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The description below is for an image or graphic that appears in the page: The Devon Retrofit Guide

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Arrows into and out of the Mechanical Ventilation with Heat Recovery (MVHR) show that 0 degrees Celsius outside leads to 19 degrees Celsius supply, while extracting 20 degrees Celsius leads to 1 degrees Celsius exhaust. This shows that an MVHR is a 95% efficient heat exchanger.

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