If you are comparing the AC Infinity CLOUDLINE S6 against the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM for mushroom fresh air exchange, you are choosing between high volume ventilation and compact simplicity. Both are inline duct fans made for grow tents, yet they fit very different indoor grows. One is built to pull hard through filters and long duct runs, while the other is made for small humid spaces.
Your real decision is tent volume, filter resistance, and how much automation you want around humidity. We assessed listed specifications and owner feedback with mushroom FAE and moisture retention in mind. If you run a Martha style chamber you need gentle and frequent exchanges without drying pins, while a larger fruiting tent needs stronger exhaust to clear carbon dioxide and odors.
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Quick Picks at a Glance
AC Infinity CLOUDLINE S6 6-Inch Inline Duct Fan
Prime VIVOSUN 4 Inch Inline Fan 130 CFM with Speed
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Pros
- Exceptionally quiet operation even at mid to high speeds
- Strong airflow at low speed settings with no need to run at full power
- Energy efficient EC motor runs cool with low power draw
- Easy installation with 8-foot cord and flexible duct compatibility
- UIS smart controller compatibility for automated temperature and humidity control
Cons
- Wired controller requires manual access unless you add a separate UIS controller
- 6-inch size may be oversized for very small tents or tight cabinets
- No included carbon filter or ducting, so extra accessories needed for complete odor control
The AC Infinity CLOUDLINE S6 is a 6 inch inline duct fan designed for grow tents, server closets, AV racks, workshops and home HVAC boosting. It suits growers, makers, streamers and homeowners who need steady ventilation without fan noise taking over the room.
With up to 402 CFM and a wired 10 speed controller, it lets you dial in gentle circulation or full exhaust in seconds. Users report strong cooling at only half speed for portable AC boosting, miner rooms, laser engravers and voiceover booths, all while staying remarkably quiet.
The PWM controlled EC motor runs cool and efficient at only 38 watts, while dual ball bearings support long continuous run times. Its mixed flow housing with stator blade pushes air effectively through longer duct runs and filters, and the matte finish looks clean in exposed installs.
It is not completely silent at top speed and the included controller is wired, so smart automation requires a separate UIS controller. You will also need to buy ducting, clamps or a carbon filter separately to complete an odor control setup.
For quiet power, efficiency and control flexibility, the CLOUDLINE S6 is one of the best 6 inch inline fans for indoor growing and equipment cooling. If you want reliable airflow that stays low key in living and work spaces, this is an easy recommendation.
Duct Size: 6 inch, Dimensions: 7.9 x 12.6 x 8.4 inches, Airflow: 402 CFM, Noise: 32 dBA, Power: 38 watts.
Motor: Brushless EC with PWM control, Bearings: Dual ball, Speeds: 10 levels via wired controller, UIS compatible for app and intelligent control.
Installation: Inline duct for indoor use, includes 8 foot power cord, ETL, CE and RoHS certified for safe continuous operation.
Best for 4x4 to 5x5 grow tents, small AV and server closets, recording booths, laser exhaust and portable AC boosting.
Run at speeds 3 to 5 for near silent background ventilation, reserve higher speeds for heat spikes or filter resistance.
Pair with a carbon filter for odor control and a UIS controller if you want automatic temperature and humidity triggers.
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 Output and Duct Size
The AC Infinity CLOUDLINE S6 is rated at 402 CFM with a 6-inch duct size, while the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM is rated up to 130 CFM with a 4-inch duct. That is more than a threefold difference in rated airflow, and it shapes everything from filter choice to cycle timing. The AC Infinity CLOUDLINE S6 also uses a mixed flow design with stator blade and hydrodynamic wind circles to maintain delivery in high resistance areas such as carbon filters and bent ducting.
For mushrooms, higher airflow helps clear carbon dioxide in a larger tent, but it can strip humidity if oversized for a small chamber. The AC Infinity CLOUDLINE S6 suits growers who need consistent negative pressure and odor exhaust through a filter, while the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM suits a small tent where short gentle exhaust pulses keep air fresh without drying the substrate. To place fan choice in a full climate plan, browse the Humidity, FAE and Climate Control archive for humidity and exchange balance.
Noise Levels and Speed Control
On listed noise, the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM is rated at just 26dB(A), while the AC Infinity CLOUDLINE S6 is rated at 32 dBA. Both use EC motors designed for quiet and energy efficient operation, but the ratings reflect different operating points because the AC Infinity CLOUDLINE S6 moves far more air at full speed. Control style also differs, with the AC Infinity CLOUDLINE S6 including a wired 10-speed fan controller and the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM using a stepless speed regulator for manual adjustment.
