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
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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: 205 CFM | Noise: 28 dBA | Bearings: Dual Ball
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: App Operable, Remote Controlled, Water Resistant
Recommended Uses For Product: Inline Duct Fan
Mounting Type: Downrod Mount
Power Source: AC
Room Type: Kitchen
Special Features: App Operable, Remote Controlled, Water Resistant
Recommended Uses For Product: Inline Duct Fan
Mounting Type: Downrod Mount
Controller Type: App Control
Number of Speeds: 10
Noise Level: 28 Decibels
Wattage: 21 watts
Number of Blades: 10
Air Flow Capacity: 205 Cubic Feet Per Minute
Speed: 2800 RPM
Voltage: 120 Volts
Indoor Outdoor Usage: Indoor
Control Method: App
Standby Power Shutoff: Energy Efficient
Is Product Cordless: No
Number of Power Levels: 8
Main Power Connector Type: AC power plug
Motor Type: EC motor
Installation Type: Mounted
Connector Type: AC power plug
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: 0.01 Ounces
Cable Length: 144 Inches
Size: 4-Inch
Brand Name: AC Infinity
Included Components: item
Model Name: CLOUDLINE T4
Model Number: AI-CLT4
UPC: 854759004785
Part Number: ACAICLT4
Material: Plastic
Blade Material: Plastic
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.
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
The AC Infinity exhaust fan is a top-notch choice for anyone needing effective ventilation. It’s incredibly efficient at moving air and keeping spaces cool, which is perfect for managing heat in various settings like grow tents or workshops. The fan operates quietly, a major plus if you're sensitive to noise, and the build quality feels durable and reliable. Installation is straightforward, and the adjustable speed settings allow for customized airflow. Overall, it’s a well-engineered product that performs exceptionally well, making it a valuable addition for maintaining optimal conditions in any space.
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Reviewed in the United States on August 8, 2024 by J. Norton
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.
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Reviewed in the United States on December 6, 2025 by Matt G.
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.
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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.
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Reviewed in the United States on March 2, 2022 Reviewed in the United States on March 2, 2022 by Brunob00
Size: 4-Inch
Color: Pro Smart Controller for T4
I think most of us know what we're getting with AC Infinity inline fans by now. They're top of the market for a reason. I finally upgraded from my old DC powered fans to these new EC models. Noise and power seem to be about the same, but this controller and app ecosystem is brilliant and I'm not gonna say no to higher efficiency. I was shipped the correct controller with mine (Controller 69) in December 2022. The sensor seems accurate and is VERY fast to respond. I have an inkbird controlling my humidifier set with a 1% tolerance. AC Infinity sensor shows a 10% fluctuation. The inkbird is slow to turn on and slow to turn off. Can't wait till the UIS outlets are back in stock to tighten that window. The app took a few minutes to get the hang of, but it has everything you need and works perfectly. All readings are updated in real time, without a delay. Every port can be programmed for different times of the day. They can be triggered by environmental changes or on a cycle. UIS capable fans can ramp up and down and outlets offer a deadband. Highly customizable. It doesn't have wifi, but the Bluetooth range is exceptional. I can view readings from several rooms over and even on another floor. The controller had an unexpected magnet, and my tent happens to be right next to my fridge. Perfect! Overall, I'm very impressed. I had previously tried a Niwa Grow Hub and everything about it was underwhelming and frustrating. I had no real control over anything. The UIS platform smokes grow hub in every way and is cheaper AND comes with a fan. One note, if you have advanced automation programmed on each port, be sure not to leave the app/controller set to All. Your individual port programs will not run. Your physical controller screen corresponds to whichever port you've selected in the app. If you exit the app with any of the ports chosen, all of your port automations will run, regardless of which port is currently being viewed. The important thing is just don't leave it on All.
