Adapting DC to PVC (and other questions)

I kinda do the same on mine Rennie, except I'm using a 22.5* or 45* at the bottom of my stack, then about a 2' section of 4" to get to the DC. It's worked fine, but like Glenn there is probably some loss of efficiency that just didn't let me get all the way over to my CNC table, where the extra 12' of run and elbows added up to too much loss. So I simply just run a shop vac on it. It's one area of efficiency to consider if you're the system isn't pulling as much as you like when it's done.
I was able to switch things around a bit to use 2 45's instead of 2 90's on the inlet side of the deputy but no such luck on the connection between the fan and the deputy.

I'm maintaining a 6" trunk across the whole shop in hopes that helps and the table saw and jointer are very close to the DC. I moved the least DC dependent tools to the far side of the shop.
 
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