Lasko 2155A 16" Reversable Window Fan The 2155A Reversible window fan has three powerful 16inch paddle blades. The fan has an exclusive Storm Guard feature that enables the window to be closed behind the fan during inclement weather or when securing the home. Fan has three quiet, energyefficient speeds.The electrically reversible motor is operated with a simple turn of the dial. Fan fits window 26.5 to 34.5 wide and at least 22 high.