That sounds like plenty of ventilation!!
Make sure that its not "to" much as in killing your temps (if your room is very cold, etc..)

Everything sounds on the up and up, though.

When the fattie goes into shed, you might have to give a larger water bowl or actually mist the enclosure a bit, though, so that you actually have some visible condensation.
Just make sure everything stays clean, even if moist.

Enjoy your little fattie, they are such fun snakes for sure !!!