AC Infinity CLOUDLINE T4, Quiet 4” Inline Duct Fan w/Environment Controls
Condition: New
Buy Now, Pay Later
As low as
$19.83
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Saturday, Oct 24
Recently Viewed
Size: 4-Inch
Color: Pro Smart Controller for T4
Features
- Designed to ventilate hydroponic grow rooms, transfer heating/cooling, cool AV closets, and exhaust odors.
- Dynamic temperature and humidity programming, with timers, grow cycles, scheduling, minimum speed.
- Remotely connect to our WiFi app to access advance programs, view climate data, and set automation.
- Mixed flow design combined with a PWM-controlled EC-motor for a truly quiet and energy efficient performance.
- Duct Size: 4 | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 226 CFM | Noise: 26 dBA | Bearings: Dual Ball
Description
AC Infinity is a technology company that specializes in environmental controls for agricultural and HVAC applications. Our smart controllers and integrated grow equipment are designed to work together to create the perfect climate for your plants. Improve your air exchange while maintaining a quiet and energy-efficient performance. Adjust your climate and VPD from anywhere with the AC Infinity app via WiFi. Download the AC Infinity app for access to custom activation using climate triggers, grow cycles, scheduling, and automation programming. Create automation for your devices to systematically manage your grow tent environment. Set customizable alerts that can trigger to almost any event. Interactive graph intuitively displays temperature, humidity, and VPD data. Input target figures to help your grow tent approach and maintain your ideal environment. Stay on top of what's happening in your grow space using alerts and notifications so you can quickly counteract any environmental spikes. CLOUDLINE PRO T4 CLOUDLINE PRO T6 CLOUDLINE PRO T8 CLOUDLINE PRO T10 CLOUDLINE PRO T12
Brand: AC Infinity
Color: Pro Smart Controller for T4
Electric fan design: Exhaust Fan
Power Source: AC
Style: Cloudline T4
Product Dimensions: 6.9"D x 11.9"W x 7.4"H
Room Type: Kitchen
Special Feature: Programmable
Recommended Uses For Product: Inline Duct Fan
Mounting Type: Downrod Mount
Power Source: AC
Room Type: Kitchen
Special Features: Programmable
Recommended Uses For Product: Inline Duct Fan
Mounting Type: Downrod Mount
Controller Type: App Control
Number of Speeds: 10
Noise Level: 28 db
Wattage: 21 watts
Number of Blades: 10
Air Flow Capacity: 205 cfm
Speed: 2800 rpm
Voltage: 120 volts
Indoor Outdoor Usage: Indoor
Control Method: App
Number of Power Levels: 8
Main Power Connector Type: AC power plug
Motor Type: EC motor
Installation Type: Mounted
Connector Type: AC power plug
Blade Material: Plastic
Specification Met: CE, ETL, RoHS
Color: Pro Smart Controller for T4
Electric Fan Design: Exhaust Fan
Style: Cloudline T4
Collection Name: Hydroponic Ventilation Equipment
Item Dimensions D x W x H: 6.9"D x 11.9"W x 7.4"H
Blade Length: 74 inches
Item Weight: 0.27 g
Cable Length: 144 inches
Size: 4-Inch
Brand Name: AC Infinity
Included Components: item
Model Name: CLOUDLINE T4
Model Number: AI-CLT4
UPC: 854759004785
Number of Packs: 1
Part Number: ACAICLT4
Frequently asked questions
To connect the AC Infinity CLOUDLINE PRO T4 fan with the WiFi app, first ensure you have a stable WiFi connection. Download the AC Infinity app on your smartphone and create an account if you haven't already. Power on your fan and follow the in-app instructions to connect the fan to your WiFi network. The process typically involves selecting the fan on your app and entering your WiFi credentials.
The AC Infinity CLOUDLINE PRO T4 is designed with a robust temperature and humidity controller that can handle the environmental control required for grow tents and hydroponic systems. It monitors temperature and humidity levels to maintain the optimal VPD (Vapor Pressure Deficit) for plant growth and can manage conditions in a wide range of settings.
