Weather sealing on a storage door allows block drafts, rain, airborne dirt and dust, and pests from getting into the space lower than.

https://goldcoast-qld4209-su802.lucialpiazzale.com/garage-door-tracks-and-maintenance-for-better-door-performance-in-storm-prep

Weather sealing on a storage door supports block drafts, rain, airborne dirt and dust, and pests from entering the space lower than.