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Originally Posted by DrMemory
TMD fans are also supposed to reduce the "blind spot". Of course the biggest TMD fan is only 70mm.
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And horrendously expensive. And the point is not the dead spot underneath the motor, but to increase air pressure. The top fan reduces back pressure created by the bottom fan. By negating the back pressure, it effectively makes the bottom fan more powerful. Relatively low static pressure is the main problem with 120mm fans. Same CFM as smaller fans, but it doesn't have the same static pressure because the air is being moved over a larger surface area.