LASKO 2138 8 Electrically Reversible Twin Window Fan Type: Window Fan Fan Blade Size: 8 Speed Setting: 2 speeds Color: White Weight: 10 Feature: The 8 Electrically Reversible Twin Window Fan adds the convenience of in-window reverse and independently controlled motors, making it one of the most versatile twin window fans on the market. Independent Motor Control for Air Intake, Exhaust, or Exchange Adjustable Thermostat for Automatic Comfort Control Two, Whisper-Quiet Speeds E-Z-Click Expander Panels for a Safe, Custom Fit Fits Windows 25 to 35 Wide and 12 High and Larger Fully Assembled for Window Use (Snap-On Feet Included for Table or Floor Use) U.L. Listed Labor: 3 years limited Parts: 3 years limited