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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.

This BLACK+DECKER 9 inch twin window fan is ideal for enhanced indoor air circulation in any room in your home -- whether it's your bedroom, bathroom, kitchen, attic or elsewhere in your home. With convenient dimensions of 23.8" x 4" x 12.6" and a weight of only 4.5 lbs., our dual horizontal window fan with rust-resistant construction can easily accommodate any window from 22.5" - 33" Wide. This twin electric fan has 2 speed settings with mechanical controls, as well as a carrying handle for seamless transportation. Additionally, our outstanding twin window fan comes with accordion expanders that range from 22.5" - 33" as well as removable legs to accommodate the perfect window fit. Dual 9 poly fans are designed for maximum airflow. Removable legs allow you to transition from window to table or floor fan with ease. Our dual room fan is easy to install, requiring minimal tools and effort. Secure in place without any additional support! Our twin window fan can be manually reversed with a convenient dual-sided control dial to allow convenient exhaust fan functionality. Simply turn over the fan to convert to an exhaust for musky or stagnant air. Save on energy bills with a constant breeze and indoor temperature regulation thanks to this outstanding twin small window fan. Simply remove your window screen and install your new BLACK+DECKER 9 inch twin window fan and enjoy the cool and comfortable temperature and breeze.