My new flow hive top board does not have a notch for an entrance. Is it supposed to have one? I am new to this game.
Nope. Your flowhive doesn’t come with a top entrance. Why would you want a top entrance?
Is it not necessary for ventilation?
Not at all. Bees are very good at directed fanning to create airflow around the hive in any direction they want. @JeffH has a very nice YouTube video of bees in his observation hive doing exactly this. They just line up in the same direction and push the air flow with their wing beats - very impressive!
Thanks for the information.