D4 wrote:
Andersen gliders do not seal any better than any others. If you go to
nfrc.org and check out the thermal performance for ANYONE's casement
windows, they will seal better than any slider/ glider.

Thermal performance, U-Value, and air infiltration are two different
animals. I was primarily talking about the window seal and air
infiltration. I just visited the NFRC site and didn't see any
information on air infiltration - just U-values. Where can I find that
information on that site?

R