Subcommittee Rejects Ballot to Remove Default Values for Frame Grouping
The frame grouping research ballot was a major discussion point
during the Component Modeling Approach (CMA) - technical subcommittee
meeting this morning, part of the National Fenestration Rating Council's
(NFRC) fall meeting. Tom Culp from Birch Point Consulting has been
heading the project and reported to the group on the negatives that
have been received.
The default values for framing products were a concern to some members
who questioned the validity and accuracy of certain numbers. Mike
Thoman of Architectural Testing Inc., submitted a negative requesting
that the default table be removed. "The table should be removed
as it's not appropriate for [determining] an NFRC 100 rating,"
he said Thoman. "I have issues with using default values as
I do not think it's in alignment with NFRC's mission."
was a great deal of debate among members over whether the default
values should be further reviewed or removed all together.
Culp spoke out against the motion to remove the default value table.
He said having the default values would make it easier for manufacturers,
especially smaller companies, to use the CMA program, as with this
they would not have to have every one of their own products tested
and rated. Culp suggested that the ballot go back for further review
and research, but that the default table remain.
Jeff Baker from WESTLab, and chair of the technical committee,
spoke strongly in favor of removing the default table.
"I'm not sure that default frame numbers, when there are huge
variables, [will provide] accurate and credible results," Baker
Others agreed with Culp that having the default values would be
"It simplifies what the industry is looking for," said
Mike Manteghi from Traco, who also serves as the CMA - technical
subcommittee chair. "There are a lot of standardized products
already out there."
After much discussion, members voted on the motion to remove the
default table, and the majority, 32 to 16, voted against it. A motion
was made and passed to keep the default table, but to further review
and research the information for accuracy and credibility.
Baker said he felt this was a "substantial departure"
from the NFRC, and said the matter would require direction from
the board. After speaking to NFRC staff and board members, though,
Baker retracted his concerns, as he said the work of the subcommittee
on the frame grouping rule is in line with what the board had agreed
to previously. He said the board would consider using the default
values for framing materials.
Meetings will continue this afternoon and conclude tomorrow morning
with the NFRC board meeting.
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