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Local home centers sell the 5" variety, so if you are enjoying the additional cutting surface of a 6 inch, this is one of the best places to stock up. Over time, even that is a consideration. A good respirator, not a paper mask is advisable. The 180 takes it a step higher. It is actually cheaper, in addition to doing a better job. The advantage to quality paper, is that you can get in a groove with some consistency. That way you don't wind up with a buggered edge on your sander. The 6 hole paper is nice for the dust free environment.
That is about 3 for each grade. So technically you have a vac system that is actually a mini-part of a micron, invisible dust manufacturing plant. I had a body shop for 20 years, and after using the cheaper paper on the random orbit sanders, and winding up with a floor full of used paper, I can attest to the savings of using quality, aluminum oxide paper. The 100, 120, and 150 are the most frequently used.
The vacuum draw that leaks around the inlet, sucks up that last 1% of the dust coming off the paper. To tell you the truth, I rarely use the 320. When I first bought my Bosch 3727DVS, I bought a box of the popular grades; 80, 100, 120, 150, 180, 220, and 320. I just went through over 50 boards of 80+ inch cedar, in three grades, and I only used about 10 sheets all combined. Instead of having cheaper paper that gives you the new disc agressiveness, then quickly to the used paper smoothness, which may be a grade finer, and miss the deeper lines from the coarser grade of paper in the previous step. A fresh air system is even better.
It is still recommended to wear a mask because the shop vacs only capture to a micron or so. The 220 produces the glass smooth look. Additionally the backing paper is stiff enough to do the job. Highly recommended. I simply attach a 2 1/2" vac hose to the dust port on my Bosch, which is way smaller than that, so a lot of air escapes.
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