Sort by a parameter's value

I have been watching some of the AU videos for Dynamo, and they use an example of distributing air flow to air terminals in spaces. The big problem is it distributes the Space Specified Supply Air Flow to ALL air terminals in the space, exhaust, return, and supply alike. How do I first filter the air terminals based on the system classification value so that I can only have a list of “supply air” terminals to pass along?

You might get some direction from this discussion

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