The RSI 18" Louver Wall Mounted Window is the perfect way to keep the interior of your greenhouse or structure cool. Made from extruded aluminum and featuring a simple yet effective design, this window automatically opens and closes based on the temperature inside the structure. It's easy to install and requires tools to cut an opening in the wall. Complete with overlapping slats to keep insects and animals out, this window vent is an excellent choice for any structure. Additional Details: