Standard: NFRC 202 – Procedure for Determining Translucent Fenestration Product Visible Transmittance at Normal Incidence

Scope: This test is applicable to both residential and commercial fenestration products that utilize translucent fiberglass and/or plastic sandwich panels.

Applicable Products: Translucent fiberglass and/or plastic multicell sandwich panels used as glazing in windows, doors, skylights and curtain walls. It can be used only on flat products.

Test Procedure: This test uses photometric sensors to determine the amount of light passing through the glazing panel in multiple locations. The panel is oriented at normal incidence to the sun and the light transmission is measured.

End Result: The Visible Transmittance (VT) of the glazing panel is determined. This value can be used to determine the overall VT for a product including frame and glazing. The VT can be used to determine the natural light coming through the windows. This typically is used to certify windows, doors, skylights and curtain walls for VT. This is almost always done in conjunction with ANSI/NFRC 100 testing for U-Factor and NFRC 201 testing for SHGC.

Special Notes: This method is used when non-standard glazing is used in a fenestration product. It is used only for products which cannot use ANSI/NFRC 200 computer simulation methods. When NFRC 202 is required for VT, NFRC 201 will be applicable to determine Solar Heat Gain Coefficient (SHGC) of those products.


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