Keen Vents - How to control?

Nope. You can use the ST default device handler or Community developed ones. ST discovers them just fine. There are also a couple really good SmartApps you should also experiment with, specifically this one:

I had a similar problem with 4x12 vents needing to fit into a larger opening. I was able to make an adapter plate using a solid white plastic cutting board.

You can also check here:

https://www.ponoko.com/account/login

Here’s more info:

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