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David, when you get time you'll really enjoy these videos that Richard and Steve put together on the basics of our air systems along with leak detection.

https://www.youtube.com/channel/UCOX2Z7Y...ibQ/videos

Make sure you watch them in order. Depending on what device you're watching on it can be hard to find the labels for order. You should be able to see Part 1, Part 2, etc.