AC Infinity CLOUDLINE S4, Quiet 100mm Inline Duct Fan with Speed Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics, 4-Inch

Brought it to attach to my Glowforge exhaust ducting. It is such an improvement on the noise level previously. I’ve mounted it on the wall, and that was easy enough to manage too. Would recommend it to anyone wanting something for a similar reason.

Works well

fantastic product,exactly what i ordered

It does its job, obviously full speed it sounds like a turbo slightly but if you run it a few notices under full power then it's almost silent, I would reccomend this to anyone! Perfect buy, easy to install and away you go!

Not as quiet as made out to be 35db at half power but is quieter then cheaper fans but the overall design and finish is miles better than my old fan

Realy good ......does a good job realy pleased..for the prices well made 10 out of ten

Extremely quiet on the lower setting. A bit more expensive than normal inline fans, but if you want piece and quiet it could be worth the investment

Recommended !!

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.

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.