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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We have operable skylights on top of the
roof that exhaust the indoor air from a large naturally ventilated space. We
want to minimize the number of hours to close the skylights due to rain. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We have used buoyancy driving flows to
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to 100 fpm. Is there a standard or research, possible from stack flue design,
that states what exit velocities will prevent rain entrainment. The building
is in <st1:City w:st="on"><st1:place w:st="on">San Francisco</st1:place></st1:City>
so the rain is not torrential downpour. <o:p></o:p></span></font></p>
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10.0pt;font-family:Arial;color:navy'><br>
Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ian<o:p></o:p></span></font></p>
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