I remove all eggs to a still air incubator for hatching and have never had a stuck chick.
Humidity will increase alot when chicks start to hatch from respiration.
Make sure you have any plugs open, it will help air circulate.
If you think they will get caught up in it then yes its best to turn it off.
Just keep an eye on your temps as they can fluctuate after you turn off the fan.
Good luck on your hatch.