Abstract: The present invention relates to an airflow enhancement device for HVAC systems comprising a vent cover with a central air channel, at least one side air channel, and a passive vortex accelerator positioned within the central air channel. The passive vortex accelerator includes a cylindrical body and a plurality of stationary, tapered fins configured to induce a vortex pattern in airflow received from an HVAC duct. The vortex-accelerated airflow is directed into a surrounding environment through the central air channel, while additional airflow may be distributed laterally through side air channels. The device further includes fixed or adjustable louvers to redirect airflow vertically or laterally for improved room coverage. The modular design supports removable installation of the vortex accelerator and allows retrofit or new installations.