In a bedroom or closet grow, usable range matters more than a single low speed number. You can run the AC Infinity CLOUDLINE S6 at lower speeds for background FAE and raise it after misting or during heavy fruiting, which keeps noise modest while preserving flexibility. You can feather the VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM to a soft continuous trickle that holds humidity steady, a tactic often paired with the humidifier setups covered in the martha tent humidifier vs BoomRoom II.
Motor Design, Build and Controller Compatibility
Both fans use EC motors for low heat and reduced energy use, but the surrounding platforms are different. The AC Infinity CLOUDLINE S6 features a PWM-controlled EC motor with dual ball bearings and compatibility with all UIS controllers with intelligent programming, which allows temperature and humidity based automation. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM uses an upgraded EC motor in a sturdy ABS plastic housing with PBT blades for durability and resistance to deformation, plus a wide voltage range power adapter with low-voltage safety features and stall protection to prevent hazards.
The practical tradeoff is automation versus simplicity. The AC Infinity CLOUDLINE S6 is the better platform if you want sensor driven FAE cycles without manual dial turning, and its 4.8 out of 5 rating across 5552 reviews points to broad satisfaction with that approach. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM, rated 4.3 out of 5 across 6324 reviews, is simpler to wire and operate but offers no smart controller path and its plastic housing can feel less substantial. If you fruit mainly in tubs rather than tents, the monotub kit setup ideas for 54Qt explains when a tent fan is unnecessary.
Size, Mounting and Daily Use in a Mushroom Space
Footprint is a clear divider. The AC Infinity CLOUDLINE S6 measures 7.9 x 12.6 x 8.4 in. and requires 6-inch ducting, clamps, and a matching tent port, so you should plan for more space above or beside the tent. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM is designed for secure mounting on walls, ceilings, or inline duct systems and is listed as ideal for grow tents, greenhouses, basements, bathrooms, kitchens, attics, and workshops, which reflects a compact format that fits crowded Martha racks and closet shelves with 4-inch ducting.
Intended use also differs in the listings. The AC Infinity CLOUDLINE S6 is described as designed to ventilate grow tents, transfer heating and cooling to rooms, circulate air, exhaust odors, and cool AV racks, making it more capable for filtered odor exhaust and longer duct runs. The VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM is easier to install for short direct exhaust, such as out a nearby vent, but it will struggle to hold airflow through a dense filter and multiple bends. For help matching tent style to fan size, review the Monotubs, Martha Tents and Fruiting Chambers collection.
Which One Should You Get
Choose AC Infinity CLOUDLINE S6 if you run a larger fruiting tent, use a carbon filter for odor, or want automated climate control. Its 402 CFM output, 6-inch duct, mixed flow housing, and UIS controller compatibility give you headroom for resistance and growth in colony size. The downside is real: it needs larger ducting and port space, it can dry a tiny humid chamber if run too high, and it is the higher-end pick for growers who do not need that much power.
Choose VIVOSUN P4 4″ Inline Fan &Speed Control 130 CFM if you run a small Martha tent, closet chamber, or single tent with short ducting and no heavy filter load. Its 130 CFM output, 4-inch format, 26dB(A) rating, and stepless regulator make it simple to hold gentle FAE without stripping humidity. The tradeoff is limited power for larger tents, no smart controller ecosystem, and a lower overall rating profile, so you should not buy it expecting to push air through long runs or dense filtration.
Who Should Skip Both
If you fruit only in sealed monotubs with manual fanning or in small still air style containers, powered tent exhaust is not ideal for your setup and adds drying without benefit. These inline fans are also not a good fit for a glove box or clean inoculation area where filtered positive pressure, not tent exhaust, matters. Skip both and focus on passive FAE holes, liners, and humidity control until you move to a tent that truly needs ducted exchange.
Frequently Asked Questions
Is the AC Infinity CLOUDLINE S6 too powerful for a small mushroom tent?
It can be if you run it at full speed in a tiny humid chamber, since 402 CFM will replace air very quickly and pull out moisture. Use the wired 10-speed controller or a UIS controller to run low background speeds with brief boosts. If you prefer a set and forget small fan, the 130 CFM VIVOSUN is easier to balance.
Can the VIVOSUN P4 4 inch fan handle a carbon filter for grow tent odor?
It can handle light duty venting, but 130 CFM through a 4-inch duct loses pull quickly with dense filtration and bends. For odor control with a proper carbon filter and longer ducting, the AC Infinity CLOUDLINE S6 with its mixed flow design and 6-inch duct is the safer choice. Keep duct runs short and clean if you stay with the smaller fan.
Which is more quiet for a bedroom grow, AC Infinity S6 or VIVOSUN P4?
The VIVOSUN P4 lists 26dB(A) versus 32 dBA for the AC Infinity CLOUDLINE S6, so it has the lower rated figure at low speed. In daily use, the AC Infinity unit can still run quietly when dialed down because you rarely need full output for mushrooms. Choose based on tent size first, then use speed control to keep night operation discreet.
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