![]() ![]() There are 3 speed settings, and you can switch between intake and exhaust. On the one hand, this makes it easy to install, but on the other, it means you’re restricted if you’re dealing with an awkward-sized window. The seal block is modular, meaning you just slot the pieces together to fit the required gap. This makes the Vornado a superior product, but it’s also 50% more expensive. In all fairness, the Sharper Image provides a less interesting airflow/dB ratio in comparison with the Vornado. On its lowest setting, you won’t really notice it, and it should still provide an acceptable breeze. This is louder than the Vornado but it’s still fairly quiet. Its noise output is fairly impressive: 40dB on low and 52dB on high. I’ve picked it as my best option for vertical sliding windows because unlike other window fans like the dual fan models or the Air King window fan, it has a much lower profile. They both use a squirrel cage blower, except this one is marginally cheaper and has a slightly lower CFM rating. This fan bar from Sharper Image is similar to the Vornado above. However, this similar model from Lasko has a CFM of 560, so we can assume the Holmes model is fairly similar. The main downside of this model are that it doesn’t list a CFM rating. All the controls are clear, and you can also buy a one-touch thermostat model. It plugs into a normal 120V wall outlet and fits vertically or horizontally into the window frame. Importantly, this twin window fan is easy to use. Of course, it won’t get cooler but does get warmer. There’s also a thermostat, giving you control over the temperature too. The motors are water resistant, meaning you can use the fan even when it’s raining. Plus, it’s a budget model, so you can expect it to not be in the same quality bracket as higher price models. While this does move into the normal noise output for a fan, in my experience, it’s not an unpleasant noise. Its decibel output ranges from 47dB on low to 51dB. To give you an idea, this airflow would comply with the recommended 8 air changes per hour in a 400 sq ft kitchen. For two 8” fans, we can calculate the corresponding airflow which equals 460 CFM. ![]() In terms of airflow, one user measured the airspeed at 7.5mph. Being able to control each fan independently gives you great flexibility. The 3 settings are intake, exhaust, or exchange, and you can set the fans to spin in either direction. It has twin fans that are 8” in diameter. It features an adjustable screen and clip-on extender to help you get the best fit on your window. This quiet window fan from Holmes is designed to find windows 25 to 37”. I also found users complaining that the foam inserts leave gaps in the corners between the unit and the insert. So, if you’re dealing with awkward-sized windows, you might find you have an extra gap. In my experience, a mix of solid plastic with foam is better, and these foam ones only offer whole-inch fillers. The foam inserts are slightly limiting, though. This helps to create a better seal, improving its energy efficiency. It also comes with foam blocks that you fit around the fan unit when installing. There are 4 speed settings and automatic temperature control. But, they’re still reversible and have a heat setting, meaning you don’t lose out on much. So technically, the Vornado is not a window fan but a window blower.Ī downside to this design is that you can’t have intake and exhaust at the same time, like on the Holmes and Bionaire models. I found, when looking at the inside components, that the airflow is generated not with propeller fans but with a squirrel cage blower, just like in tower fans. You can also check out that video for an example of its noise while operating. It’s generally meant for vertical sliding windows, although this video review shows you can install it vertically, too. Based on my knowledge of CFM ratings, it’ll be best in a room of 125 sq. As such, it’ll only provide a light breeze and will quickly become unnoticeable in larger rooms. However, its max CFM is only 137, which is quite low compared to other models on this list. Second, it’s got 4 speed settings, giving you good flexibility over air speed. First, its dB level at max speed is 45dB, which is decently quiet. The Vornado 4-Speed Window Fan is my top overall pick for a few reasons. ![]()
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