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The window kit is not necessary. I installed mine without it. My 15000 btu unit was 24 inches wide with a 27 inch window opening. I used some rigid foam to fill in the gap to the window frame.
Sorry, there was a problem. Please try again later.Hey, Valued Customer! We recommend the window kit to be installed even if the A/C fits directly into the opening for proper venting. You will be able to use the A/C with a 26" opening. ~Courtney
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