HOW DO SLIDER SAFE® EXTENDER PANELS HELP FIT A FAN INTO A WINDOW? Extender panels can be used to fit window fans into both horizontal and vertical positions. They slide into the right side of your window fans, to allow for a tight fit in your window. Holmes® window fans come with patented Slider Safe® extender panels, which are designed to provide stability in the vertical position used with a slider window. < Back
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