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For maximum strength and thermal efficiency, we recommend the Ribbon Series. A full-depth layer of polystyrene cushions and insulates each panel, while steel backing adds an extra layer of support. Together,
these provide an R-value of 9.83 for maximum thermal efficiency. From the solid construction and whisper-quiet operation to the distinctive look of this permium product, the Ribbon Series was designed to please and perform. The Ribbon Series(351,359) is constructed and backed with
heavy-gauge steel and carries a lifetime limited warranty.
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