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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi All,
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<div>At the moment we're trying to decide the purity / source of the nitrogen we will use to vent our tools. The building has a bulk nitrogen system that is plumbed to the clean room in copper pipes. Our clean room contractor believes that that nitrogen might
be too dirty to use as a vent gas and recommends ultra pure nitrogen. I am wondering if anyone has thoughts on this matter. I believe that it is possible to get 99.998 % N2 out of copper pipes. Is that the case? If not are there purifiers / dryers that are
commonly used? This is only a vent gas and not a process gas. </div>
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<div>Any wisdom in this matter will be highly appreciated.</div>
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<div>Best,</div>
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<div>milan</div>
<div>Technical Cleanroom Manager</div>
<div>CUNY Advanced Science Research Center</div>
<div>Milan.Begliarbekov@asrc.cuny.edu</div>
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