We ask a lot of patio doors. These huge panels of glass that provide wide-open views of the outdoors are expected to operate effortlessly while keeping us safe from drenching rains, high winds, pests, and intruders. We also expect them to keep our indoor-living spaces comfortable during the depths of winter and the dog days of summer. If that weren't enough, we want our patio doors to be attractive, complementing both the interior and exterior of our homes.
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