I'm trying to keep everything cost-effective on the SIPS house I'm building so I'm avoiding importing European super-products.  I'm trying to make the house as airtight as feasible given cost constraints. The NFRC website and manufacturers' websites don't seem to have a thing about air infiltration rates on doors.  Does anybody know of any especially tight-sealing door systems?

We're using a Thermatru fiberglass entry door with sidelights - it's supposed to be very good on air infiltration.

http://thermatru.com/pdfs/EstarChart.pdf

Oddly enough, I've provisionally chosen the same brand, just because they have a model I like for the looks. I was hoping for something more than "supposed to be good", if possible, though. Nobody seems to report infiltration data for doors.