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National Certified Testing Laboratories in York, PA conducted a full round of Air, Water and Structural testing on a 2Fold® Folding door. Additionally, they performed both thermal performance simulations an physical validation testing to gain approval for listing on the NFRC site. The NFRC® results are required to gain Energy Star® status. These results also qualify 2Fold™ for building envelop calculations superior to default numbers used to determine energy efficiency.

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