Yes, the CLOUDLINE PRO T4 is versatile and can be used for various heating and cooling ventilation applications beyond grow tents and hydroponics. It's designed to work in any setting requiring efficient air exchange, such as attics, bathrooms, workshops, and more, ensuring optimal temperature and humidity levels are maintained.
The AC Infinity CLOUDLINE PRO T4 is engineered for quiet operation, featuring a mixed-flow design and a PWM-controlled EC motor. It is well-regarded for its low noise output, which makes it an excellent choice for environments where noise levels are a concern, such as residential areas, offices, and especially grow tents where fans can run continuously.
Similar Products
Top Amazon Reviews
🚀 Abunda's Overview
This is our summary and key points to consider based on customer reviews.
The AC Infinity 4-Inch PRO fan with Smart Controller receives high praise for its quiet operation at low speeds, the effectiveness in air circulation, and easy installation. It has a well-constructed design with multiple control options afforded by the smart controller. However, users find the fan gets noisy at higher speeds and the vibration may require additional isolation. The controller's complexity and lack of intuitive settings can be a hindrance, although once set up, it operates well.
Pros
- 🔇 Very quiet at low speeds, still effective at moving air
- 🛠️ Easy installation with a sturdy mounting bracket
- 🔄 Adjustable fan direction without uninstalling
- 🌡️ Comes with a long temperature/humidity sensor cable
- 🔧 Multiple control options and works seamlessly with corresponding ducting equipment
- 🏗️ High-quality construction with thick plastic casing
Cons
- 🔊 Becomes noisy at speeds 3 to 10, vibrations may be an issue
- 🔧 Controller setup and settings are complicated and not intuitive
- 🧩 Installation in bathrooms or specific setups may need creative solutions for controller mounting and cord management
Should I Buy It?
If you're in need of a versatile exhaust fan with quiet operation at low speeds and don't mind spending a bit of time on the initial setup, this AC Infinity 4-Inch PRO fan is an excellent choice. It is especially recommended for individuals who need a reliable air circulation solution in spaces like home theaters, grow rooms, or bathrooms. Just be prepared for increased noise when operating at higher speeds and potentially intricate installation scenarios.
Size: 4-Inch
Color: Pro Smart Controller for T4
Honestly this things super quiet & i don’t even notice it running in my tent setup. At full blast this thing pulls a lot of CFM & will clear the area in minutes! can be ducted & hung easily in setups!
Reviewed in the United States on August 24, 2026 by Noah
Size: 4-Inch
Color: Pro Smart Controller for T4
There isn't a whole lot of information on this unit. This is exactly what it comes with, and how it works. By the way I'm NOT affiliated, nor know AC Infinity I bought this full price to handle a solar air heater. *EDIT* The below information was on the ORIGINAL 12v Cloudline T4. I bought it again and found out the they've been redesigned and newer models are 24v instead of 12v and NOT compatible with each other (yet look and connect identically I blew my fan plugging the original 12v fan into the new 24v controller). The newer model has more CFM, a longer probe, and has a temperature&humidity probe in one instead of just temperature probe and they've done away with the smart mode feature. Most people would probably welcome the improvements, used for solar heating it's best with the smart mode feature they removed in the new so I ended up returning the newer style and finding another original 12v style. For solar heating, Auto mode of the new would've allowed 2 speeds and switched between them (off, medium, alarm speed) which is okay I suppose... but the smart feature of the original allowed 6 speeds for solar heating and was adaptive to minimizes fluctuations (basically perfect for my solar air heating project) so to me removing the smart feature in the new was devastating. Hardware: The fan comes with a controller, a stencil for mounting said controller, a thermal probe with 8' cord, 4x screws for mounting controller, 4x screws for mounting duct fan, duct fan, 4 drywall anchors, a 2 prong sideways power adapter with 6' cord that converts 100-240V AC 0.8AMax to 12V DC. The controller states Power: 12V DC 4A Output: 12V DC 30W MAX), 6x wire ties, 6x cable mounts, 6x wood