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My ARC-1230WNH came with two sliding panels for either a horizontal or vertical installation. The primary panel with the cutout for the dual hose assembly is 18.5 inches. And according the owners manual, this panel can be used by itself to install the air conditioner hose assembly. I would also estimate that 2 or 3 inches could be removed from that panel if necessary in a hung window installation.
Sorry, there was a problem. Please try again later.My window was approx 24" wide so ibused a table saw to rip off 2" of the plastic window kit piece.
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