NFRC’s certification and labeling program requires that a temporary and a permanent label be affixed to each product in order to be considered certified.

When you purchase NFRC-certified windows, doors, or skylights, the product(s) should arrive with both labels applied. The following describes these labels and explains the difference between the two:

Temporary Label

The temporary label is generally printed on adhesive paper, about the size of a large index card, and affixed to the interior glazing surface.

This label explains the product’s energy performance ratings, including U-factor, Solar Heat Gain Coefficient, and Visible Transmittance. If the temporary label is missing, the product is considered not certified, whether it is authorized for certification or not.


Any product labeled after April 1, 2012 will display a NFRC’s Certified Products Directory (CPD) number, which you can use to verify the performance information on the NFRC Search Directory. If the CPD number is not displayed, the description and performance values can be verified as well, with tools available on the NFRC Search Directory and the NFRC website.

Permanent Label

NFRC’s permanent label can be an adhesive label, such as a tab included alongside other information, or a series of marks, or etchings. The permanent label can be found along the side jambs, at the top on the header, at the bottom on the sill, or between the panes of glass on the spacer of the product.

The manufacturer’s or product’s NFRC identification codes are typically found on the right-hand side of the label. Unlike the temporary label, however, the permanent label does not display performance information. This label may, however, display a NFRC’s Certified Products Directory (CPD) number, which you can use to acquire the performance information. If the permanent label displays NFRC’s CPD number, you can enter it here to acquire the specific product line’s performance information.

See illustrations below:

 
Visit our website or contact NFRC’s Product Certification Program Coordinator (PCP), Airienne Jeffery, at 240-821-9518 for more information.