300-600
I agree there are no stupid questions, only stupid answers.........
but a simple look in the handbook, system description ATA chapter 21, Air distribution to control cabin, and there wouldn't be such a question.
If U like I can send U a screenshoot.
And BTW, this is a Tech Forum I'm the guy how knows the plane and explains it to you guy's behind the steering
Never became a pilot, toooooooooo many switches and gauges and indications there
