RSI Louvered Window Vent 18" x 18"FREE SHIPPING! 18 inch x 18 inch square Made from non rusting extruded Aluminum Temperature sensitive Automatic opener arm included taking the guesswork out of when to open and close Louver slat fold into of themselves to prevent insects from entering when closed Natural Aluminum color Will work with almost any structure Proudly Designed and made in the U. S. A. Description The RSI louvered Window Vent helps to cool the inside temperatures of any