AC Infinity CLOUDLINE PRO T4, Quiet 4” Inline Duct Fan with Temperature Humidity VPD Controller, WiFi Integrated App Control - Ventilation Exhaust Fan for Heating Cooling, Grow Tents, Hydroponics

This is really an impressive package from top to bottom. I've been buying AC Infinity products for many years now and have always been completely satisfied with everything, this is no exception. The difference is this is the largest, most important, and most expensive thing I've ever bought from them. I bought the 12" Pro fan to use as a return booster fan for my home's ducted heat pump. I wanted it particularly to boost the return air upstairs in my house to assist with cooling and dehumidification because it gets so much warmer on the second floor. I programmed it to always be running at minimum speed, trigger at 70F and then increase in speed by 1 notch for every 1 degree F rise in temperature beyond 70F, up to a maximum of speed 8. It will also revert to minimum speed at night, regardless of temperature. Setting all of this up was very easy in the app. I didn't even attempt it with the controller because I could tell it would be much more difficult. My recommendation is...just use the app. It was incredibly easy to set up and only took a minute. The quality of the fan is superb. I actually bought spring vibration isolators to mount it on since I installed it in my second floor in a crawl space (just sitting on the floor). I wanted to make sure vibration would not be a problem. However, it turns out I didn't even need the springs, the fan runs so smooth that there is no vibration or noise transmission through the house at all, even on the higher speed settings. The air noise gets loud on the higher speeds (7+), but the fan still runs so smooth that it is virtually silent downstairs. This is very impressive for a fan like this. About the package contents...you get a LOT. Way more than you will actually need. They include VERY long cables (the temp/humidity probe is about 25 feet), several different mounting options including a strap for hanging it and heavy duty screws, two 12" duct straps, and a bunch of zip ties and accessories for cleaning up the cables. All in all its a very impressive package. They do make duct fans of equivalent size that are capable of moving a lot more air than this, but those are very expensive commercial/industrial units and do not include this level of controllability and customization out of the box. If you want or need something like this for your home I can confidently say this is the best option on the market. I can't yet comment on longevity, but this fan will be running continuously in my home from now until November, so we'll see how it does. Based on my experience with several other AC Infinity products I own, I expect this thing will run perfectly for many years without issue. But I will update this review accordingly.

I had been on a hunt for low power high CFM fan. I researched on centrifugal fans, mixed flow fans, EC fans. Giving the power consumption and features I settled with this one. Packaging was impressive and the parts themselves reek of quality. DC fan with Dual ball bearing fans are a welcome :). Parts included are; thermostat-controller console, temperature sensor probe, power brick, fan unit, 2 x ducting clamps The fan itself is much lighter compared to other AC fans (not surprising given the fact that power delivery is through a brick) Operation was fairly straightforward once you get used to controls on the thermostat/controller console. I have been using two of these (intake+exhaust) to cool off a mining rig and I am quite content with the performance. I have tried Active Air 6" centrifugal fan rated at 400 CFM. Though being a quality product, was too loud and consumed 105 watts. These are rated at 350 CFM at 40W with added benefit of thermostat control - smart operation. The fans are tad loud at high speed (speed 5-6) but not even close to other fans out there. Speed 1-4 are quiet for my taste. Following are the numbers captured from my test (see image below), CFM measured by converting from Ft/min unit measured by UT363 power consumption measured at the wall using Kill-A-Watt meter Noise captured using a cellphone app measured 3ft away from the fan (probably unreliable but you get the relative idea; active air used to be 85dB+ on this app) Electricity savings per month (considering 10 cents per unit) 40w vs 100w $3 vs $7.2. That's a $4 saving in a month from a single fan. Much more with when the speeds are lower and automatically controlled using thermostat-smart operation. Other thoughts Since this is a mixed flow fan it might not be good to have lots of bends in your ducting. For long ducts with bends, centrifugal fans are much more effective. My exhaust fan didn't suffer from reduced CFM due to bend when I ran it through a 6ft 6" ducting. CFM on intake end reduced by 40% because of filter. (YMMV) Warranty could have been at least 3 years because in comparison others do provide 3,5 or even 10 years (Vortex). However, arguably there are more points of failure for this unit.

