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This Optimus F-5286 8" electrically reversible twin window fan features a 3-speed rain-resistant motor and automatic thermostat control for custom operation, so you can easily maintain a comfortable temperature in your office or living space.
Q: What are the decibels of the window fans?
A: Not sure the exact decibels but it was pretty quiet. You can hear it but you hardly notice it
Q: What is the CFM of this fan?
A: undefined
A: It does work vertical. Though the sides do not go out far enough for my window. A standard window it would cover fine is just a very tall window. Both sides have an adjustable panel.
Q: Does the sides of fan expand to fit openings in window?
A: The sides do expand but all my windows slide sideways open so no help there
Q: Please let me know what the width is and depth are ?
A: It is 5.9" wide and 24.2" deep.
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This Optimus F-5286 8" electrically reversible twin window fan features a 3-speed rain-resistant motor and automatic thermostat control for custom operation, so you can easily maintain a comfortable temperature in your office or living space.

The Electrically Reversible Twin Window Fan with Bluetooth from Lasko allows you to control your fan with your smart phone. Two independently controlled motors for intake, exhaust, or air exchange. Easily adjust the brightness of the easy-to-read digital display. The included thermostat senses room temperature and turns fan on or off to maintain comfort. Features an electronic 8-hour timer and 3 quiet speeds. This window fan includes expanding side panels for a safe custom fit in double hung, casement, or sliding windows sized 24 to 32 inches wide and 12 inches high or larger. Comes equipped with the Lasko Blue Plug, patented safety fuse technology. Fully assembled for window use.

Vornado creates cutting edge products - so when we set out to create a window fan, we did our research and then rewrote the formula. The result was just over 6" tall, unobtrusive and clever enough to be seamlessly installed in windows from 24” up to 38" wide using an innovative modular block system. Its electronically reversible chamber smoothly brings fresh air in or exhausts stale air out. Rain or shine, the weather-resistant casing doesn’t mind. Either way, you’ll still enjoy the view.

Is your living room or bedroom affected by humidity? Improve air quality with an indoor ventilation fan. Built-in AC motor with high airflow, effectively improving air circulation. It comes with complete installation accessories, and the panel is pre-drilled to make installation easy.