What are the best practices for bay doors that open from a processing area to the outside?

Hello, 

 

What are the best practices for bay doors that open from a processing area to the outside? I have worked in facilities that have a two door system: a forklift opens one door, moves into the space between the doors, closes door one, then opens door two and goes outside). Is there a better way that maintains the integrity of the processing area? Would a quick open door with an air curtain be sufficient? 

 

Thank you!

 

 

Best I have seen is an annex door where the door opens to a visuble area similar to a half a trailer load size extension.