This is the second one I have bought over the last 3 years. The first one I bought was the 6" blower and I placed it on my Barndo to element negative pressure due the the building being spray foamed. It works great. The second one I bought is the 10" on my goodness at the air it moves. I put it on the main line feeding my game room that is completely on the other end of my house. That room has always been running 5 to 7 degrees warmer the the rest of the house. We could hardly feel any air coming from the vents. After installing it you can feel the movement of air and it cooled the air down to rest of house in about 10 minutes. I have it in auto and have it so it stays on setting 2 100% of time and ramps up as needed. You can't hear the blower at all. Supper quite and highly recommend.

After using for one season, I have to say I am impressed! I paired this fan up with the CloudForge T3, and between the two I had a utopia in my tent 24 seven! The AI works great. You just have to set your limits for the units you are using. Example, I ran the fan with a max level of six and the humidifier with a max level of three. Everything was perfect.

Overall I’m really pleased with this fan. I’m building a post and beam house and there’s no room anywhere for an air handler system. This compact fan and filter box fit nicely under the stairs and can move a lot of air. The only issue is noise. The fan itself is quiet but the air is loud due to the ribbing of the flexible tubing which creates a lot of wind noise at higher settings. Overall it’s not a problem for us because we like white noise and can generally run the system at a lower setting. The WiFi control setup was easy and works great. For a DIY setup this works great.

Overall this is a really well-built inline duct fan. On its lower settings (less than 5), it's quiet, but then it starts to get a bit louder. I have 2 of the 6" units, perhaps the larger diameter models are aless noisy as they can move more air thru the larger duct. I really like the efficiency, and volume level of these units in general. The controller is also nice with several programming options for automatic control, but this is where it could really use some tweaks to make that 5-star rating. First, the controller has a high & low temp, and high & low humidity threshold where it will turn the fan on. This is nice for your generic uses, but when you want a little more of a comparative control, or if you want an "OR" activation (for example, turn on above 80F OR below 60F), it can't handle that. You can set EITHER above or below, or you can set a range in the middle, but you can't set BOTH above or below at the same time. Next, there needs to be a variable speed "idle" state. For example, if I set the threshold of "Speed 6 above 80F", I would also like to have an "idle" state of "speed 3 below 80F". But this is not an option. It's either on or off, not fast or slow. Next, the controllers are capable of running 2 blowers, but they have to be on the same program. So, I have to use 2 controllers because I have my 2 units doing different things. It should be very easy to have 2 "programs" running, with different variables, and allow that single controller to operate 2 blowers independently. There needs to be smart technology integration. This is a big one today! With smart home and voice assistants on the rise, there is absolutely no reason this system could not be integrated! build an app with the same display as the controllers, allow the user to control the units, change settings, or put in temporary conditions. Allow for overrides, and sensor integration with conditions like "run program A unless sensor detects rain, then run program B" Integrate with Samsung SmartThings, Alexa, HomeKit, Google, etc. Right now, I have no remote controlability for these blowers, or if I want to do anything with them, I have to go to the basement and work on the wall-mounted controller. So again, they're great blowers, but they need those little tweaks to really get that 5-star rating!