screws, 2x 4" duct clamps. The controller can accept 2 fans, as of this review they don't sell another fan separate. I also assume the controller saying 12V DC 30W MAX is with 2 fans attached. The power adapter is small and thin and goes sideways into the wall or surge strip. That means it's one of the better design power adapters that can plug into any outlet of a surge strip and won't block any other outlets nor need to go into the "power adapter" port of a surge strip. The fan uses a quiet PWM motor, 6 speeds, and of mixed flow design. That means it's a jack of all trades kind of fan. Axial fans (think computer fans) have the greatest ability for air flow but poorest ability to overcome static pressure. Centrifugal fans (blowers) have the greatest ability to overcome static pressure, but the poorest air flow of the bunch. This fan is the jack of all trades having both good air flow and ability to overcome static pressure, and likely the most useful for most situations compared to axial or centrifugal. Mixed flow are also the quietest of the different fan types. The fan is IP44 rated (resistant to fluids, dust, heat, and humidity), has dual ball bearings rated to 67,000 hours, the fan can be mounted in any direction, and the thermal probe is stainless steel. The 8' probe cannot be extended nor replaced with a longer as of the date of this review (it has a unique beginning and end), but I had to have the probe 15 feet away so cut the wire to the probe and inside was just normal 2 wire (red/white). I inserted/soldered a 10 foot piece of thermostat wire to extend it, used some shrink tubing and hair dryer to protect it, and then siliconed and had over 20' probe that worked perfect. Installation instructions are clear and illustrated. 1 page is features, 1 page is included hardware, 1 page a diagram, 5 pages installation instructions, 3 pages Power and Setup, 2 pages cleaning instructions, 6 pages programming instructions, 1 page other AC Infinity products, 1 page warranty. The controller displays the fan trigger temp, alarm temp, probe temp, fan speed, brightness (3 settings available), and alert icons (fan failure, alarm, or display lock). The display can be changed from F to C, and maintains settings (in case of power failure). The display can also be turned off and unit still function (by hitting the leaf button). Modes: On = Fans run 24/7 at any of the 6 speeds you set. Auto=Fans will turn on at the speed you set in the On mode once the set temperature is reached. To prevent cycling, it will turn off once it reaches 4F lower than the set temperature (this can be changed to 2F instead). If the Alarm temp is reached the fans will go to max speed and beep every 3 seconds until temps drop below the Alarm temp. Off = No fans Smart = *This mode has been removed and no longer available only the 12v model has it the newer 24v does not* You set the temperature when you want the fan at max speed, and every 4F (can be changed to 2F) the fan speed will lower. This means you put the controller in smart mode and put the temperature to say... 100F. At 80F the fan will automatically turn on the lowest speed (speed 1). At 84F it will go to speed 2, 88F speed 3, 92F speed 4, 96F speed 5, and 100F speed 6. If the alarm temp is reached the fan speed will jump to max and beep every 3 seconds. This means there's a max of 20F between lowest speed and max. Alarm=You set the alarm temp, and when reached the fans will go to max speed regardless and beep every 3 seconds. Only works in On, Auto, or Smart. It can also be turned off. It also can't be set higher than 140F. To lock the controller, you hold the mode button down for 3 seconds. The controller will still function, but pressing anything will cause the lock button to blink only, and not affect anything. Holding it down for 3 seconds again will unlock it. The buffer defaults to 4F or 2C temp difference, but can be set to 2F or 1C. This is a well thought out and built unit. Comes with nearly all the hardware one could need, is easy to setup, the instructions are easy and well illustrated, and the unit is quiet with decent power to overcome static pressure. This is exactly what I needed for my solar air heater. The only odd thing is, the display has 3 brightness settings however it was missed in the manual how to change it. I tried every combo of buttons and holding them down to see if I could change it to no avail. Not that I wanted it dimmer, I was just curious.
...
