Subcommittees Talk Numbers During NFRC Spring
April 14, 2010
morning participants in the National Fenestration Rating Council
(NFRC) spring membership meeting, taking place this week in New
Orleans, heard progress report from the subcommittees that met earlier
this week during the Technical Committee meeting.
The Air Leakage Subcommittee discussed a negative on the ballot
regarding Section 4.E of NFRC 400-2010 that proposed using two decimal
points for air leakage rather than rounding to one. Two decimal
places is a lot more fair and accurate than the rounding we do here,
Steve Harp of Associated Materials commented. According to Harp,
Florida soon may require an air leakage number on its labels, and
that may have two decimals points.
Others noted that the North American Fenestration Standard (NAFS)
uses one point and that consistency with NAFS should be a priority.
Following that logic, the motion ultimately failed and the ballot
was moved forward to the Technical Committee.
Next, the U-Factor Subcommittee also reviewed a ballot on changing
numbers, this time a proposed change in the sizes of casement-awning
models in NFRC 100.
Steve Johnson of Anderson Corp. offered a negative on the ballot,
noting that there needed to be more justification to change from
the existing size grid. He noted that the current sizes were
selected to represent common casement products. This [change] would
require us to build something for simulation that nobody in practice
actually manufactures. Steve Strawn of Jeld-Wen advised sending
the section back to the task group to justify a size change and
come up with sizes that make sense.
Tom Culp of Birch Poin Consulting agreed that the suggested sizes
werent realistic for residential casement products,
but added, the size thats in there now is not realistic
for commercial [products], and thats the heart of the problem.
As he explained, This table is also referenced by CMA.
As others spoke in support of including two sizes - residential
and architectural - it ultimately was voted to return this document
to its task group for further work.
Under new business, Joe Hayden of Pella Corp. asked to form a task
group to look at initial grouping rules regarding sightlines. Right
now, he explained, The way the wording is in the grouping
section, if you make any change to sightlines whatsoever you have
to re-simulate. That goes for changes as small as 1/16-inch
increments. In order to eventually allow for a range of sightlines
in any group - as a starting point, he suggested +/- ½-inch
- he proposed that a task group look into this issue.
Stay tuned to USGNN.com for further updates from the conference.
Need more info and analysis about the issues?
HERE to subscribe to USGlass magazine.