Hyper 48 is equipped with a 92 mm x 92 mm x 25 mm fan. Larger fan will result to larger amount of air moved than with a smaller fan with same RPMs. So it makes sense to replace a regular 80x80 fan with this 92x92 version and drop the speed of the fan in the process. This will give the same amount of air on larger surface and as a bonus, noise will be a lot lower. Fan grill is made out of metal and is painted black. This kind of regular wire fan grill will give good performance without restricting the movement of air.
I'm not sure what comes to your mind when you see that the fan is manufactured by Delta. I've always concidered Delta as a manufacturer of powerfull but noisy fans. Why would Cooler Master want to use Delta's product on cooler that is supposed to be silent? The specs of the fan tells us that it will be running with ~1400 RPM and that the noise level should be around 18.5 dB. If these numbers are correct, the end result should please everyone's ears. We'll see (hear) how it tested out in real life in a short while.
One interesting design feature cought my eye. The fan blade edges were formed so that the top edge were longer than the bottom edge. Cooler Master states this in their press release: "The unique shape of the fan blade provides 20% more airflow than the standard 80X80X25mm fan, and creates rapid air to move the heat away." Shouldn't that number be compared to another 92x92 fan instead of 80x80 fan? Well anyway, the shape is different but it is hard to say what it really does to the air flow in real life. Specs state that the amount of air moving is 28.1 CFM (Cubic Feet per Minute).
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