If you are weighing ac infinity cloudline fan vs inline duct fan for grow tent use for mushrooms, you are really comparing the AC Infinity CLOUDLINE S4 against the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM. Both are 4-inch inline fans made to move stale air out and pull fresh air in, which is central for steady fresh air exchange. They take very different approaches to power, noise and control.
As of November 2026, the choice comes down to how humid your setup runs and how much in-depth control you want. A small monotub closet needs gentle, intermittent exhaust, while a Martha tent with constant humidity needs reliable, repeatable ventilation. For background on balancing moisture and air movement, browse the Humidity, FAE & Climate Control archive before you decide.
This article contains affiliate links. If you buy through one of our links, FungiPop may earn a commission at no extra cost to you. Commissions never influence which products we recommend or how we rank them. Read our Affiliate Disclosure for details.
Quick Picks at a Glance
AC Infinity CLOUDLINE S4 4-Inch Inline Duct Fan
Prime VIVOSUN 4 Inch Inline Fan 130 CFM with Speed
As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated.
Pros
- Whisper quiet 28 dBA operation even at higher speeds
- Low 21 watt power draw with minimal heat buildup
- Accurate 10-speed control with smart UIS upgrade path
- Maintains airflow under static pressure from filters and ducting
- Lightweight and easy to install in tight spaces
Cons
- 205 CFM output is limited for large grow tents over 4x4 or whole room ventilation
- Included wired controller must be mounted within reach, smart features require separate UIS controller
- Designed for indoor use only and not suitable for outdoor or high moisture exhaust
The AC Infinity CLOUDLINE S4 is a compact 4-inch inline fan designed for grow tents, odor control, room to room airflow, and AV equipment cooling. It suits indoor growers, hobbyists, and homeowners who need reliable ventilation in small to medium spaces.
In real world use, it moves up to 205 CFM while staying remarkably quiet at 28 dBA on lower speeds. The included 10-speed wired controller makes it easy to dial in airflow, and UIS compatibility allows app control and automation with temperature and humidity triggers.
Build quality stands out with a matte polycarbonate housing, 10 plastic blades, and dual ball bearing EC motor rated for continuous duty. The mixed flow design with stator blades helps maintain pressure through ducting, bends, and carbon filters where axial fans stall.
It is not perfect for every job, as the 4-inch size limits power for larger tents or long multi room runs. The stock wired controller also feels basic compared to smart UIS controllers, which must be purchased separately for full automation.
Overall, the CLOUDLINE S4 is one of the best value quiet inline fans for 4-inch applications. If you want efficient, low noise ventilation with precise control and upgrade potential, it is an excellent pick.
Duct Size: 4 inch, Dimensions: 6.9 x 11.9 x 7.4 inches, Airflow: 205 CFM, Noise Level: 28 dBA, Speed: 2800 RPM.
Motor: PWM-controlled EC motor, 21 watts, dual ball bearings, 10 blades for mixed flow performance.
Control: Wired 10-speed controller included, compatible with all UIS controllers for app and smart programming.
Installation: Versatile horizontal or vertical mounting for indoor use, includes 144 inch power cord.
Pros
- Very quiet 26dB operation suitable for living spaces and work areas
- Strong 130 CFM airflow with low 7W power consumption
- Precise stepless speed control included for flexible tuning
- Lightweight build with multiple mounting options for easy install
- Durable materials with stall protection and low voltage safety
Cons
- 4-inch size and 130 CFM output best for small to medium rooms, not large spaces
- Basic dial control with no smart features, WiFi or auto humidity trigger
- Plastic housing feels less premium than metal duct fans
The VIVOSUN P4 is a compact 4-inch inline duct fan built to boost airflow and clear out heat, humidity, smoke and odors. It is made for grow tents, greenhouses, bathrooms, kitchens, basements, attics and workshops where steady exhaust matters.
In real world use, it moves up to 130 CFM at up to 4500 RPM while using only 7 watts thanks to its upgraded EC motor. The stepless dial controller lets you fine tune airflow precisely, so you can balance ventilation power with noise and energy use.
