May 2015: Series 3050 NFRC Tested & Labeled
Customers can now achieve a U-Factor as low as .48. More
Test reports have now been posted on the Series 3050 online product page verifying compliance with the NFRC energy standards with either the 1″ or 1-1/2″ Hidden Tracks. The bottom rail weather-stripping has been changed to a sloping vinyl instead of the brush style. Test results are available for viewing within the Energy Test Results section on the product page.