This is a small DC brushless fan, ideal for keeping the stepper drivers on a GAUPS cool. It is 50 mm square, 10 mm thick, and rated 12 V 100 mA. It has a 170 mm cable with a two-pin, 0.1" pitch connector. It mounts with four 4 mm diameter holes at 40 mm centres. You can run one or more of them off your 24 V motor supply by using our small DC-DC converter (if using 36 V for the motors, select our large DC-DC converter).
We also have screws and a matching fan guard for it.