Pop door size?

[crazychickenman007]

Hi all. I have 4 week old jersey giants and have never owned them before. I know they’re supposed to be huge so I am currently modifying my coop to accommodate their larger size. How big should I make the pop door so they will comfortably be able to fit through? Also how big should I make the nesting boxes for them? Thank you!!!

 

[WIchickMama]

Our pop up door is 15"wx18"h and I have 3 Brahmas, so a larger breed and it works just fine. Only one can fit at a time so there is never any pushing or shoving, lol