Norma Nfrc 100, 2010

National
Fenestration
Rating Council
Incorporated
NFRC 100-2010[E0A4]
Procedure for
Determining Fenestration Product U-factors
© 2010 NATIONAL FENESTRATION RATING COUNCIL, INC.

PREPARED BY:
National Fenestration Rating Council
6305 Ivy Lane, Suite 140
Greenbelt, MD 20770
Voice: (301) 589-1776
Fax: (301) 589-3884
Email: info@nfrc.org
Website: www.nfrc.org

FOREWORD
TheNational Fenestration Rating Council, Incorporated (NFRC) develops and operates a
uniform rating system for energy and energy-related performance of fenestration and
fenestration attachment products. The Rating System determines the U-factor, Solar Heat
Gain Coefficient (SHGC), and Visible Transmittance (VT) of a product, which are mandatory
ratings for labeling NFRC-certified products, and aremandatory ratings for inclusion on label
certificates, and are supplemented by procedures for voluntary ratings of products for Air
Leakage (AL) and Condensation Resistance. Together these rating procedures, as set forth
in documents published by NFRC, are known as the NFRC Rating System.
The NFRC Rating System employs computer simulation and physical testing by NFRCaccredited laboratories toestablish energy and related performance ratings for fenestration
and fenestration attachment product types. The NFRC Rating System is reinforced by a
certification program under which NFRC-licensed responsible parties claiming NFRC
product certification shall label and certify fenestration and fenestration attachment products
to indicate those energy and related performance ratings, provided theratings are
authorized for certification by an NFRC-licensed Certification and Inspection Agency (IA).
The requirements of the rating, certification, and labeling programs (Certification Programs)
are set forth in the most recent versions of the following as amended, updated, or
interpreted from time to time:
•

NFRC 700 Product Certification Program (PCP)

•

NFRC 705 Component ModelingApproach (CMA) Product Certification Program
(CMA-PCP)

and through the Certification Programs and the most recent versions of its companion
programs as amended, updated, or interpreted from time to time:
•

The laboratory accreditation program (Accreditation Program), as set forth in the
NFRC 701 Laboratory Accreditation Program (LAP)

•

The IA licensing program (IA Program), as setforth in NFRC 702 Certification
Agency Program (CAP)

•

The CMA Approved Calculation Entity (ACE) licensing program (ACE Program) as
set forth in the NFRC 708 Calculation Entity Approval Program (CEAP)

NFRC intends to ensure the integrity and uniformity of NFRC ratings, certification, and

NFRC 100-2010[E0A4]

page ii

labeling by ensuring that responsible parties, testing andsimulation laboratories, and IAs
adhere to strict NFRC requirements.
In order to participate in the Certification Programs, a Manufacturer/Responsible Party shall
rate a product whose energy and energy-related performance characteristics are to be
certified in accordance with mandatory NFRC rating procedures. At present, a
Manufacturer/Responsible Party may elect to rate products for U-factor,SHGC, VT, AL,
condensation resistance, or any other procedure adopted by NFRC, and to include those
ratings on the NFRC temporary label affixed to its products or on the NFRC Label
Certificate. U-factor, SHGC and VT, AL, and condensation resistance rating reports shall be
obtained from a laboratory that has been accredited by NFRC in accordance with the
requirements of the NFRC 701.
Therating shall then be reviewed by an IA that has been licensed by NFRC in accordance
with the requirements of the NFRC 702. NFRC-licensed IAs review label format and content,
conduct in-plant inspections for quality assurance in accordance with the requirements of
the NFRC 702, and issue a product Certification Authorization Report (CAR) and may
approve for issuance an NFRC Label Certificate for...