<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">The reason is fire, as in FIRE! <br><div apple-content-edited="true">
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-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Clarke Olsen<br><a href="http://clarkeolsendesign.com">clarkeolsendesign.com</a><br>373 route 203<br>Spencertown, NY 12165 <br>USA<br>518-392-4640<br>colsen@taconic.net<br><br></div></span></div></span></div></span></div></span></div></span></div></span></div></span></span></div><div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div style="color: rgb(0, 0, 0); "><div style="font-style: normal; display: inline; color: rgb(0, 0, 0); font-weight: normal; text-decoration: none; "><div dir="ltr"><div style="color: rgb(0, 0, 0); "><br>
<div style="font-family: 'Times New Roman'; font-size: 14pt; "><font face="Calibri"><font size="3">Looking in our <em><strong>Virginia
Residential Code</strong></em> which is for the most part based on the
<em><strong>International Residential Code</strong> says the following:
</em></font></font></div>
<div style="font-family: 'Times New Roman'; font-size: 14pt; "><font size="3" face="Calibri"><em></em></font> </div>
<div style="font-family: 'Times New Roman'; font-size: 14pt; "><font face="Calibri"><font size="3"><em>Use of gypsum products to construct
return ducts or plenums is permitted, provided that the air temperature does not
exceed 125F and exposed surfaces not subject to condensation.</em>
</font></font></div>
<div style="font-family: 'Times New Roman'; font-size: 14pt; "><font size="3" face="Calibri"></font> </div>
<div style="font-family: 'Times New Roman'; font-size: 14pt; "><em><font size="3" face="Calibri"></font></em> </div>
<div style="font-family: 'Times New Roman'; font-size: 14pt; "><font size="3" face="Calibri"><em></em></font> </div>
<div style="font-family: 'Times New Roman'; font-size: 14pt; "><font size="3" face="Calibri"><em>Stud cavities shall not convey air from more
than one floor level.
</em></font></div></div></div></div></div></div></div>
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