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20” will be tight but if you know what you are doing it it doable. You will have to remove/not install an extension for it to fit. I have mine in a 21” and I don’t see why it wouldn’t fit a 20” opening
Sorry, there was a problem. Please try again later.Hello! To install this air conditioner, we recommend a window opening at least 13.25 inches tall and between 22 and 26 inches wide. ~Ashton
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