I went straight to the source, just click on this link. It's basic but thorough and should be helpful for you. Official recommendations are always a great place to start, then you can move on to push the limits further:
This will give you the arguement for negative case pressure. I'll leave it to others to give the benefits of positive case pressure. I will say this though, green stars do not mean my preferences should be yours. I went with what was best for me in the specific circumstances in that article. Weigh both options before you decide which kind of case pressure you want and how you want the flow sculpted/directed.
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