I am writing this review for two reasons. The first reason is the Cloudline T4 fan unit itself, and AC Infinity's awesome customer service. The second reason is the title of the review. I am not using this in a grow room, but in an encapsulated crawl space as an exhaust fan. This fan is outstanding. It was easy to install and setup. For my use, I just have it strapped to a short cinder block and sitting on the floor of my crawl space. I have a Vivosun duct cover over the intake, as the intake is not connected to anything, and I didn't need a carbon filter for my application. I then have the AC Infinity 8' ducting connected to the hard duct that exhausts to the outside. My Fantech FR-100 was pulling way too much air, causing too much negative pressure in my townhome, and causing too much noise, mainly from bad mounting and thus vibration noise. The FR-100 was literally shoved into the hard duct, sheet metal screwed on, and then duct taped. Basically, just hanging there off of the hard metal duct. Anyway, I was wanting to know the CFM ratings per fan speed settings, and AC Infinity support was awesome, quick, friendly, and got me that information fast through their chat. The other issue I had, was the FR-100 was way too close to the inside floor intake vent, about 5' away. This made for uneven temps in my crawl space due to lack of air circulation. Air pulled into the crawl space and exhausted right out. With the T4 and ducting, I was able to place the fan much further from the intake making air circulation better and thus I now have more even crawl space temps. My crawl space is small, about 250 ft, and per code, only needs about 5 CFM. Setting 1 is about 45 CFM, and I am currently set on level 4, about 100 CFM. This in part due to the dust cover lowering the actual CFM and a backflow air valve on the intake from the house. I need to create enough pressure to make sure the valve opens and I was testing a few things. I will like lower the level to 2 eventually. Anyway, this Cloudline T4 fan, is truly whisper quiet. At 10, I am sure there is some noise, but in testing up close, from levels 1 to 6, you could barely hear it at 4 - 6. Overall, I am super impressed with the Cloudline T4 and its smart controller (which I will be upgrading to the WiFi model).

I just found out this package came a few days ago with a AC Infinity 69 "Pro" controller!!! Very satisfied with this. I don't know what all the Pro has above and beyond the regular 69. I do know one thing is the vapor pressure deficit. Let me do a regular review and then I'll mention VPD again. OVERALL Overall I'm very happy with this system, it's letting me play mad scientist and create my own environment while doing something I love, growing plants. Tomatoes, sage, bamboo currently. It's a tiny bit noisy (see the humidifier section), so you probably don't want it in your bedroom if a little clicking is going to keep you awake. FAN I've had this setup a few days and I'm mostly satisfied with it. The fan is nice, it doesn't feel like it pushes that much air but for a smaller space it's adequate, I use it on a 2x4 space. The fan bracket keeps the fan pretty close to the bracket so depending on your installation you're going to be stretching to get the bolts into the holes. It works in the end, but clearances are tight. Make sure you account for any ducting that attaches to the fan in your install. CONTROLLER The controller is the star of this show. I was looking at the controller and saw this extra number on the screen that wasn't in the AC Infinity 69 manual. It's kPA, kilo-pascals. I did a little googling and realized I had the Pro controller! This kPA number measures the vapor pressure deficit. It basically means you need to keep your humidity in your grow space up around 60-70% to get your plants in the zone where they don't spend their energy in transpiration. Basically, when there's not enough water vapor in the air, plants will emit water vapor. If you have a high VPD you're watering your plants more than needed and they are working hard producing nothing but effectively sweat. Otherwise, if you're not used to thinking in terms of a state machine, you'll find this controller confusing. You have to cycle through several modes and then press non-intuitive buttons to program the thing. You'll be referring to the manual often, which is fine. This is actually a pretty powerful little controller, it does so much! The only thing it doesn't seem to do, which the docs seem to say it will do, is to have the fan respond to two inputs. Supposedly you can set the high temperature threshold in that mode, then cycle to the mode for high humidity and set that threshold. Then in theory the fan will control both head and too much humidity. (I'm not worried about humidity during the "day," it's at night when the plants transpire in the dark I want the humidity controlled. This controller doesn't seem to do both. ECOSYSTEM Don't forget, unless you buy all your parts from AC Infinity, you'll need some of the AC outlet controller boxes. I needed three, two for my Mars Hydro lights, and one for my cheapo humidifier. These boxes are $20 each as of this writing so that's another $60 laid out to get this system working. HUMIDIFIER Just a final note, you can really skimp on the humidifier. You don't need warm mist, and you need a non-computerized one that simply starts up when the power is applied, without the user intervening. I found one for $25 and there was a Amazon Warehouse deal for $16. It came with a couple hairs yuk gross but I save $9.