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LOVE!! barn door baby gate or pet gate!! Our pets and baby have outgrown the Dutch door we made at our house, but now it serves as a noise block from the AC/heater, without blocking to much air for the return. We made ours from a core door cut in 1/2 with a shelf on top. I like this one better.
A secured-to-the-wall half door instead of a wedged in baby gate. Interesting. Bonus is that it doesn't have to be permanent if you don't want it to be...unscrew it, patch things up. Voila!