RDT-Products have created our own version of the Fan Tunnel. The whole idea of this item is to stop the fan blowing the air in all directions, focusing and concentrating the air flow from your 40mm fan directly to the motor and ideally forcing the ‘air flow’ to the motor cut outs to cool the motor internally.
The RDT Tunnel booster attaches to the fan and can easily be stuck to the chassis for mounting. There is a wire cut-out, that allows additional space for wires and more rotation of the can.
There are slight grooves allowing some air to flow around the motor can (releasing some pressure built up by the fan). Users have used this item up close to the motor can and also, with a 2-5mm gap.
Fan/motor not included