Subcommittees Talk Numbers During NFRC Spring Meeting
April 14, 2010

This 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 weren’t “realistic” for residential casement products, but added, “the size that’s in there now is not realistic for commercial [products], and that’s 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™ for further updates from the conference.

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