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  1. Ferdinand
    Can anyone quote me a specific example or two of the efficiency level of an MVHR system, and supporting data? I'm having a debate elsewhere (about how far we can reduce energy demand in narrow boats, of all things), "90%" has been quoted for MHVR efficiency (I had quoted 75%-80% for HR extract fans), and someone has asked for evidence for the 90% 🙂. Thanks Ferdinand
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