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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Thanks everyone for chiming in on this! As usual it’s a very interesting discussion, and I’ve learned a lot. We will stick at our original aim of 18C with 50% humidity. I take the point about never
turning it off!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Tonya<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu>
<b>On Behalf Of </b>Dirk Neumann<br>
<b>Sent:</b> Friday, 25 June 2021 9:55 PM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> Re: [Nhcoll-l] Humidity in collection rooms<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Lennart,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">the recommended range is between 35-55% with daily fluctuations less than 5%. The closer you get to 60% (+/- 5% fluctuation), the closer you approach the threshold for potential mould outbreaks (depends on temperature and air circulation
as well). A second think worth considering is metal corrosion, which is accelerated at a rH above 57% (and 18°C) as well.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The increased evaporation you mention likely is promoted by high air exchange rates, which basically hinders that an stable equilibrium can establish (thus the high technical need to actively control the parameters and keeping them stable
even at aggressive air exchange rates).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">With best wishes<o:p></o:p></p>
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<p class="MsoNormal">Dirk<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Am 25.06.2021 um 13:31 schrieb Hawks, Catharine:<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">I suspect that the decision would lie with whatever authority has jurisdiction in terms of fire safety for your museum.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Cathy<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b>From:</b> Lennart Lennuk <a href="mailto:Lennart.Lennuk@loodusmuuseum.ee">
<Lennart.Lennuk@loodusmuuseum.ee></a> <br>
<b>Sent:</b> Friday, June 25, 2021 7:26 AM<br>
<b>To:</b> Hawks, Catharine <a href="mailto:HawksC@si.edu"><HawksC@si.edu></a>; Anderson, Gretchen
<a href="mailto:AndersonG@CarnegieMNH.Org"><AndersonG@CarnegieMNH.Org></a>; Haff, Tonya (NCMI, Crace)
<a href="mailto:Tonya.Haff@csiro.au"><Tonya.Haff@csiro.au></a>; <a href="mailto:nhcoll-l@mailman.yale.edu">
nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> RE: [Nhcoll-l] Humidity in collection rooms<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="line-height:12.0pt;background:#FFEB9C"><b><span lang="ET" style="font-size:9.0pt;color:#9C6500">External Email - Exercise Caution</span></b><o:p></o:p></p>
<div>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D">Hi!</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D">Understandable. If the possibility for arc spark has been removed and the room has good ventilation, is it then better to keep the humidity above 50%?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D">Best!<br>
Lennart</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="ET">From:</span></b><span lang="ET"> Hawks, Catharine [<a href="mailto:HawksC@si.edu">mailto:HawksC@si.edu</a>]
<br>
<b>Sent:</b> Friday, June 25, 2021 2:17 PM<br>
<b>To:</b> Lennart Lennuk <<a href="mailto:Lennart.Lennuk@loodusmuuseum.ee">Lennart.Lennuk@loodusmuuseum.ee</a>>; Anderson, Gretchen <<a href="mailto:AndersonG@CarnegieMNH.Org">AndersonG@CarnegieMNH.Org</a>>; Haff, Tonya (NCMI, Crace) <<a href="mailto:Tonya.Haff@csiro.au">Tonya.Haff@csiro.au</a>>;
<a href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> RE: [Nhcoll-l] Humidity in collection rooms</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><span lang="ET"> </span><o:p></o:p></p>
<p class="MsoNormal">Actually, one concern for alcohol collections is that given how poorly most jars seal, there is an appreciable quantity of alcohol vapor in the space. When the RH is below 40% it is easy to arc a spark just from static electricity, so somewhere
above that usually recommended by our fire protection engineers.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Cathy<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b>From:</b> Nhcoll-l <<a href="mailto:nhcoll-l-bounces@mailman.yale.edu">nhcoll-l-bounces@mailman.yale.edu</a>>
<b>On Behalf Of </b>Lennart Lennuk<br>
<b>Sent:</b> Friday, June 25, 2021 7:11 AM<br>
<b>To:</b> Anderson, Gretchen <<a href="mailto:AndersonG@CarnegieMNH.Org">AndersonG@CarnegieMNH.Org</a>>; Haff, Tonya (NCMI, Crace) <<a href="mailto:Tonya.Haff@csiro.au">Tonya.Haff@csiro.au</a>>;
<a href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> Re: [Nhcoll-l] Humidity in collection rooms<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="line-height:12.0pt;background:#FFEB9C"><b><span lang="ET" style="font-size:9.0pt;color:#9C6500">External Email - Exercise Caution</span></b><o:p></o:p></p>
<div>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D">Hi!</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D">Why the fluid collections ideal is 30% +/- 5%?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D">I though it would be good to keep it 50-60% for less evaporation.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D">Best!<br>
Lennart</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="ET" style="color:#1F497D"> </span><o:p></o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="ET">From:</span></b><span lang="ET"> Nhcoll-l [<a href="mailto:nhcoll-l-bounces@mailman.yale.edu">mailto:nhcoll-l-bounces@mailman.yale.edu</a>]
<b>On Behalf Of </b>Anderson, Gretchen<br>
<b>Sent:</b> Thursday, June 24, 2021 5:53 PM<br>
<b>To:</b> Haff, Tonya (NCMI, Crace) <<a href="mailto:Tonya.Haff@csiro.au">Tonya.Haff@csiro.au</a>>;
<a href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> Re: [Nhcoll-l] Humidity in collection rooms</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><span lang="ET"> </span><o:p></o:p></p>
<p class="MsoNormal">Hi Tonya,<o:p></o:p></p>
<p class="MsoNormal"><br>
There is some flexibility in this, depending on the relative humidity that you can safely maintain, both physically and financially. Remember that stability is extremely important.
<o:p></o:p></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoNormal" style="mso-list:l1 level1 lfo3">For study skins, we aim for 50% +/- 10%. That allows for limited seasonal drift for those of us who live in extreme climates. – your 45% set point falls within that, and should be ok.
<o:p></o:p></li><li class="MsoNormal" style="mso-list:l1 level1 lfo3">For fluid (ETOH etc) collections, the ideal should be much dryer. 30% +/- 5%.
<o:p></o:p></li></ol>
<p class="MsoNormal"><br>
Good Luck. <br>
Gretchen Anderson<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Script MT Bold",serif">Gretchen Anderson</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Conservator</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Carnegie Museum of Natural History</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">5800 Baum Blvd. </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Pittsburgh, PA 15213</span><o:p></o:p></p>
<p class="MsoNormal"><a href="mailto:Andersong@CarnegieMNH.org">Andersong@CarnegieMNH.org</a><o:p></o:p></p>
<p class="MsoNormal">(412)665-2607<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b>From:</b> Nhcoll-l <<a href="mailto:nhcoll-l-bounces@mailman.yale.edu">nhcoll-l-bounces@mailman.yale.edu</a>>
<b>On Behalf Of </b>Haff, Tonya (NCMI, Crace)<br>
<b>Sent:</b> Wednesday, June 23, 2021 9:14 PM<br>
<b>To:</b> <a href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> [Nhcoll-l] Humidity in collection rooms<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Hello all,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am hoping that some of you can give me feedback on the relative humidity set point that is best for collection vaults with study skins, and for ETOH vaults. Right now we are planning on a 45% relative humidity in the study skin vaults,
and 50% in the ETOH vault, but I wonder if 45% might be a bit dry for study skins? I would be grateful for any feedback!<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Tonya<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">---------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal">Dr Tonya Haff<o:p></o:p></p>
<p class="MsoNormal">Collection Manager<o:p></o:p></p>
<p class="MsoNormal">Australian National Wildlife Collection<o:p></o:p></p>
<p class="MsoNormal">National Research Collections Australia, CSIRO<o:p></o:p></p>
<p class="MsoNormal">Canberra, Australia <o:p></o:p></p>
<p class="MsoNormal">Phone: (+61) 02 6242 1566 (office)<o:p></o:p></p>
<p class="MsoNormal">(+61) 0419 569 109 (mobile)<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman ,serif",serif"><br>
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---------<br>
<br>
Dirk Neumann<br>
<br>
Tel: +49-89-8107-111<br>
Fax: +49-89-8107-300<br>
neumann(a)snsb.de<br>
<br>
postal address:<br>
<br>
Bavarian Natural History Collections<br>
The Bavarian State Collection of Zoology<br>
Dirk Neumann, Section Ichthyology / DNA-Storage<br>
Muenchhausenstr. 21<br>
81247 Munich (Germany)<br>
<br>
Visit our section at:<br>
<a href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a><o:p></o:p></p>
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