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    <div class="moz-cite-prefix">Hi Eli,<br>
      <br>
      thats of course not an off-topic question here,<br>
      but maybe you find more people who knows what you're talkin about,<br>
      or 'bin there done that', if you visit the next Yahoo group<br>
      you may find all answers on questions about solar air heating and
      more:<br>
      <a class="moz-txt-link-freetext" href="http://tech.groups.yahoo.com/group/SolarHeat/">http://tech.groups.yahoo.com/group/SolarHeat/</a><br>
      <br>
      Grts<br>
      Bruno M.<br>
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
      Op 19/09/2013 1:05, conservation architect schreef:<br>
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                <div><font face="Times New Roman" size="4">Can any on
                    the list recommend a through the wall power vent to
                    achieve active flow in air heater.    If not
                    satisfied with the production, I will remove and
                    reuse the materials.  I would like it to activate
                    when 80F is achieved that reduces the outward heat
                    losses of increasing to 90F before passive flaps can
                    work. Motorized damper for return air may also be
                    useful.  </font></div>
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                <div><font face="Times New Roman"><font
                      style="FONT-SIZE: 13.6pt">I am putting plastic
                      over the parts of the South wall that are not
                      windows.  Because I live on a steep hill in a
                      wooded site, I am not sure about the reduction in
                      solar available.   However, from my South windows,
                      I know that I feel that warmth.  I am framing such
                      that if it proves affective, I can replace plastic
                      with permanent glass when plastic wears out. If it
                      proves not adequately productive, I will
                      dis-assemble materials to repurpose.  </font></font></div>
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                <div><font face="Times New Roman" size="4">Thanks Eli </font></div>
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