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It has a sleeve
Sorry, there was a problem. Please try again later.I think this willanswer your question, You take the casing off the unit and install in window first. Then put the unit back together in windowl. So no separate casing.
Sorry, there was a problem. Please try again later.The 15,000 BTU unit works very well with an energy saver. It is a complete unit with it's own sleeve. My unit fit into a fixed sleeve that was left by the old unit that was larger and pulled out of it's case.
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