Any 120 or 140mm fans can be mounted to the panels using the included silicon mounts, but if there is any hardware mounted near the top or bottom of the case, you will need to use slim fans that don’t protrude past the frame, so we would recommend using ultra-slim (13-14mm) 140mm fans. For reference, here are some examples of fans that can be used –

Cryorig XT140
Prolima Ultra Vortex 14
Thermalright TY-14013