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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Matthieu,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> These “test holes” are not uncommon and usually plugged with a rubber stopper. My question is why 3/8” when ¼” is sufficient to allow the anemometer probe
through. If you can plan it up front, you can strategically place these test holes where a toxic gas sniffer will reside and simply pull the tube when it’s certification time. There are a lot of different tricky pass through fittings on the market which fasten
via a couple of “zip” screws and have a push on or feed through fitting for the tube. I would emphasize that if the exhaust duct is for a gas cabinet or VMB, the toxic gas detection point should be in the furthest point
<i>upstream. </i>By placing it there, you will avoid tripping the alarms when using the venturi for cylinder changes or any other activities that may result in a controlled release within the cabinet. I will respectfully refrain from explaining how I know this
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">J</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">. Of course the venturi exhaust should be located at least 16” downstream of the detection. Again,
this is a standard procedure and necessary for balancing the exhaust.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Steve Paolini<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Equipment Dood<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Harvard University Center for Nanoscale systems.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Matthieu Nannini, Dr.<br>
<b>Sent:</b> Wednesday, December 17, 2014 1:49 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Reading ventilation/exhaust<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Colleagues, <o:p></o:p></p>
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<p class="MsoNormal">First, thank you for the handful of information about bending coax tubing. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Now, facilities services here at McGill want to assess our ventilation/exhaust capacity. To measure exhaust they want to drill 3/8'' holes into each duct leading to a tool, take a reading and plug it back. They show me the plugs they want
to use and I’m not convinced at all especially for the gas cabinet exhaust. They don’t want to un-connect the tool and measure directly as they want to make its resistance is taken into account. <o:p></o:p></p>
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<p class="MsoNormal">Any body has experience regarding that matter ?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks in advance<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Matthieu<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif";color:black">-----------------------------------
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif";color:black">Matthieu Nannini<br>
McGill Nanotools Microfab<br>
Manager<br>
t: 514 398 3310<br>
c: 514 758 3311<br>
f: 514 398 8434<br>
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__mnm.physics.mcgill.ca_&d=AwMF-g&c=WO-RGvefibhHBZq3fL85hQ&r=-H4Z_jeDfTYjnKPXor15vLwzBllmg8gFrb9m_k9OGks&m=b167_gUuITIuRKaJ8_g4hU8M99PoLfjB0Pw7u8DAY5w&s=R5IpKUK3an5llZLMbh6aIGtpBk9cIrNyq8m7J5g7TEc&e="><font color="red"><b>The MTL Mail Server has detected a possible fraud attempt from "urldefense.proofpoint.com" claiming to be</b></font> http://mnm.physics.mcgill.ca/</a><br>
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