CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics

Sorry I didn't take pictures of the unboxing because this thing is packaged so well in terms of padding and just an overall esthetic that you get when the packaging wows you. Phones are a great example of this esthetic and this purchase was the same - just like "Oh wow...". I probably did not need this nice of a fan, but after reading the reviews, I thought it might not be a bad idea to step up to something that was so highly praised. And the reviews are not wrong, this is very high quality at a reasonable price. It is powerful and very quiet, although noise is not something that is going to bother me in the greenhouse. As others have noted, the installation felt weird because you need to take out the middle bit to screw down the base, but it makes sense it would work like that. The clamps are quite sturdy and fancy looking. They work well to snug up so that there won't be any vibration. Using it in my teeny little greenhouse, just one day's worth of experience. It didn't bring down the temperature right away, not as much as I hoped anyway. The little greenhouse that could goes well past 100 degrees some days, when it's not even hot outside. I don't have an inlet (yet), but I do have a gizmo that raises the roof vent when it gets hot. Oh well, TMI, here's a pic. Nice fan, buy it!

This is my third, and likely last, exhaust fan I've bought for a project. I wanted an exhaust system for our cat's litter box cabinet so that it would create a small amount of negative pressure and pull the bad odors outside. This fan is absolutely perfect in every possible way and has far exceeded my expectations. I arrived at this fan, after purchasing two others that were just too loud, as the noise seemed to bother the cat. I installed 2" PVC in the wall behind where the cabinet is, because I needed something small enough to fit. I then had a 90 degree elbow coming out of the wall, through a cover plate and then going into the back of the cabinet. In the attic, I installed a 2" to 4" duct adapter onto the 2" pipe, ran 25' of flex duct to this fan, and then another 16' run of duct to the roof vent. While the first two fans where very noisy, even at the lowest speeds, this one is virtually silent. I'm running it on level 2 and cannot hear anything inside the cabinet or in the house. Since I'm restricting the intake to only 2", anything above level 2 would likely just be a waste of power. This setup is working perfectly and creates more than enough exhaust to do the job and it does it in silence. The prior fans moved the air ok but had a really annoying hum that could be heard through the ductwork and also inside the house through the insulated ceiling. I hear nothing with this one. In addition to the above, the fan is rock solid and came with EVERYTHING one could possibly need to install it, including hose clamps. It's almost overkill but shows attention to detail. It also came with a very nice instruction book (yes, it's a substantial book) with detailed instructions on every aspect of installation and operation. The speed controller is very nice and easy to use. I just set it to my desired level and forget it. It will remember its current setting and resume after a power outage. This fan cost a bit more but is absolutely worth every penny paid. The difference in quality and quietness cannot be matched. I could not be happier, cat is happy, and we have an odor-free home.

This review is for the 4" version of the AC Infinity CLOUDLINE PRO, also known as the S4. My son had received a Falcon A1 Laser Engraver from his wife for Christmas and I offered to create a custom exhaust setup for it. They have a young child and what I had read about the possible toxicity of laser engraving fumes (specifically for leather cutting and engraving) motivated me to get the fumes completely out of their house and garage. After a few hours of research, I zeroed in on this CLOUDLINE PRO S4 for the task, as well as some 4" flexible duct and a silicone elbow/reducer (4" to 3", also found on Amazon). I was not disappointed with the results! See my two photos. I'm very methodical and careful, so it took me a few hours to complete the system, but most of that time was spent sawing through the garage drywall and configuring the termination of the duct at the roof's soffit. My observations: The inline fan is fairly big, but lightweight and is very easy to secure to the wall with the included mounting bracket. It's very quiet! The ten-speed variable control will take it from too quiet to hear, up to a whisper, and finally to a slight swooshing sound at full speed. I was impressed with the air volume it moved. I could definitely feel the air coming from the outlet outside. It reminded me of the volume of air a clothes dryer would produce. Sure enough, with a rating of 205 cfm (likely measured without ductwork), this fan compares to the average clothes dryer exhaust of 150 - 200 cfm. A bonus for the setup I installed is that garages are very leaky and exhausting this much air will bring a similar amount of outside air as "makeup air" and will create a cooling effect for the garage when it's hotter inside than outside. Everything I read online indicated that AC Infinity made good quality inline fans and I got the same impression working with it. Even the packaging and "presentation" upon opening it was far nicer than I had expected. I would definitely buy this brand of inline fan again the next time I need this type of ventilation.

This thing is fantastic! I use it in my enclosure for a laser engraver. It's a lot quieter than what I thought it was going to be. It pulls air incredibly well. I have it sitting on top of a desk, and it stays put. It doesn't move around while running, even on high, which tells me that it's well balanced. I like the little remote, too. It makes it a lot easier to turn it on and off. 4-in hoses and clamps fit really well and don't slide off, which was my initial concern. I highly recommend.

