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Fiberglass frames

Product Specifications ...low embodied-energy and environmental source-cost ratings. Rapidly emerging NFRC values from various North American manufacturers document the thermal conductivity of pultrusion fiberglass frames to be the lowest in the industry. Reduced in conductivity relative to aluminum by a factor of more than 600, fiberglass outperforms standard wood and... See #1. 1: http://www.alpeninc.com [c1251481]