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I would not use an attic fan if you are adding soffit vents and have exhaust vents; http://www.airvent.com/homeowner/products/intakeSoffit-specs.shtml

The attic fans can easily pull conditioned air from below, especially without air sealing first, all the way from basement or crawlspace; http://www.advancedenergy.org/build...entilation/Attic Ventilation Case Studies.pdf
I hope he does more than just "checking around pipes"; http://www.google.com/url?sa=t&sour...sg=AFQjCNEV_sFpJPB8DwLjAd-t6PJoO842EQ&cad=rja

Check on the density of the new fiberglass insulation, be careful of 0.5# per cu.ft.= comes with convective loops when it gets cold; http://www.homeenergy.org/archive/hem.dis.anl.gov/eehem/92/920510.html

http://www.diychatroom.com/f98/biggest-loser-fiberglass-insulation-90438/

Gary
 
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