I think the fan is a good quality product and sufficiently small to tuck away between the floor joists as shown in the pictures. I'm using it to move cold air from the basement (~65F) to the top floor of our house (~75F) and use the AC less as well as make the whole house a more even temperature. It was fairly easy to install and they did a good job including all of the parts that you will need to mount it in most locations. The unit is powered by a small transformer (think cell phone charger size) that feeds the speed controller. The speed controller is then linked to the fan by a seperate cable. In totality the combined length of these cables is over 20ft. Currently I have the 4" fan driving a single 3" vent to our bedroom (that was all I could get between the walls. but I will be adding a second 3" vent soon). I found the noise start to be intrusive at the bedroom end of the duct (~20ft away) at around a speed of 5-6, although I think this will go down when I add the second 3" vent. At the fan end the intake is quite noisy at a speed of 6. I put about 1 ft of insulated flexible 4" duct over the intake and this reduced noise considerably but I can still hear it through the floor from the room above. I may have to try using some rubber mounts and cut down the vibrational hum. To be clear the noise is mainly coming from the air intake, not the fan motor and bearings. Overall I am quite happy with the fan but it is not perfect. Things I don't like. 1) The speed control is a case of form over function. It looks really nice, but to go from a speed of 7 to a speed of 6, I have to press the button 7 times. A seperate On\Off and Increase\Decrease speed would have been preferable. 2) I would also have liked a way to be able to control the fan speed remotely. Although there is a lot of cable to place the controller of a seperate floor I had a more automated approach in mind. Overall I'm pretty happy though and would buy again. I'll update my findings on the noise after I hook up the second duct which will reduce the back pressure on the fan and should make it quieter.

This inline duct power vent does an outstanding job of removing ALL smoke out of my laser enclosure. It’s very quiet and easy to install. I used 4” plastic dust collector pipe and mounted the CLOUDLINE PRO at about the midpoint. It’s about a 35 foot run. If I didn’t have this system cutting with my laser in the basement of my home would be impossible.

Replaced multiple bathroom fans in my house with several of these. Everything about it feels premium. The packaging is nice, the hardware feels like it could be mounted on an aircraft, speed control is smooth, it remembers the speed you set it on even after a power interruption (meaning you can control it from a regular wall switch without loosing your preferred setting), and I've had one in my 120*F texas attic running 24/7 for more than two years and it hasn't missed a beat - and most importantly is still quiet. No rattling or squeaking. This is the one to buy. Worth every penny. And costs less than the "quiet" bathroom fans at home depot, is quieter, and moves more air. If your attic is accessible it's a piece of cake to cut it in line with the duct and hijack the power going to the original fan. Takes less than an hour per bathroom to retrofit for someone with DIY experience and some hand tools.

This seems to work perfectly, exactly what I was looking for. Thanks

パワー感は、どうかな？ と、いった感じです。

These fans ( I bought 2 - 4" and a 6") are amazing, the process was slick and efficient, it came in its original packaging and the seller sent them to Amazon ASAP!!! I will most def buy from them again, in fact I probably need 2 more, sooner than later.

-It comes with the right power plug for EU(for 220v), even if the original images of the product don't show it(i think they are old), it looks like in the past wasn't the case because of others reviews, but now it comes with the right power plug -The cables are long, i mean, looong(power and controller cables), 2,5 meters for uis cable and 2,3 meters for power cable -I took photos of the manual only so you can see: +installation in different scenarios +cleaning +you can see its an actual useful manual +and the warranty part makes me feel like they really care -It comes with every screw, strap and little thing you need to install it in all possible scenarios(see the photos) -If you want to get noise test you can go to amazon.com(eeuu version) and see the videos on the reviews, my phone mic is trash so I wont do a noise test, but I can tell you that at level 1(it has 10 levels) makes 0 noise, at level 5 its the maximum I can deal with(and need) and above looks like its for scenarios where you really need to ventilate and dont care about the noise, so it gives you options, from 3 to 5 in my case is enough(I will never go above most likely) -I like the philosophy of "its yours, you have the control: you can fully open it(normal screws), you have all these intensity levels(from 1-"it barely moves" 2-"quiet and performant" to 3-"hold on to something, this airplane its gonna liftoff", you have a detailed manual, you have long cables, in the box you have all needed screws and little things" -btw the fan is exposed...not a bad thing, its made for people that think a bit

This fan is fantastic in build quality and functionality. If you need to move air this is a great buy at a great price compared to others. It is super quiet and the long chord on the controller is a nice feature. It looks great and you can tell by handling it that it is a quality made fan. ***UPDATE May 2021*** This fan has worked so well for me non-stop for 7 months that I needed another one and I bought the exact same fan. In fact, I started out cheap, and bought a different manufacturers fan first to save $30, and it was so loud that I returned it ASAP and bought another one of these AC Infinity fans. Two things about it you can't beat, for a 4" it moves air very well. And second, it is the quietest fan I've found of this type. Some may say it gets loud on high settings, it's moving air, it needs to make some noise. But you don't hear the noise of the motor, you only hear the noise of fast moving air. Love it. I'll never buy another brand again.

Me llegó a tiempo, excelente extractor de aire, viene con todo lo necesario para su instalación y con folleto, volveré a comprar sin duda, gracias AMZN