Folks:

A quick survey:

Are people using the NRFC standard rating conditions (including standard window unit sizes per http://www.nfrc.org/documents/1997_NFRC100.pdf Table 1 p15) for assembly u-factors for windows in the Proposed Case?

I know the ASHRAE 5.8.2.4 references the NRFC 100 test, but I'm debating whether I should request custom calculations for my project's windows at their actual size, or accept manufacturer's standard literature based on the NRFC 100 rating sizes.

I know I can explicitly define the frame and glazing, which I prefer to do, but sometimes it isn't an option.

Thanks,

Aaron Dahlstrom , PE, LEED(r) AP