Originally Posted by Clipper
All Airbus single isle aircraft have the same forward and aft main entry doors, A318, 319, and 320 have the same overwing doors(different quantities). The A321 have two extra set of large type I doors just forward and Aft of the wing.
The 1.5 inch contrasting color strip around the exits is an FAA requirement applied only to transport category, commercially operated aircraft, all IATA member countries adapted the same regulation sometime in the late 60 - early 70's. This contrast color border suppose to help emergency rescue personnel find the entrance from the outside.