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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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