9 in. Twin Window Fan

The fan works well. The manual dial controls mean that it comes back on when power returns from an outage. The only issue that I ran into was that the curved top makes it a bit difficult to seal properly into a thicker window. I will need to cut out some foam pieces or something to make it seal better into the window.

Works great, fairly quiet like a white noise machine it'll make you sleep well lol. I used it on my renovation project to pull dust out and prevent it from going to the other rooms. On the picture it is up side down as i installed it on top instead of bottom.

It's a good fan but the knobs are a little low to the sill after install.

Pros I've read a lot of the negative reviews and was a little skeptical about getting this fan. It works great for my needs though. I moved into an old house that didn't have any ventilation in the bathroom (other than to open a window) so the paint was pealing from all the humidity. This fit into the window pretty well and I did do some caulking to make sure it's sealed. The air flow is a lot better than some people are saying. Maybe they got a defective fan? On high speed it's a little too strong for me, It'll blow the medicine cabinet door open and I had to attach a magnet to keep it shut. I mainly use it for exhaust when I'm taking a shower but it's great to have the ability to pull in cool air on a nice day. Measure your window to make sure it'll fit, realize it's meant for a small room not a large living room (as some seem to think) and as with all universal things you may need to do some slight modifications to make it work perfect for you. Cons I needed the cord to be a little longer than what it is (about 5 feet or so). My bathroom only has one outlet and its on the opposite side of where the plug comes out of the fan. I'll either move the outlet or add a longer cord. Still a cheaper option than drilling through the roof or walls to add a traditional bath exhaust.

I really love the fan. unlike former twin fans, this one changes the direction of flow with the contols, not by rotating the fan. Plus, the slim design fits in the window without removing the screen. Not only that but it also fits behind my shutters and does not impede the operation of the shutter blades at all. the only thing I wish it had is a little twist lock connector at the fan for the power cord. As it is I need to feed he cord through the shutter blades and it is cumbersome to pull the cord in or out every time I put it in the window. For security reasons I cannot leave it in the window when I am not home, first floor condo.

There is simply no way this fan produces anywhere near 1400CFM. I think it's more likely 140CFM. It's a nice looking fan, put together well, but it in no way, shape or form produces the amount of air it claims and since that's pretty much the main criteria on which to judge a fan, this one gets 1 star. Also, the accordion panel on the side locks into place which is a nice feature except for the fact that the lock is on top and bottom. The top is easy to lock, the bottom is not, because as you attempt to slide out the panel, the weight of the fan depresses the lock. That flaw could be overlooked if it drew out a lot of air. It just doesn't. Your basic microwave fan or bathroom fan is likely rated at 300CFM or less and both are more powerful. If I hadn't lost the receipt this would be going back. *Picture taken right before removing from the window. Installed there was a piece of foam underneath to seal up the gap and a white panel above with another piece of foam to get the location in the upper window at the right height and seal it to any leaks coming in. Picture was more to demonstate I actually own the product, since I bought it in store.

This fan has been a total life saver for us from the blazing heat in Southern California! I read the reviews before purchasing and took a chance. We use this in our bedroom. It's a large master, about 16 x 12 with a vaulted ceiling approximately 8 ft on one side and 12-14 feet on the other. We had a portable ac unit but it never cooled the room like we wanted, mostly blew warm air around and eventually broke. Our bedroom is also located on the 2nd floor so all the heat rises up and it was impossible to cool even though it was cold outside in the evenings. With this fan we can shut the door and blow cool air into the room. The exchange of in/out air is an awesome feature since we live next to a busy street/frwy and exhaust comes in from time to time. We can just reverse the fans to get the bad air out. PLUS it has the dial for temperature control, so if you're going to sleep you can set it just above where it would turn off. This way when it get's colder at night, it will shut off automatically. When it gets to be 90-100 degrees, we add an additional fan in the room to help with the heat issue. The unit is pretty easy to maneuver in and out the window and store away. Our window is vertical so we will probably eventually add something to block the top space that's open when in use (see photo). **2 things I wish it had: 1) A filter of some sort to purify the air that comes in. 2) Louver type slats that can be moved to adjust which way the air flows in. In closing, the unit isn't a miracle worker. If it's hotter than heck outside, there's only so much cooling it can do. It may not work for everyone but for us it's been a dream and we've had it since October 2015. We've run it all night/day during the hot months and it's still holding up perfectly! Worth every penny for us.

