Members Discuss Optical Properties During Summer Meeting
Subcommittees of the Research and Technology Committee met this
morning as part of day two of the National Fenestration and Rating
Council's (NFRC) summer meeting. The Optical Properties subcommittee,
chaired by Sheila Gore of Enermodal Engineering, was one of those
groups. Members discussed a number of ballots for revising NFRC
300/301 and NFRC 302/303/304 as part of the 2009 document cycle.
|Mike Thoman with ATI
chairs the NFRC's air leakage subcommittee meeting during Tuesday
afternoon's technical committee block.
Regarding the NFRC 300 ballot, some subcommittee members expressed
concerns about substitution of the glazing data set currently being
used as there are some differences between the way that American
International standards detail requirements compared to those of
the International Standards Organization (ISO). There was discussion
about moving to the international procedure, which would result
in slightly different optical and thermal product performance that
manufacturers and fabricators publish for their glass product constructions.
According to Greg Carney, technical director for the Glass Association
of North America, such a major change for the industry that would
require considerable discussion with the manufacturers and fabricators
to debate the merits and consider the ramifications.
There was also a brief discussion regarding a reference to diffused
products (such as patterned glass) in the 301 document.
"Diffusing products are important to this organization and
we need some way to evaluate [them], especially as NFRC moves toward
commercial buildings," said Mike Rubin with the Lawrence Berkeley
National Laboratory. "It's something we need to pay attention
they are a bit difficult to categorize
an important issue."
The documents will return to task group for further review and
Meetings are continuing this afternoon through Thursday with the
technical committee block, including the air leakage and U-factor
subcommittees. Stay tuned to USGNN.com for further updates.
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