That's a fan simulator, are you planning on removing the 4 fans and just count on the external inline fan to cool the miner? seems like a good idea but the problem with this approach would be the possibility of over-cooling the miner when not needed, if the room temp is low the miner's software will lower the fan speed, you can't do that with an external fan, unless you get a smart fan which you can control with a temp sensor attached to the miner.