oh ok, so I could put a 172mm fan(where do you even get that? I only see 120mm on new egg).
and then get a funnel joint to take it down to a smaller size. and that wouldnt just amplify the back pressure on it? thought i had to keep the piping around the same size as the fan so the pressure wasnt too high.
but this will work?
any good ideas where to get a pipe like that?
Im thinking get a bunch of PVC pipe from every size in that range. cut sections so you have "steps" to the one side, and then go in with silicone and give it a smooth inside edge thats water tight.
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