Contemplating these for mine. How "sealed' are they when closed? Is there any "exhaust leak" noise around the butterfly valves?
Also wondering how often I'd have then open... do you find you have them open a lot or is it more of a novelty and rarely open.
I love the concept, but concerned it would lose its appeal quickly and then seldom be used (and that's a lot of cash to have sit idle (no pun intended)).
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