<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">List:<div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>“Apro” has been a part of this list as long as any group I think (this list is now “adult” - more than 21 years of existence - thanks to owner Tom Miles) . Still active with all the important stove work going on globally. I recommend joining the “Apro” mailing list, if you are not yet on it. </div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>But they (this maybe written by Dean Still?) offer a unique challenge below on a very important topic.. </div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Any new ideas to pass on?</div><div class=""><br class=""></div><div class="">Ron<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Begin forwarded message:</div><br class="Apple-interchange-newline"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">"Aprovecho Research Center" <<a href="mailto:info@aprovecho.org" class="">info@aprovecho.org</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">Auto-Damper</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">July 3, 2017 at 4:05:00 PM MDT<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><a href="mailto:rongretlarson@comcast.net" class="">rongretlarson@comcast.net</a><br class=""></span></div><br class=""><div class=""><center style="font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><table cellpadding="0" cellspacing="0" style="font-family: helvetica, verdana, arial, sans-serif; text-align: left; width: 600px;" class=""><tbody class=""><tr class=""><td valign="bottom" width="400" style="font-size: 12px; padding-bottom: 5px; color: rgb(102, 102, 102); font-style: italic;" class=""><a href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=K2bGEo6_8faNRB4M4XJTDw" class=""><img alt="" height="125" src="http://aprovecho.org/wp-content/uploads/2015/11/Aprovecho-Logo.png" width="497" class=""></a></td><td valign="bottom" width="200" style="font-size: 14px; padding-bottom: 5px; text-align: right; color: rgb(102, 102, 102); font-style: italic;" class=""> </td></tr><tr class=""><td colspan="2" class=""><table border="0" cellpadding="0" cellspacing="0" style="width: 600px;" class=""><tbody class=""><tr class=""><td colspan="2" style="font-family: Verdana, Arial, Helvetica, sans-serif; color: rgb(51, 51, 51); line-height: 18px; font-size: 12px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(204, 204, 204); padding-bottom: 20px;" class=""><br class=""><div class=" flex_column_div av-zero-column-padding av_one_full first flex_column"><div class=" av-special-heading-h2 av-special-heading" style="padding-bottom: 10px;"><h2 class="av-special-heading-tag">The ARC Auto-Damper</h2><div class="special-heading-border"><div class="special-heading-inner-border"></div></div></div></div><div class=" flex_column_div av-zero-column-padding first av_one_half flex_column"><section class="av_textblock_section"><div class="avia_textblock "><p class="">Adding a chimney to a cooking stove may not decrease exposure to PM 2.5 enough to protect health. When the pot is removed from the stove top the cook can be exposed to the escaping emissions and smoke can pour into the kitchen instead of going up the chimney. ARC designers wondered if an automatic device that immediately diverts the smoke up the chimney when the pot is removed might help to reduce exposure. Andy McClean developed the working models used in the prototype stoves.</p><p class="">The auto-damper is activated when a vertical stick above the surface of the cook top is pushed down by the bottom of the pot. The weight that holds the damper closed is pushed down, the damper opens, and the hot flue gases go up to contact the bottom of the pot. When the pot is removed a weight moves the open damper, balanced on a fulcrum, back to the closed position.</p><p class="">Yes, it’s probably too complicated! We’re hoping that someone will simplify the concept and the Indoor Air Quality will be improved. Please contact us with your ideas!</p></div></section></div><div class=""><br class="webkit-block-placeholder"></div><div class=" flex_column_div av-zero-column-padding av_one_half flex_column"><div class=""><br class="webkit-block-placeholder"></div><div class=" avia-image-container avia-align-center av-styling-"><div class="avia-image-container-inner"><img alt="" class=" avia_image" src="http://aprovecho.org/wp-content/uploads/2017/07/gas-flow-auto-damper.png" title="gas flow auto damper"></div></div><br class=""><section class="av_textblock_section"><div class="avia_textblock "><p class=""><em class="">Cut away views of the auto damper. The drawings on the left side show the flow path of the exhaust. The drawings on the right show the linkages that move the auto-damper up and down.<br class=""></em></p></div></section><div class=""><br class="webkit-block-placeholder"></div></div><p class="">The post<span class="Apple-converted-space"> </span><a href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=Gzm8BxPonavsR8Yo6boBsw" rel="nofollow" class="">Auto-Damper</a><span class="Apple-converted-space"> </span>appeared first on<span class="Apple-converted-space"> </span><a href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=zJCBuONn3gEafRr8qdUOOQ" rel="nofollow" class="">Aprovecho</a>.</p></td></tr></tbody></table><br class=""><br class=""><p class=""><strong class="">About ARC</strong></p><p style="text-align: left;" class=""><a href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=zJCBuONn3gEafRr8qdUOOQ" class="">Aprovecho Research Center</a><span class="Apple-converted-space"> </span>(ARC) is a non-profit organization dedicated to solving the problems of indoor air pollution and fuel scarcity in developing countries related to preparing food on biomass cook stoves. ARC has been helping people with stove design and testing since 1976, and since 2007 has helped to create Regional Testing and Knowledge Centers (<a class="validating" href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=A9rkkvexzKC59h4_PiecMQ" target="_blank">RTKC</a>) with its <a href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=_NOa2KQhLzRZh6VHAOa3KA" class="">emissions equipment</a><span class="Apple-converted-space"> </span>and<span class="Apple-converted-space"> </span><a href="mailto:mike@aprovecho.org?subject=I'd%20like%20more%20information%20about%20your%20training%20programs&body=Hi%20Mike%2C%0A%0AI%20just%20read%20your%20newsletter.%20I'd%20like%20more%20information%20about%20your%20training%20programs.%20I'm%20interested%20in%20learning%20how%20to%20do%20lab%20and%20field%20stove%20testing%20and%20stove%20design.%20Thanks." class="">training programs</a>.</p><p style="text-align: left;" class="">ARC's work is supported through the sale of its emissions equipment, testing, training, and design services, through the sale of <a class="validating" href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=EWj3u5EUdUzREEUklGiVQA" target="_blank">StoveTec</a> products, and by donations. Donations help to cover costs between sales and free the staff to pursue topics that are pertinent to ARC's <a class="validating" href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=.Q_hKTLHzVFogIFesxbBMw" target="_blank">mission</a>. Some of those topics include developing the testing standards that make stove evaluations repeatable and accurate, learning the<span class="Apple-converted-space"> </span><a class="validating" href="http://clicks.aweber.com/y/ct/?l=NUFjA&m=gm.MSaBAgZwbCjE&b=Tql5LT_owGho4ECPOIIj0g" target="_blank">design principles</a> of stoves so that anybody can make an improved stove, and providing subsidized consultation services.</p><p style="text-align: left;" class="">Aprovecho Research Center is 501(c)(3) non-profit organization. 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