[Rtrorkt]

Originally Posted by A930Rocket

That was my understanding. The door had to be 75% of the wall and self closing.

Now we just need to determine the wall thickness and door jamb.

i am doubting the door is 75% of the wall. There will be an opening limit in the wall given the construction type. Yes, with closer. Wall thickness in a rated situation is most likely 3 5/8" metal studs with 2 layers of 5/8" drywall both sides

from Ceco

https://www.cecodoor.com/en/site/cecodoor/products/standard-fire-doors/steel-stiffened-core-doors/

And hardware
https://www.yalecommercial.com/en/yale/yalecommercialcom/site-functions/search/?searchquery=fire+rated

typical wall assembly, non-load bearing interior partition

USG Design Studio | UL U404 Configuration A - Fire Resistant Assembly, Fire Rated Assembly, Fire Rated Detail