NFRC 100: Procedure for Determining Fenestration Product U-factors
NFRC
2001
National Fenestration Rating Council, Silver Spring, MD
NFRC, (2001), NFRC 100: Procedure for Determining Fenestration Product U-factors, National Fenestration Rating Council, Silver Spring, MD.
| Abstract: |
| Purpose
To specify a method for determining fenestration product Ufactor (thermal transmittance).
Consumers today have many energy saving fenestration product options to choose from. Advances in fenestration product technologies include the use of low-emissivity coatings, low-conductivity gas-fills, insulating spacers, and new frame materials and designs. While the use of one or more of these components will improve fenestration product thermal performance, it will also increase the complexity of the selection process. This procedure has been developed by the National Fenestration Rating Council (NFRC) to meet the need for a uniform and accurate means for evaluating the U-factors of fenestration systems using state-of-the-art simulation procedures validated with physical testing. The U-factors established by this procedure are determined at a fixed set of environmental conditions. Consequently, the U-factors determined using this procedure may not be appropriate for directly determining seasonal energy performance. This document supercedes and replaces NFRC 100-91.
A procedure to evaluate total product solar heat gain coefficients and visible transmittances is addressed in NFRC 200; to determine glazing layer optical properties in NFRC 300 and NFRC 301, to determine air leakage rates in NFRC 400, and to determine annual energy effects in NFRC 900. A procedure to address condensation resistance factors is under development. |
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This publication in whole or part may be found online at:  here. |
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