Yes, they normally do dump into air, but for some reason, in this setup with lots of tiny stone dust, it sometimes just stops for no apparent reason and I have to break the pipe and manually remove the dust from the centrifuges to get it going again. What is this railcraft fake air block you speak of? I suppose I could set up a lava block to get rid of the stone dust… or I might just go to the nether and farm some blazes and make an ender trash bin finally.
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