show more
Reviewed in the United States on November 15, 2017 by Clearlake
Size: 4-Inch
Color: Pro Smart Controller for T4
I'm disabled, so dont have an income that allows me to do much. But I can afford ac infinity items, because you need only purchase them once, and they do what they are advertised to do. I've purchased AC Infinity products, now, for several months, 3 gallon grow bags, the 4" inclined fan and controller, air plates, and several other of theyer fans to control the small closet I've turned into my grow room. I will get self watering systems, soon hopefully, but ac infinity does all the work for me, and soon all I'll have to do is watch them grow. I still plan on getting the 2x2 tent they offer, soon, and will gett more fans, still, and a dry tent. Theyer products are exceptionaly made, quiet, and energy efficient. Im not a professional grower, but AC Infinity, makes me feel like I'm on the right path, with the choices I've made. I will continue to by my products from AC Infinity till a better product line comes along, offering better quality, and user friendly products. I dont see it happening any time soon, so I'm very happy with all I've purchased from AC Infinity. The 4" inline fan works and move so much more air than i thought it could displace. And its so quite. The controller makes every thing almost plug and play. Easy to understand directions, witch i definitely needed, but instructions walk you through it. And theyer are hundreds of you tube vids, to help walk you through it, easily. AC Infinity will continue to be my go to choice for my grow room. My grow Loves them, and I Love what I grow, so my choice has been made for me. Bit it's really just comman sence. Thank you, AC Infinity, for maken my life easier. A very happy and satisfied customer.
...
show more
Reviewed in the United States on October 5, 2022 by Bo
Size: 4-Inch
Color: Pro Smart Controller for T4
If you are reading this you are probably searching for grow equipment with a budget in mind which can be confusing, but rest assured this is an awesome deal. This includes the 4 port model 69 controller w/ temperature probe which retails for $99 just by itself. So basically for a little more money you also get the exhaust fan. Using this and adding a UIS compatible AC infinity grow light and circulation fan you have the ability to control the entire setup via the wired controller or wirelessly via Bluetooth/wifi from the app. You also still have one UIS port left over on the controller for a humidifier, heater, etc. The ventilation fan itself runs super quiet and does not produce noticeable extra heat. It is also very energy efficient. All hanging and mounting hardware is included with multiple different options for installation. Be advised ducting for the fan is not included but can be purchased separately, any 4” diameter air-dryer hose will work. ACinfinity is known for their excellent fans and this is no exception. User manual is also very clear and easy to understand. All told this is absolutely a great deal and a great first component to your indoor garden.
...
show more
Reviewed in the United States on December 6, 2025 by Matt G.
Size: 4-Inch
Color: Pro Smart Controller for T4
The AC Infinity Cloudline Pro T4 has completely transformed my grow setup. The highlight is undoubtedly the advanced smart controller, which gives me full control over humidity, temperature, and even air pressure. It’s like having a personal assistant for my grow tent! The automation features are incredible—once you set your desired parameters, the fan adjusts itself to maintain the perfect environment without any manual intervention. The fan operates quietly yet delivers powerful airflow, making it ideal for any controlled environment. The controller’s interface is user-friendly, with clear readings and precise adjustments. I love being able to monitor and tweak settings remotely through the app—it adds an extra layer of convenience and peace of mind. This fan not only ensures optimal conditions but also helps save energy by running only when needed. Whether you’re growing plants, ventilating a space, or managing a server room, the Cloudline Pro T4 is in a league of its own. I couldn’t be happier with this purchase. Highly recommend it to anyone who demands precision and reliability!
...
