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if you want to to use the frame they give you you would need that "extra space" but in a 14.5 window it would just fit .....so to seal the edges i would use aluminum tape to make it air tight..i would go for it.
Sorry, there was a problem. Please try again later.Thank you for your inquiry, Dimensions! After viewing the minimum width required for installation. You may be unable to install this model in a window with a width of 14.5". We hope this information was helpful to you and your shopping experience. -Ciara
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