Plug-and-Play Cooling Upgrade - Ready-to-use ventilation optimization with a thoughtfully designed hook concept that enables immediate performance improvement. Combines simplicity with effective function. Space-Saving Mobility - Compact, portable design for easy storage and transport. Requires minimal space in pockets, backpacks, or car trunks. Flexible Mounting Options - Secure attachment with adjustable hooks compatible with round, square, and lattice fans. Provides wide airflow while maintaining constant stability. Double-Sealed Protection - Innovative double sealing prevents leaks during up to six hours of cooling operation. Clear viewing window allows simple monitoring of cooling performance. Use scenarios - In a vehicle: attach to a compatible fan to improve airflow in the cabin during long trips without adding bulk. - At a desk or workstation: upgrade a small desk fan to distribute air more evenly while occupying little space. - In a workshop or small enclosure: provide reliable cooling for electronics or equipment by mounting to different fan types (round, square, lattice) and maintaining a stable airflow over extended periods.