Despite its power, it runs as low as 26dB for quiet, distraction free operation in homes and offices. The brushless motor runs cooler and longer with less maintenance, which is ideal for continuous ventilation, 3D printer fumes and laser engraver exhaust.
Build quality centers on a sturdy ABS housing with PBT blades that resist warping and deformation. It supports wall, ceiling or inline duct mounting, includes low voltage safety and stall protection, and stays light for easy install.
It is not the right pick if you need whole house ventilation, as 4 inches and 130 CFM suit small to medium areas best. Overall, it is a reliable, energy efficient and quiet ventilation upgrade for growers and homeowners who want simple dial control.
Model VSV-IFP4C, 4-inch inline duct fan with EC brushless motor, 130 CFM max airflow, 4500 RPM max speed and 7W power draw.
Noise level 26dB, dial speed controller, multiple mounting options for wall, ceiling or inline duct, compact 6.38 x 3.86 x 3.86 inch plastic housing in black.
Recommended for air circulation, exhausting, fume and smoke removal in bathrooms, kitchens, grow tents, home offices and workshops, indoor use only.
How They Compare
Airflow Power and Exhaust Capacity
The AC Infinity CLOUDLINE S4 is rated at 205 CFM, while the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM is rated up to 130 CFM, so the AC Infinity option offers substantially more headroom on paper. For mushroom growers, that extra capacity matters when you add a carbon filter, a few duct bends, or a humid Martha tent that needs quick clearing after misting. Growers commonly report that higher rated fans can run at lower speeds for the same exchange, which helps with stability.
The AC Infinity CLOUDLINE S4 also uses a mixed flow design with stator blade and hydrodynamic wind circles to maintain airflow in high resistance areas, which is helpful when ducting is not perfectly straight. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM is described for grow tents, greenhouses, basements and workshops with secure mounting on walls, ceilings or inline duct systems, but it has less reserve for filters and long runs. If you plan on odor control or pushing through humid air and a filter, the lower airflow of the VIVOSUN unit is a real limitation.
Noise, Motor Design and Continuous Operation
The AC Infinity CLOUDLINE S4 lists 28 dBA and a PWM-controlled EC motor for quiet and energy-efficient performance with minimal heat and noise, plus dual ball bearings. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM lists 26dB(A) and an upgraded EC motor for low energy consumption, extended service life and reduced maintenance. On paper the VIVOSUN model is rated slightly more quiet, but actual sound depends on speed setting, duct vibration, mounting surface and whether you run wide open or turned down.
For around the clock use in a fruiting tent, bearing and housing design deserve attention when you compare the AC Infinity CLOUDLINE S4 and the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM. The AC Infinity unit names dual ball bearings, which growers often associate with smoother continuous running, while the VIVOSUN unit leans on sturdy ABS plastic housing with PBT blades, wide voltage range adapter, low-voltage safety and stall protection. A practical con is size and placement, since the AC Infinity housing measures 6.9 x 11.9 x 7.4 in. and can feel bulky in a tight closet, while the VIVOSUN unit may need higher relative speeds to match exchange, which can erase its paper noise advantage.
Speed Control and Automation for FAE
Control is where these two diverge most for mushroom routines. The AC Infinity CLOUDLINE S4 features a wired 10-speed fan controller and is also compatible with all UIS controllers with intelligent programming, so you can dial in a repeatable setting and expand to sensor based routines. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM uses an intuitive stepless speed regulator for precise manual adjustments to match your specific needs. If you like numbered repeatability and future automation, the AC Infinity approach is more structured, while the VIVOSUN dial feels direct and simple.
For daily mushroom care, that difference shows up when humidity spikes after heavy misting or when night temperatures shift and you want less exchange. The AC Infinity CLOUDLINE S4 paired with UIS control can adjust without you standing at the tent, which pairs well with guides like martha tent humidifier vs BoomRoom II. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM requires a manual turn of the dial, with no display or memory for exact settings. A clear con is that smart control adds complexity and a more premium path on the AC Infinity side, while the VIVOSUN dial can be bumped easily and offers no alerts if conditions drift.