It's very easy to set up. Very versatil. I use it in a Food truck, where I need to remove it to drive, and re-install it once stationary, and even then it's very practical. Works great. I have use for it, both, bringing air in, and also extracting the air out, depending whether it is just parked, or being occupied. I've had these units before in an apartment window, and it also worked great there, removing stale air out of the bedroom. By using two units in opposing areas of the dwelling (one out, and one in) you'll be able to have a steady movement of air current throughout the whole area in between. I just love those units.

Very sturdy construction, but light weight. Thin enough that I could leave the screen in place, so no bugs. Incredibly quiet and unobtrusive. I'm using it as a vent fan for a bathroom, so the small size is a plus. It even fits behind the plantation shutters! I love the 'exchange' setting which draws air in with one fan and blows it out with the other. Installation took 3 minutes max. You won't go wrong with this fan.

Context: We use the fan to cool our living space in the evening and night during the summer. Features: 1. The unit was far better than we expected in terms of build quality and function. 2. We were so pleased with the extra window closure panel that extended the range of the built in, adjustable width/ height adapter. 3. The speed adjustments, reversing of the fan rotation direction with a switch and bi-directionality (one exhausting while other was blowing inward) are great. While the thermostat function allows one to set a trigger level for the fan operation, a feature that we don't use since in the day temperatures can be over one-hundred Fahrenheit and leaving the fan in the window would not be sensible because the incoming air through the fan openings would heat up our living space beyond the comfort level. More About How We Use The Product - by way of explaining why we wanted it and our evaluation What we do is wait until the evening, outdoor air is equal to the indoor temperature, then we open the window, install the fan, set the speed to max exhaust speed through our living room window and then open our bedroom window to cool our bedroom first and then more slowly the living room since the bedroom air coming through is warmed by the bedroom itself before reaching the living room. We get as high as a twenty degree differential between the indoor and outdoor temperature during the day by shutting off the fan in the morning when the indoor/ outdoor temperature differential is zero (same level) and we remove the fan and close the window until evening when we begin the cycle all over again. Installation Considerations - Our Experience with the type of window in our house For our use, where we have sliding, wood framed, thermopane windows, where the depth of the window assembly is less than four inches from inside to outside, the fan body depth exceeds space between window sash and the window screen, so the fan unit cannot be installed with the screen in place. Not wanting to remove the screen, we built a wood frame surround (box) to mount the fan offset, away from the screen. The window now closes against the frame and small wood blocks on the outside of the frame lock into the window groove to keep the fan from toppling out of position and falling. See Installation Photo Tuning Up Fan Performance Now a word about the fans power - air moving ability. We noticed that the unit was not able to match the air flow of our small, 40 watt box fan which we bought in Malaysia while traveling, and we use around the house via a 220 volt travel adapter. It was this fan that we were replacing for window use. We were incredulous that our new twin fan unit could not keep up with our old mini-box fan. So we measured the fan face diameters for the new unit and the old one: the new is twin 9 inch diameter fans and the old was only 12 inches (we brought this diminutive baby home in our suitcase). Actually the new fans have more square inches of flow area than the old 12 mini-box fan (pi r squared x two fans vs pi r squared for the single fan). So, why the poorer performance. And then we noticed that, while the new twin fans had nice aerodynamic blades, they were something like 10 decibels more noisy. Then we took a closer look through the grille of the new fans: They start off great with a ducted fan design, so why the noise and lower performance??? Closer examination shows a real boo boo on the exit path for the fan air: The air exits the fan into a non ducted cavity and the air path is not aligned with the fan axis. Not only that, but the exit grille is not circular, not aligned and smaller in area than the fan face diameter: naughty, naughty. This causes turbulence, loss of efficiency (lower performance) and noise generation. We love this new fan pair though and the manufacturer almost got it right . . . so we just inscribed exit circles on the exit side of the case in a larger diameter, but aligned with the fan axis and cut the plastic away with a utility knife. We then took a bit of aluminum sheeting from a dryer vent (purchased from Home Depot) and completed the original plastic duct to conduct the air smoothly to exit the case. Since the fan exit faces the window screen in use, we did not make a new exit grille. Wow, now the noise is reduced and the fan efficiency has increased majorly so we equal or exceed the old mini- box fan. Our house is cool all day - see above technique description - and we are very happy with this fan unit, even though there were some practical issues in both fitting it into our average, normal wood framed sliding window and in the poor fan exit path design. All in all, a great unit and it works well even though the manufacturer missed it a little it was retrievable: We would recommend the fan over similar designs that really have less features and function.