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I forgot about the relief...I know you said you don't want to add electrics, but a horton/kysor air/electric system is a very easy and reliable set up and it can be set up as a failsafe so if there is an electrical failure, the fan engages.
Isn't the idea of adding a fan switch to be able to control the fan when you want to instead of relying on the auto switch? All the ball valves and monkey motion isn't needed. Ever heard of KISS. What you want to do can be done with 2 small check valves, a tee, an air shift axle switch and maybe...
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