My only issue with the fan were the screws that came along with it.
So far this fan has been working great. Have been using it a long while now (5months+) I purchased it to use as a second fan on my CPU HS which is theCooler Master Hyper 212 Plus 120mm Sleeve CPU Cooler, RR-B10-212P-G1and so far runs well. Since I am not using it as a case fan I cannot specifically say how it performs there, but used as a second fan on a HS that allows for a second 120mm fan it works a treat.
It took me 2.5 hours to install the fan, mostly because I had trouble finding a screw (at first) but then had to drill a hole and use a nut and bolt. They DO NOT EVEN THREAD THE FAN MOLDING! This caused me to attempt to screw in each screw using a ton of force, ending up stripping two of them. I eventually got my drill and drilled a slightly bigger hole and used a nut and bolt to clamp it too my case. The screws they give are small and do not work very well.
Bought these fans for a newly built system that had a few open spots for intake fans. I bought these because I wanted to add a little flair to my all black case. It definitely did the trick. These look pretty cool in a dark room. Also seem to be doing the job of keeping air flowing through the system. I didn't really know what to expect with temp ranges, but I think I just had unrealistic expectations. But my system temps usually in the 80s and cpu temp is usually in low 100s.
Answer: I bought two of them, and they can be used as a case fan at the back or as a case fan at the top. Topside requeres a lager fan though but I have a Coolermaster CM690 II and it is designed to make even a smaller fan that fit.Hope this answer helpes?