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What is this?


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I saw this today during an inspection and I can't figure out what it is for. The two rectangular ducts are the supply and return right after (or before) the FAU. I assume this rod connects to a damper inside the round duct and there is a weight or counterbalance on the rod.

What is it for? Why would you ever want or need to open this path? Why a weight/counterbalance?

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