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Search “AC Infinity vs VIVOSUN inline fan” and every result on the first page is cannabis-focused. Every single one. The comparison reviews reference “flower smell control,” “grow room odor,” and “carbon filter performance during late bloom.” None of them mention lettuce, tomatoes, peppers, or any food crop. None of them address the fact that most food growers don’t need a carbon filter at all — which changes the buying calculus significantly.

This is the first food-framed comparison between AC Infinity and VIVOSUN inline fan kits. We’re comparing the two most popular 4-inch kits in the consumer grow tent category, with honest framing for indoor vegetable growers who care about noise, electricity costs, and temperature management — not odor scrubbing for cannabis.

If you haven’t read our grow tent ventilation guide yet, start there. It explains why ~70% of food growers don’t need a carbon filter and can save $50-130 by buying a standalone fan instead of a full filter kit. This article is the head-to-head comparison for the two dominant brands in the inline fan category.

The Quick Answer

Feature	AC Infinity CLOUDLINE LITE 4”	VIVOSUN R4 4”
Kit price	~$130	~$96
CFM	165	190
Noise	29 dBA	~35 dBA
Power draw	28W	59W
Carbon filter	Australian RC412 activated carbon	RC48 Australian charcoal
Speed control	10-speed dial + UIS smart control compatible	Basic speed dial
Duct size	4 inch	4 inch

One-line recommendation: AC Infinity CLOUDLINE LITE if your tent is in a living space where noise matters. VIVOSUN R4 if the tent is in a garage or basement and you want to save $35. Both are adequate for food-crop ventilation; the difference is refinement, not capability.

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Why Ventilation Matters for Food Crops (It’s Not About Smell)

In cannabis growing, the inline fan’s primary job is odor control — pulling air through a carbon filter to scrub the smell before exhausting it. The fan’s secondary job is temperature and humidity management.

For food crops, those priorities flip. The inline fan’s primary job is temperature and humidity management. Your LED grow light generates heat. Your plants transpire moisture. Without active air exchange, the tent overheats and humidity climbs into fungal-risk territory (above 80% RH). The fan pulls fresh air in through passive intake vents and exhausts warm, humid air out through the top duct port.

Odor control is a non-issue for the vast majority of food crops. Lettuce, herbs, kale, spinach, and microgreens produce zero meaningful odor. Tomato vines have a faint green-vegetal smell that most people find pleasant. Basil in bloom smells like basil. See our full ventilation guide for the breakdown of the 70% who don’t need a carbon filter vs the 30% who might.

This means the buying criteria for food growers are different from cannabis growers:

Noise — the tent might be in a bedroom, office, or living room. Noise matters more when odor doesn’t.
Power efficiency — the fan runs 16-24 hours a day. Watts add up.
Airflow adequacy — you need enough CFM to exchange tent air volume every 1-3 minutes.
Smart control — temperature-triggered speed adjustment is genuinely useful for food crops where maintaining a 65-80°F range matters.
Carbon filter quality — distant fifth, relevant only for the 30% edge case.

AC Infinity CLOUDLINE LITE 4”: The Quiet Pick

The AC Infinity CLOUDLINE LITE is the 4-inch entry point in AC Infinity’s inline fan lineup. It sits below the CLOUDLINE T4 (which adds built-in temperature/humidity controller) and the CLOUDLINE S4 (which adds a 10-speed digital display). The LITE uses the same mixed-flow fan motor as the higher-tier models but pairs it with a simpler 10-speed manual dial instead of the digital controller.

What AC Infinity gets right:

29 dBA at max speed — this is genuinely quiet. For reference, a typical refrigerator hum is 35-40 dBA. At 29 dBA, the CLOUDLINE LITE is essentially inaudible from the next room and barely audible in the same room. This is the single biggest advantage for food growers with tents in living spaces.
28W power draw — less than half of the VIVOSUN’s 59W. Over a year of 24/7 operation, that’s ~271 kWh saved, which works out to roughly $43/year in electricity savings at the US average rate. The AC Infinity partially pays back its higher purchase price through lower operating costs.
UIS smart control compatibility — AC Infinity’s UIS (Universal Integrated System) lets you connect the CLOUDLINE LITE to an AC Infinity controller (sold separately, ~$30-50) for automatic temperature- and humidity-triggered speed adjustment. This is genuinely useful for food crops: set the controller to ramp the fan up when tent temperature exceeds 80°F and back down when it drops below 75°F. The VIVOSUN has no equivalent smart ecosystem.
Mixed-flow fan design — quieter and more efficient than traditional axial fans because the motor and blade design are optimized for duct static pressure rather than open-air volume.
RC412 Australian activated carbon filter — high-quality carbon with rated 12-month life. Relevant for the 30% of food growers who do want odor/dust filtration; overkill for the 70% who don’t.

