DESCRIPTION The Grandio Automatic Louver Window Opener adjusts airflow based on temperature changes. This opener features a metal cylinder with an expanding mineral that pushes a piston to open the vent when heated. As it cools, a spring closes the vent. Attach it to the left side of your louver window for optimal cooling. Please call to order a Right Side Orientation Auto Opener for Louver Windows purchased prior to September 1, 2016.
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