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Hi, please check this link https://www.youtube.com/watch?v=1txg3e9mo2M. ^Vanessa
Sorry, there was a problem. Please try again later.21" should be fine, the issue i had was where my outlet is there's duct work above so i had to move unit to the left side which futher away then my non-stackable and i had to get a longer 240v cord, which was hard to find. I had to get a 10ft which i found on Amazon because BestBuy was out of stock
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