I have never heard that idea. I would say if you are getting dusty air coming in then your cab filter is not doing it's job. They stop dust but if you drag a lot of dirt and chaff in on your boots it will dry up and re-circulate around the whole cab. Keep that outside air coming in through the filter and it helps pressurize the cab. Unless you have some major holes in the cab. (or a window open which defeats the whole purpose of a cab fan and filter anyway).
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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