Build Quality, Mounting and Ease of Setup
Both fans use a 4-inch duct size, so ducting and clamps are interchangeable in most small tent builds, and both are presented as inline solutions for grow tents. The AC Infinity CLOUDLINE S4 emphasizes ventilating grow tents, transferring heating and cooling, circulating air, exhausting odors and cooling AV racks, with ducting friendly mixed flow construction. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM emphasizes sturdy ABS plastic housing and PBT blades for durability and resistance to deformation, plus secure mounting on walls, ceilings or inline duct systems. For growers reviewing tent layouts in Monotubs, Martha Tents & Fruiting Chambers, either physical format will fit standard 4-inch ports.
In practice, setup ease favors simple placement, short duct runs and solid support to limit vibration when comparing the AC Infinity CLOUDLINE S4 with the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM. The AC Infinity unit feels more substantial and is built for longer duty with its EC motor and bearing package, but its larger body needs careful hanging in crowded closets. The VIVOSUN unit is easier to tuck into tight spots and wire quickly, but its lighter plastic housing can transmit more hum if hard mounted, and its lower 130 CFM ceiling means longer run times to clear very humid air. Neither fan includes odor filtration on its own, so plan for a separate filter if smell control matters.
Which One Should You Get
Choose AC Infinity CLOUDLINE S4 if you run a Martha tent or a small grow tent with a filter, high humidity and a need for steady, repeatable FAE. Its 205 CFM rating, mixed flow design for resistance areas, 10-speed wired controller and compatibility with UIS controllers make it better suited to humid exhaust, odor control and around the clock schedules. You should not buy it if you want the smallest footprint or a purely manual plug and play dial, since the housing at 6.9 x 11.9 x 7.4 in. takes space and smart features require extra components. With a strong 4.7 out of 5 from 4262 reviews, it is the higher-end pick for growers who value control and reserve power.
Choose VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM if you have a modest monotub closet or single small tent, want simple manual control and prefer a lower-cost entry point with quiet operation. Its stepless regulator, EC motor efficiency, 26dB(A) rating, ABS housing with PBT blades and stall protection cover basic exhaust and circulation without a learning curve. You should not buy it if you need to push through a dense filter plus long ducting or want automated humidity triggers, since 130 CFM leaves little margin and there is no sensor logic. It pairs well with low maintenance liners and tubs like those in monotub liner best budget picks for clean bulk grows where gentle exchange is enough.
Who Should Skip Both
Both of these 4-inch inline fans are not ideal for still air work, glove boxes, very large rooms or anyone who needs full climate regulation from one device. If you only do agar or grain in a still box, an exhaust fan can disrupt clean technique and add no benefit, and if you fruit in an open room you likely need a humidifier, dehumidifier or circulation fan rather than ducted exhaust. They are also not a good fit if you cannot vent outside or to a safe lung room, since recirculating humid, spore laden air back into the same closet invites condensation and contamination pressure.
Frequently Asked Questions
Is 130 CFM enough for a mushroom grow tent, or do I need 205 CFM?
For a small tent with short ducting and no filter, 130 CFM from the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM can provide adequate exchange when run steadily. If you add a carbon filter, longer ducting or run a very humid Martha style tent, the 205 CFM headroom of the AC Infinity CLOUDLINE S4 gives more margin and lets you run at lower speeds.
Can the AC Infinity CLOUDLINE S4 automate humidity and fresh air exchange?
Out of the box it includes a wired 10-speed controller for manual repeatable settings. For sensor based routines it is compatible with all UIS controllers with intelligent programming, which allows more hands-off adjustments than a basic dial when humidity rises.
Which is quieter for a bedroom grow, the AC Infinity CLOUDLINE S4 or the VIVOSUN P4?
The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM lists 26dB(A) and the AC Infinity CLOUDLINE S4 lists 28 dBA, so the VIVOSUN model is rated slightly lower on paper. In real rooms the quieter choice is usually the fan that can run at a lower speed for your tent, with soft mounting and smooth ducting doing as much work as the label rating.
Write Your Review
No reviews yet. Be the first to share your experience!