@2b562a3e@5756e48c Sacrificial tower might work. I might also look into whether my fan ducting is suboptimal - I suspect it is, but CFD modelling isn't something I know how to do yet.
@20ffb98d@5756e48c My rule of thumb is that if there's a real duct (vs mounting the 5015s so the exit basically points the right way, possibly with the need for a single easy curve that doesn't reduce cross section significantly), it's very suboptimal.