We have this installed in our grow house. It works well and allows the air to circulate. We've not noticed any mold of mildew build up on our plants. The fan is somewhat quiet also. Very pleased.

Got this for one of my grow tents and it's made a huge difference in my air quality, temperature and smell. Even at halfway, it's will suck in all the walls of my tent and no smells can escape. With a new filter, you can stick your nose straight in the exhaust side during week 8 of flower and won't smell a thing. Temperatures drop at least 5 degrees from sucking out the hot air and my CO2 levels are relatively high from constantly circulating in house air. On hot days i can turn it up even more to help with the hot air. Works just as good as my big name brand vent fan and for less money. Highly recommend for the value, performance and quality materials used.

This little fan moves some air. I put this in a small green house and it really helps to regulate the temp and humidity.

This fan was pretty easy to set up and once completed, it greatly reduced the humidity and moisture in my basement. The controller is easy to learn and operate. This is a basement must have for humid or hot summer days and wet or dank winter days.

This fan can really move some air. It is easy to install, and easy to operate. It allows for a wide range of fan speeds that you can adjust it to using a dial. It even offers a 12v power output in case you need to chain additional equipment.It comes with an external timer which allows you to schedule when and for how long the fan will operate -- not essential for my use case, but it would certainly be helpful if you were using this for some botanical purpose, or to remove stale air from a basement periodically, etc.Though it does not come with a ventilation duct, I was able to acquire one for very little on Amazon (it takes a 4" duct, fyi), and it was uncomplicated to attach that to the fan.Regarding fan noise, I measured the noise level produced at both its lowest speed settng and its highest, using a decibel scale properly weighted for the human ear (dBA) (and measured at 1 meter from the fan). At the lowest setting, it measured 48dB. At the highest setting, a mere 58dB. Though this range is described as having the potential to cause irritability, focus issues, and sleep problems if a person is exposed for extended periods, it is otherwise relatively low (for reference, a normal-volume conversation inside a home is about 50dB). And for most use cases, having the fan on constantly while also being in such close proximity is an unlikely thing to happen, but I figured I'd provider the information anyway just in case it might affect anybody.Now, with all that being said, I do have some criticisms to make. For starters, there is no button or switch on the fan to turn it on or off. When I noticed that, I believe my thought process was, "Wait, what? Then how do I even use this thing?" Eventually, I realized that to manually turn the fan on or off, you either need to plug/unplug its power supply, or you need to use the provided timer device. Not an ideal situation if the timer breaks, or if you don't really need to use it.And speaking of the timer device, mine arrived with its "M" (mode) button sort of stuck in place. The + and - buttons give a gentle click when you press them -- feedback that lets you know that you've succeeded in pressing the button -- but the M button is having none of that, and the only way I can tell that I've managed to "press" it (I put that in quotes because it doesn't seem to move when I apply pressure on it) is by observing the changes on the display. Not a major problem, but frustrating nonetheless.Another interesting design "feature" is having the fan-speed nob on the output side of the fan. In my case, this means that I need to reach blindly around and feel my way to the dial if I want to adjust the speed, simply because I am trying to move air out of a space, rather than into it.So on the whole, it does work quite well as a fan, and does have the potential to be a great convenience (if you're trying to circulate air into/out of a greenhouse periodically, for instance). But some of the design choices have proven a hassle for me.

So, I like to keep Co2 levels low in my room. I have a portable AC for warm months that does well at lowering Co2, but during cold months I was forced to use a small 140mil computer fan that plugs into a wall outlet and it didn't do great and pulling air. I had to tape it to cardboard to attach it to the exhaust setup the portable AC uses during summer. This right here will make those cold months so much better when it comes to exhausting that Co2. This is pretty powerful and is exactly what I needed. Now, if it stops working too quick or what not I will update this review to reflect that since it's May and it's too warm now to need this.All in all I recommend.

Its very light mostly because its plastic. Moves a decent amount of air too despite the size. Noise is minimal.

I got this fan for my basement as I sometimes get water and may need to have air exchange in that space. I have been thinking of installing a fan in there, but I got this one to see how that will work. For now I will open the window and leave it in when I need it. I like the timer and different speeds on the fan. The air is sufficient but not too powerful as expected. This fan is very promising as is will be working with my dehumidifier in the event of basement moisture.