<html><head></head><body><div class="yahoo-style-wrap" style="font-family:verdana, helvetica, sans-serif;font-size:16px;"><div dir="ltr" data-setdir="false">It lets in lighting, but id thick.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Any help is appreciated.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">John R. Aulbach, PE</div></div></body></html>