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I'm all for simplicity, so I'm with the "open when the fan is on" opinion since I don't have to worry about temp sensors and electronics. Once mine is built (before end of winter maybe?) it'll be an electromagnet and a spring controlling blind-like flaps.
If I could find a very simple electronic sensor and control mechanism with a variable position actuator; that'd be nice and easily swappable for my current setup. But I don't have the electronics chops for that kind of thing yet.
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