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Thank you for your inquiry! The window dimensions for this unit are as follow: D -Height (Min.) 15-1/2" E -Width (Min. / Max.) 23" / 36" Hope this helps!
Sorry, there was a problem. Please try again later.I just measured mine, compressing the accordion sides, and I think your 21" window is two inches too narrow. It might go in a 23" wide window... maybe.
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