What AC Infinity gets wrong:

Price — $130 for a 4-inch fan kit is a premium. The VIVOSUN does the same basic job (move air through a tent) for $35 less.
165 CFM — lower rated airflow than the VIVOSUN’s 190 CFM. In practice, both exceed the minimum airflow requirement for a 2x4 or 3x3 tent (50-80 CFM), so the difference is academic for most food-crop setups. But if you’re running a larger tent or a particularly heat-generating setup, the VIVOSUN’s higher CFM provides more headroom.
Smart control sold separately — the UIS integration is a key selling point, but the controller itself costs an additional $30-50. The “all-in” AC Infinity smart ventilation system is $160-180, not $130.

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VIVOSUN R4 4”: The Budget Pick

The VIVOSUN R4 is VIVOSUN’s current-generation 4-inch inline fan kit, replacing the older AeroZesh series. It includes a fan, carbon filter, ducting, and clamps in a single box at a lower price point than AC Infinity.

What VIVOSUN gets right:

Price — ~$96 for the complete kit. That’s $35 less than the AC Infinity CLOUDLINE LITE, and it includes everything you need for a basic ventilation setup.
190 CFM — higher rated airflow than the AC Infinity’s 165 CFM. More airflow headroom for larger tents or warmer environments.
Complete kit — fan, carbon filter, 8 feet of ducting, clamps, all in one box. No separate purchases needed for basic operation.
RC48 Australian charcoal filter — adequate carbon filtration for the minority of food growers who need it. Rated for 12-18 months.

What VIVOSUN gets wrong:

Noise — ~35 dBA at max speed. Measurably louder than the AC Infinity’s 29 dBA. The 6 dBA difference sounds modest on paper but represents roughly a 4x perceived loudness increase (decibels are logarithmic). At 35 dBA you’ll hear the fan from the next room. Not obnoxiously loud, but noticeable — especially at night if the tent is near a bedroom.
59W power draw — more than double the AC Infinity’s 28W. Over a year of 24/7 operation, that’s ~517 kWh vs the AC Infinity’s ~245 kWh. At $0.16/kWh, the VIVOSUN costs roughly $43/year more in electricity than the AC Infinity. Over two years, the AC Infinity’s higher purchase price is fully recovered through electricity savings.
Basic speed dial — no smart integration, no temperature-triggered speed adjustment, no app control. You set the speed manually and it stays there until you change it. Fine for simple setups; limiting if you want automated climate management.
Build quality — the R4 is adequate but noticeably less refined than the AC Infinity. The speed dial feels cheaper, the housing is thinner gauge, and the overall fit-and-finish is consistent with the lower price point.

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The Carbon Filter Question for Food Growers

Both kits include a carbon filter. Before you install it, ask yourself: do I actually need it?

As we cover in detail in our grow tent ventilation guide, approximately 70% of indoor food growers don’t need a carbon filter. The carbon filter’s job is odor scrubbing — pulling air through activated carbon to remove volatile organic compounds before the air exits the tent. Cannabis produces strong odors that necessitate this. Most food crops don’t.

Skip the carbon filter if:

You’re growing lettuce, herbs, leafy greens, kale, spinach, or microgreens (zero meaningful odor)
Your tent is in a room with a door (even tomato vine smell doesn’t permeate through a closed door)
You live in a house rather than a tight apartment

Install the carbon filter if:

Your tent is in an open-plan living space AND you’re growing tomatoes/peppers AND someone in the household dislikes the faint vegetal smell
You want dust/pollen filtration (relevant for allergy sufferers)
You’re running the tent in a shared space where any plant odor is unwelcome

The practical impact of removing the carbon filter: lower noise (the filter creates static pressure that forces the fan to work harder), lower electricity consumption (fan runs at lower speed for the same airflow), and one fewer consumable to replace every 12-18 months ($25-50 per replacement filter).

2-Year Total Cost of Ownership

Cost component	AC Infinity CLOUDLINE LITE	VIVOSUN R4
Kit purchase	$130	$96
Annual electricity (24/7 at avg speed)	~$35	~$75
Carbon filter replacement (Year 2)	$35 (if using filter)	$28 (if using filter)
2-year total (with filter)	~$235	~$274
2-year total (no filter, fan only)	~$200	~$246

The AC Infinity costs more upfront but is cheaper to own over 2 years due to its lower power consumption. The crossover point where the electricity savings recover the higher purchase price is approximately 10 months of 24/7 operation.

Smart Control: Does It Matter for Food Crops?

Yes — more than it matters for cannabis growing, ironically.

