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<DIV>I've typically modeled infiltration using Effective-Leakage-Areas with the
LBNL Sherman-Grismrud Model rather than use Air-Changes-per-Hour. For example, a
typical construction tightness would be a E-L-A of 0.0005 (ft2 openings/ft2
floor area), 0.0003 for tight construction, etc. Using the S-G model
allows me to set the E-L-As of the unconditioned spaces to their amount of
vents, for which there are rules of thumb, and let the S-G model figure out the
resultant air-change rates depending on temperature difference and wind
speed.</DIV>
<DIV> </DIV>
<DIV>Joe</DIV>
<DIV> </DIV>
<DIV>----- Original Message ----- </DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=idoebber@vt.edu href="mailto:idoebber@vt.edu">Ian Doebber</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=BLDG-SIM@gard.com
href="mailto:BLDG-SIM@gard.com">BLDG-SIM@gard.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, September 01, 2004 6:05
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] typical attic,
garage, and basement infiltration rates for a single family house</DIV>
<DIV><BR></DIV>
<DIV>What would be a good range for the ACH of infiltration in a recently
constructed home that can be considered to have a tight construction. I
am modeling the ACH for the conditioned zones to be roughly 0.5 ACH and was
wondering what I should specify for the roof, garage, and basement. My
roof has a vapor retarder in it.</DIV>
<DIV> </DIV>
<DIV>Thanks </DIV>
<DIV>Ian Doebber</DIV><PRE>
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