GODNOEI 39.4-41.5 Inch Vertical Window Fan For Sliding Windows Mute Stepless Speed Control (0-2800 Rpm) Window Exhaust Fan Waterproof Vertical Window Fan With Living Rooms Bedroom Attics Garages

["❤️【PLEASE MEASURE FIRST】Designed specifically for sliding window with 39.4\"-41.5\" inner frame height (measure vertical window frame space, NOT glass height). Features 1.97\" extendable spring mechanism. This custom-fit design is tailored for your vertical window fan installation, ensuring a snug, gap-free fit without tedious adjustments.","❤️【MULTI-SCENARIO APPLICATION】Exclusive design for sliding windows, with an aluminum alloy frame ensuring firmly hold on the window frame. As a dedicated window exhaust fan, it’s ideal for refreshing the air in pet areas, smoky spots, or any space lacking proper ventilation—effectively expelling stagnant air and odors.","❤️【INSTANT SETUP】Truly no-tools installation - simply extend the spring-loaded frame, insert into window frame and tighten it. This hassle-free process lets you set up your exhaust fan for window in minutes; removable anytime without damaging windows or leaving unsightly marks.","❤️【SLIM DESIGN, WINDOW-FRIENDLY】Enables smooth window open/close operation with the fan in right installation place. Our compact window vent fan comes with 5 high-performance fans behind stainless steel mesh for safety and sturdiness, never interfering with your daily window use.","❤️【FLEXIBLE AIRFLOW CONTROL】Stepless speed controller can adjust the airflow effortlessly, ranging from a soft breeze to powerful cooling, with no fixed settings. The window fan reversible airflow function (hidden in stepless adjustment) suits every season and diverse requirements—blow in fresh air in spring or exhaust hot air in summer."]