Vent stack pressure

Could anyone explain to me in easy to understand terms the difference between positive vent stack pressure and nonpositive vent stack pressure?

First, welcome to our forum, Darrell!

Second, this may help you with your question:

blowing vs sucking or pushing vs pulling :slight_smile:

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Wow ! That sounds like fun… :smiling_face_with_three_hearts:

Thanks Larry ,that helped me understand a little better.

Welcome, Darrell. I’m glad it helped. :smile: