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<div class="moz-cite-prefix">Hi Lennart,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">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.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">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).<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">With best wishes</div>
<div class="moz-cite-prefix">Dirk<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Am 25.06.2021 um 13:31 schrieb Hawks,
Catharine:<br>
</div>
<blockquote type="cite"
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<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>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Lennart Lennuk
<a class="moz-txt-link-rfc2396E" 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 class="moz-txt-link-rfc2396E" href="mailto:HawksC@si.edu"><HawksC@si.edu></a>;
Anderson, Gretchen <a class="moz-txt-link-rfc2396E" href="mailto:AndersonG@CarnegieMNH.Org"><AndersonG@CarnegieMNH.Org></a>;
Haff, Tonya (NCMI, Crace) <a class="moz-txt-link-rfc2396E" href="mailto:Tonya.Haff@csiro.au"><Tonya.Haff@csiro.au></a>;
<a class="moz-txt-link-abbreviated" 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
style="font-size:9.0pt;color:#9C6500" lang="ET">External
Email - Exercise Caution</span></b><span lang="ET"><o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET">Hi!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET">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%?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET">Best!<br>
Lennart<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span lang="ET">From:</span></b><span
lang="ET"> Hawks, Catharine [<a
href="mailto:HawksC@si.edu" moz-do-not-send="true">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"
moz-do-not-send="true">Lennart.Lennuk@loodusmuuseum.ee</a>>;
Anderson, Gretchen <<a
href="mailto:AndersonG@CarnegieMNH.Org"
moz-do-not-send="true">AndersonG@CarnegieMNH.Org</a>>;
Haff, Tonya (NCMI, Crace) <<a
href="mailto:Tonya.Haff@csiro.au"
moz-do-not-send="true">Tonya.Haff@csiro.au</a>>;
<a href="mailto:nhcoll-l@mailman.yale.edu"
moz-do-not-send="true">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> RE: [Nhcoll-l] Humidity in collection
rooms<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="ET"><o:p> </o:p></span></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>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Nhcoll-l <<a
href="mailto:nhcoll-l-bounces@mailman.yale.edu"
moz-do-not-send="true">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"
moz-do-not-send="true">AndersonG@CarnegieMNH.Org</a>>;
Haff, Tonya (NCMI, Crace) <<a
href="mailto:Tonya.Haff@csiro.au"
moz-do-not-send="true">Tonya.Haff@csiro.au</a>>;
<a href="mailto:nhcoll-l@mailman.yale.edu"
moz-do-not-send="true">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
style="font-size:9.0pt;color:#9C6500" lang="ET">External
Email - Exercise Caution</span></b><span lang="ET"><o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET">Hi!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET">Why
the fluid collections ideal is 30% +/- 5%?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET">I
though it would be good to keep it 50-60% for less
evaporation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET">Best!<br>
Lennart<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ET"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span lang="ET">From:</span></b><span
lang="ET"> Nhcoll-l [<a
href="mailto:nhcoll-l-bounces@mailman.yale.edu"
moz-do-not-send="true">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"
moz-do-not-send="true">Tonya.Haff@csiro.au</a>>;
<a href="mailto:nhcoll-l@mailman.yale.edu"
moz-do-not-send="true">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> Re: [Nhcoll-l] Humidity in
collection rooms<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="ET"><o:p> </o:p></span></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>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l0 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:l0 level1 lfo3">For
fluid (ETOH etc) collections, the ideal should be much
dryer. 30% +/- 5%.
<o:p></o:p></li>
</ul>
<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"">Gretchen Anderson<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Conservator<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Carnegie
Museum of Natural History<span style="color:#C00000"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">5800
Baum Blvd. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Pittsburgh,
PA 15213<o:p></o:p></span></p>
<p class="MsoNormal"><a
href="mailto:Andersong@CarnegieMNH.org"
moz-do-not-send="true">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 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Nhcoll-l <<a
href="mailto:nhcoll-l-bounces@mailman.yale.edu"
moz-do-not-send="true">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"
moz-do-not-send="true">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"><span lang="EN-AU">Hello all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">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></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">Tonya<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="mso-fareast-language:EN-AU" lang="EN-AU">---------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-fareast-language:EN-AU" lang="EN-AU">Dr Tonya
Haff<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-fareast-language:EN-AU" lang="EN-AU">Collection
Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-fareast-language:EN-AU" lang="EN-AU">Australian
National Wildlife Collection<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-fareast-language:EN-AU" lang="EN-AU">National
Research Collections Australia, CSIRO<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-fareast-language:EN-AU" lang="EN-AU">Canberra,
Australia
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-fareast-language:EN-AU" lang="EN-AU">Phone:
(+61) 02 6242 1566 (office)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-fareast-language:EN-AU" lang="EN-AU">(+61)
0419 569 109 (mobile)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><br>
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