The arbor advertised a depth of 30", but the arbor I received has a depth of 20".  I would still buy it for the reasons explained in the headline, but the product was not correctly advertised.  Below is the response I received from Wayfair.

I apologize for the confusion on our site. The overall depth on our website refers to the longest depth on this arbor, which is the top cross beam. The side panels have a depth of 20.25". 
Please let me know if you have any other questions or concerns. Thank you for shopping with Wayfair.com. 
  
Sincerely, 
  
COURTNIE M. 
THE WAYFAIR.COM TEAM