show more
Reviewed in the United States on November 29, 2024 by todd brock
Size: 4-Inch
Color: Pro Smart Controller for T4
Update 6/25/18: After observing the unit in operation for a few weeks, I've dropped my rating from 5 stars to 4. Don't get me wrong, I still like this fan very much, and I don't think there's a better option out there. But the issue of controller fluctuations at "borderline" temperatures is looking like it may be more troublesome than originally thought. At first, I was just noticing the fan fluctuating between two speeds if the temperature was right at the transition mark, and although the manufacturer should have included a better way to handle this in the controller, I doubt it will be a problem. More concerning, however, is when the temperature drops several more degrees (like at night, when the A/C is turned cooler). The unit reaches a point where, instead of fluctuating between two speeds, it fluctuates between the lowest speed and OFF (in other words, the fan turns off and on over and over again). This may very well lead to premature failure of the fan. So, I'm trying to figure out a comfortable setting that allows the fan to operate at the various speeds to maintain a good temperature in the closet, while also not turning off and on repeatedly when the ambient temperature drops. Original: Bought this to assist in ventilating a small network/server/media closet that was getting quite warm once I moved equipment into it. I installed a return air grill in the ceiling (tied into to the central HVAC return air), and just that alone was bringing the temperature in the closet to a tolerable level, but that's largely because it's Summer and the AC is running regularly (which draws cool air into the closet from under the door, up through the return air), though not without some temperature fluctuations between AC cycles. So, adding this fan is probably a good idea anyway, but what I really need it for are those months in Fall and Spring when the AC does not run much. There are definitely cheaper options, but I wanted something that wasn't going to be noisy, and this fan seemed to be the best choice in that respect. I don't absolutely need the fancy temperature controller, but I also don't mind having it. Rather than the fan running full blast all the time (or having me having to manually adjust the speed periodically), I like how I can set this fan in "smart" mode where it gradually ramps up and reduces the speed as conditions require (with a maximum speed that you can designate), even shutting off completely if the closet gets sufficiently cool. I have absolutely no complaints at all about noise. There's a roughly 6ft. run of 4" flexduct to the return air, and I placed the fan in about the middle point to minimize the chance of noise. Obviously when cranked up full power, there's some "wind" noise present if you open the closet door, and to a lesser degree near the main return air grill where the closet duct is tied into, but it's not at all offensive or prominent, and blends in with the other noises of the house. At middle speed and below, it's barely noticeable. And again, the great thing about this unit is that you can set it up so that higher speeds are not reached unless absolutely necessary. I did see some other comments about how this unit can "resonate" with the house framing that it's mounted to, but in my particular case, the fan itself is supported by the flexduct, and also rests on top of insulation, so it's not mounted to framing. A review also mentioned an issue of "shoulder" temperatures, with the fan speed sometimes fluctuating up and down as the temperature flips back and forth between, say, 81 and 82 degrees (if it's right on the border of those two temperatures), and this does indeed happen. In my case, it's not noticeable in operation, with the only evidence of it being seen by the fan speed indicator on the display, but the manufacturer should consider adding a "buffer" of a half degree or so between fan speed changes in smart mode.
...
show more
Reviewed in the United States on June 12, 2018 by Michael
Size: 4-Inch
Color: Pro Smart Controller for T4
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.
...
show more
Reviewed in the United States on May 31, 2023 by Jim
Size: 4-Inch
Color: Pro Smart Controller for T4
I purchased this fan to exhaust warm air from a home theater equipment rack. With all the equipment turned on, the temperature in the rack quickly climbs to over 90 degrees. The equipment rack is recessed into a closet under a set of stairs, so goal was to activate the fan to pull warm air out as soon as the temperature rose to 80 degrees at the top of the rack. With the controller, it can be set to automatically and progressively increase fan speed after the temperature hits the target. Every 2 degrees after the target the fan can increase speed by 1 step. PROs: > Very quiet at fan speed 1 and 2. At 10, this fan pushes a lot of air. > Controller allows multiple control options - I just needed the high temperature option > Easy to install with the mounting plate - I got this mounted and installed in under 30 minutes. > Fan direction can easily be changed. The fan module just pulls out and you can change airflow without uninstalling - this is great to test whether pushing cold air in vs. pulling warm air out works better for your application. > Nice long temp/humidity probe and cable let me place the sensor exactly where I needed it. > Ability to place the controller wherever you want it as well. > Works seamlessly with their matching 4-inch flexible ducting, and wall mount duct grille. > Comes with two duct clamps > High quality construction -- strong mounting bracket, and thick plastic casing. CONS: > At speeds between 3 to 10 you definitely know it is running, though it is probably quieter than other fans. > I have this mounted to a wood support. At high fan speeds the motor vibration does reverberate through the wood supports - so need to play with how to isolate the fan if noise is important. > Controller settings are very complex given what you would typically want to do. To set the fan to turn on at 80 degrees and increment speed in steps as temps rise took a bunch of menu hopping and instruction manual reading -- not intuitive. In contrast this was a very simple setup on their AIRCOM fans. > Don't like the fact that in AUTO mode, multiple sensors can affect whether the fan turns on... Took a couple days to dial it in. High temp, low temp, high humidity, low humidity... hard to predict when the fan will turn on... I get this is geared for agricultural use, but setup is more complex than it needed to be.
...
show more
Reviewed in the United States on March 2, 2022 by Brunob00