Weather sealing on a storage door facilitates block drafts, rain, filth, and pests from coming into the gap lower than.

https://www.scribd.com/document/1053792545/Choosing-the-Right-Garage-Door-Electric-Motor-for-Reliable-Operation-190233

Weather sealing on a storage door facilitates block drafts, rain, dust, and pests from entering the space less than.