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Skip using their installation kit, it save a lot of room, most windows slide sideways these days anyway. Use the provided foam. You are going to want to cut a 1x2 shim to stop the window from being slid open anyway. Fill-in above with wood. Seal seems with the provided foam. This is how I do my older 1217 model.
Sorry, there was a problem. Please try again later.Hello! Thank you for your interest in the LG Window Air Conditioner model LW1222IVSM. Unfortunately, it cannot be installed in a window with a width of 25 inches at the narrowest points or 26 inches wide. This unit is specifically designed for standard double-hung windows with actual opening widths ranging from 27 inches to 39 inches. To ensure proper installation, both the top and bottom window sashes must allow for a clear vertical opening of 16 inches from the bottom of the upper sash to the inside sill. For more detailed information, you can download the owner’s manual for this unit from the following link: https://www.lg.com/us/support/product/lg-LW1222IVSM.AT1AYOW -Danee
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