Rizeon

50mm fans, 4pin pwm, 20+ cfm. Sub 38db. 60mm can be glued in but not ideal. (Adhesive Foam) Those are the specifications, it's a proprietary system. (Ibuypower sbx) Manufacturer will not supply replacement fans because no original receipt of sale.

so heres the deal, I am replacing a friends cpu fans but they require the following specifications 50mm X (10x20mm depth) 4pin pwm(motherboard doesnt support 3pin voltage control mode) CFM > 20 DB < 40