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    I usually involve three wires. Some ERV come with...

    I usually involve three wires. Some ERV come with the terminals ready and some do not and you will be required to figured it out yourself. But you don't want to power the "G" terminal other then the...
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    ERV

    I try to stay away from penetrating roofs whenever possible. Is it possible for you?

    Are you using this for fresh air only or an exhaust system? With FA only, all you need is to pipe it in the...
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