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Reviewed in the United States on December 6, 2022 by zKi Comp
Size: 4-Inch
Color: Pro Smart Controller for T4
I use an AC Infinity Cloudline 4-inch fan to ventilate my crawlspace. It successfully reduced my radon levels from 4 to 2 pCi/L — a significant improvement. I purchased and tested two models: the **Cloudline A4** and the **Cloudline Pro T4**. The **A4** is the more affordable option. It comes with everything needed to connect it to ducting, including a simple hardwired controller with a generous 10-foot cable. The **Pro T4**, which I ultimately installed, includes a more advanced controller that supports multiple fans, connects to Wi-Fi, and can be managed through a smartphone app. Like the A4, it’s hardwired to the fan. The smart controller works well, but it’s clearly designed for indoor growers — a bit overkill for my simple crawlspace ventilation setup. Still, I prefer the Pro T4 overall. It seems quieter and runs smoother. Using an iPhone app, I measured about a 10 dB noise difference between the two models, with the Pro T4 being quieter. That may not sound like much given the 90 dB reading at full-speed, measured close to the intake, but the Pro T4 produces a sound frequency that’s less harsh to my ears. Another notable difference is power draw. According to the attached labels, the A4 uses up to 35 watts, while the Pro T4 draws only 28 watts. Average consumption, according to the labels, differs even more — 14 watts less for the Pro T4. That may seem minor, but it adds up when the fan runs 24/7, year-round. Overall, I like the AC Infinity fan. It produces a good airflow and it appears well made. However, I’m deducting one star for the noise level being higher than advertised — those specs likely refer to the lowest speed setting, which isn’t useful for my application. I also found the Pro T4’s manual lacking; it took some trial and error to understand the controller’s features since the documentation wasn’t much help. Recommendation: I initially installed the unit by screwing it directly to the joists, but the running noise was noticeable in the room directly above. After switching to the provided mounting straps and creating an approximately 1-inch gap between the fan and the joists, the noise became practically inaudible in the room above. I highly recommend this installation method. Disclaimer: I am a regular paying customer and did not receive any incentives from the seller or manufacturer.
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Reviewed in the United States on October 30, 2025 by GW
Size: 4-Inch
Color: Pro Smart Controller for T4
Decided to replace an older bathroom fan in our downstairs bathroom. The heater had failed and it honestly sounded like a freight train when you turned it on. My son wouldn't use it because of how loud it was and how little air it moved. Shopped around at the local home improvement stores and tested all of the standard models and none of them were really any better. If they were quiet they didn't move air, if they moved air they weren't quiet. Ran into a post about the AC Infinity line. Although they were designed as grow house fans the ratings were outstanding and they met my two requirements. Move a lot of air and do it as quietly as possible. Ordered the T4 and it came packaged amazingly well with great directions for the use of the remote control. Hooked it up on the kitchen counter and man, it was quiet! Also moved air like crazy. Sure there is always going to be some noise and vibration when you have it on full speed, but when you run it at half speed you can barely hear it and it will clear out a standard 8x10 or smaller bathroom of moisture in just minutes. A few notes on installation for a bathroom. 1. These were designed to be used in a grow room installation. The mounting options for the controller box are limited. You can't flush mount it and I wasn't able to find a mounting bracket that would allow it to be installed in a wall. Had to mount it on the wall. Looks ok but the cables can't really be hidden. 2. The power is plug in only, so if you want to hide the cord you'll have to install an outlet or have access to an existing outlet. I suppose you could cut off the plug and hardwire it, but the manufacturer suggests not to. This is an amazing fan and I'll be adding them to the other bathrooms in my house as well. Hoping AC Infinity comes up with a flush wall mount or a different controller design. Also a hardwire option would be fantastic. For a product this good they are so close to perfection.
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Reviewed in the United States on May 23, 2021 by B. Seehafer
Size: 4-Inch
Color: Pro Smart Controller for T4
I bought this inline duct fan to add ventilation to my home theater. I have other AC Infinity products which are good quality and value so i decided to give this product a try despite the fact that there are no reviews yet. i looked at a lot of other inline duct fans and this was appealing because it comes well-integrated with a controller (the same logic as their other products), probe, and a normal plug. Putting all this together from other vendors would have been more expensive and I wouldn't have ended up with a nice looking an user-friendly control. I installed a jump duct to create a path for fresh air from another room and then installed a boot/return and attached the fan. I have temporarily attached it to 8 feet of aluminum rigid expandable duct which isn't great for sound control. It is quiet, especially on the lowest setting; I cant hear it running on the lowest setting. At higher speeds I can hear the fan a bit so I have ordered 25' of acoustical flexible duct which I believe will result in the fan being whisper quiet on higher settings. I have mounted the control on the wall in my theater so that I can turn it on/off and change settings - this feature is key as the control is a nice unit. Another key differentiator from other fans is that there is a temperature probe that can be mounted and the control can manage the fan on/off/speed based on the probe temp which is excellent. Overall I am very happy that I chose to give this product a try - this product also came very well packaged with excellent installation instructions. I would buy again without hesitation.
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Reviewed in the United States on May 17, 2017 by OutdoorGuy