Free images results:
 

Exit pictures, stock photos and images

 
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Blue Door Royalty Free Stock Photos
Author: Barsik
Old Door Stock Photo
Author: Judwick
Gate Royalty Free Stock Images
Author: Michaf
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Exit Stock Photos
Author: Ollirg
Exit Sign Royalty Free Stock Photo
Author: Prawny