Normal
That is correct, 25mm thick fans will interfere with the nuts and bolts used to attach the HiFi style feet. But 15mm fans will be fine, they will clear the nut and bolts, so yes it is possible to fit 4x 80x15mm fans and HiFi Feet.
That is correct, 25mm thick fans will interfere with the nuts and bolts used to attach the HiFi style feet.
But 15mm fans will be fine, they will clear the nut and bolts, so yes it is possible to fit 4x 80x15mm fans and HiFi Feet.