Gear can be installed on the inside, outside and middle/center pillar (also called a mullion) of your window frame. Even if your frame is made of metal, aluminum or concrete. See the photo below for examples of Gear being mounted in these different positions.
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Your Gear will come bundled with a mounting bracket that can be installed on to your window frame using screws or double-sided adhesive tape, which both come included in your package. The tape is recommended for middle section installations or if your window frame is made of metal, concrete or aluminum.