Door Energy Ratings (DER's)

[caption id="attachment_181" align="alignright" width="195" caption="Door Energy Ratings"][/caption] Rockdoor is pleased to confirm that Door Energy Ratings (DER's) are here at long last.  For over 4 years Rockdoor has been pushing for the introduction of DER's as a simple and widely recognised method of informing customers with regards the energy efficency of Rockdoors. DER's are a volunt…

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