Software
Heat Transfer
Modeling Tools for Fenestration Products
NFRC Approved Software
List

THERM
5.2 - A Windows-based program used for modeling and calculating
heat flow through framing systems

WINDOW
5.2 - A DOS-based program that calculates the overall thermal
transmission of window systems

Spectral
Data Library - This library update contains NFRC approved
spectral data for the WINDOW analysis program.

FRAME 4.0 - A Windows-based
program used for modeling and calculating heat flow through framing
systems
OPTICS
5.1.02 - A Windows-based program for analyzing optical properties
of glazing system. Note: this software is approved
only creating a laminant for NFRC according to the NFRC document
Creating a Laminate in Optics for NFRC.
Other Useful Software

RESFEN
3.1 - A Windows-based program used for estimating the energy
effect of fenestration products on typical one and two story homes
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