Based on this product's specifications, here are some alternatives and similar models
Cooling Fan Protective Grill Panasonic ASFN68001, 60×60 mm (B×H)
Summary description:
Protective grill for cooling fans, Panasonic model ASFN68001, sized 60 × 60 mm (width × height). Designed to prevent contact with fan blades and reduce foreign object ingress while allowing airflow. Suitable for mounting on 60 mm square axial fans in electronic enclosures, power supplies, small servers and industrial equipment where blade protection and ventilation are required.