Illustrator exporting large banner at incorrect size
I am trying to export two 20ft wide x 4ft tall banners for a festival. Illustrator won't export the files as the correct size! It is exporting them very very small and will look extremely fuzzy when printed.
I have one other banner 10ft wide x 4ft tall that I will also need to export. I haven't tried yet but I imagine I'll just run into the same issue.
These files were created by someone else a year ago, I was just uploading some of the information on them. Obviously these files were used to successfully create and print these banners in the past. I do not understand how to make them work now.
Please help, I need to order these banners today. How can I export them as the correct side?