Food crops have specific temperature ranges for optimal growth (65-80°F for most crops, 70-85°F for tomatoes and peppers). A temperature-triggered fan speed controller automatically ramps the fan up when the tent gets too warm and reduces speed when it cools down. This maintains a more stable growing environment with less manual intervention.

AC Infinity’s UIS system lets you add a controller ($30-50 separate purchase) that monitors temperature and humidity inside the tent and adjusts fan speed automatically. The controller connects to the CLOUDLINE LITE via AC Infinity’s UIS cable and can also integrate with other AC Infinity products (humidifiers, circulation fans, grow lights) for a unified smart-tent system.

VIVOSUN’s approach: the R4 has a basic speed dial. No smart features, no temperature sensing, no automation. You set it and forget it. For many food growers this is perfectly fine — set the dial to medium-low and the tent stays within acceptable range in most home environments.

The honest assessment: the UIS smart control is a genuine quality-of-life improvement for food growers who want hands-off climate management, but it’s not essential. A $35 Inkbird ITC-308 temperature controller plugged into any fan (including the VIVOSUN) provides the same automatic temperature-triggered on/off control for less than the cost of AC Infinity’s UIS controller. The UIS system is more elegant but not the only path to automated climate control.

Decision Framework

Buy the AC Infinity CLOUDLINE LITE (~$130) if:

Your tent is in a living space — bedroom, office, living room, anywhere noise matters
You want the lowest possible electricity costs over the long term
You’re interested in the UIS smart ecosystem for automated climate control
You plan to keep the setup running for 12+ months (the electricity savings compound)
Quiet operation at night is a priority

Buy the VIVOSUN R4 (~$96) if:

Your tent is in a garage, basement, spare room, or other space where noise is irrelevant
Budget is the primary constraint and you want the cheapest functional ventilation kit
You don’t need smart control and are happy with a manual speed dial
You’re testing whether indoor food growing is for you and don’t want to over-invest upfront

Consider skipping the full kit entirely if:

You’re in the 70% of food growers who don’t need a carbon filter
A standalone 4-inch inline fan at $30-50 (no filter) provides the air exchange you need at lower cost and lower noise
See our ventilation guide for standalone fan recommendations

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Frequently Asked Questions

Do I need a 4-inch or 6-inch fan for a food-crop tent?

For a 2x2 or 2x4 tent, a 4-inch fan is sufficient. Both the AC Infinity CLOUDLINE LITE 4” (165 CFM) and VIVOSUN R4 4” (190 CFM) can exchange the air volume of a 2x4 tent (32 cubic feet) 5-6 times per minute at full speed — far more than the 1-3 air exchanges per minute that food crops need. Step up to a 6-inch fan only if you’re running a 4x4 or larger tent, or if your growing environment is exceptionally warm (above 90°F ambient) and you need maximum airflow.

Can I use the AC Infinity fan without the carbon filter?

Yes — and for most food growers, you should. Simply don’t connect the carbon filter and run the fan as a standalone exhaust unit. This reduces noise (less static pressure), reduces power consumption, and eliminates the recurring cost of filter replacement. Mount the fan at the top of the tent, connect it to the exhaust duct port, and let it pull warm air out of the tent.

How loud is 29 dBA vs 35 dBA in real terms?

29 dBA is roughly equivalent to a quiet whisper or a rural nighttime environment. 35 dBA is roughly equivalent to a quiet home or library. The 6 dBA difference represents approximately a 4x increase in perceived loudness because decibels are logarithmic. In practical terms: the AC Infinity is nearly inaudible from the next room, while the VIVOSUN is audible through an open door but not through a closed one.

Is AC Infinity’s UIS controller worth the extra $30-50?

For food growers who want automated temperature management, yes — it’s genuinely useful. But it’s not the only option. An Inkbird ITC-308 at $35 provides basic temperature-triggered on/off control for any fan, including the VIVOSUN. The UIS system offers finer-grained 10-speed modulation and integration with other AC Infinity products, which is nicer but not strictly necessary.

Will either fan be loud enough to disturb sleep?

The AC Infinity CLOUDLINE LITE at 29 dBA is quiet enough for most people to sleep through, even in the same room. The VIVOSUN R4 at 35 dBA is borderline — it depends on your sensitivity to background noise. If the tent is in a bedroom, the AC Infinity is the clear choice. If it’s in another room with the door closed, either fan is fine.

Bottom Line

The AC Infinity CLOUDLINE LITE is the better fan for food growers with tents in living spaces — quieter, more efficient, and compatible with smart climate control. The VIVOSUN R4 is the budget-appropriate pick for garage and basement setups where noise doesn’t matter. Both work. Neither is a bad choice for the basic job of moving air through a tent.

The bigger decision for food growers isn’t which brand to buy — it’s whether you need the carbon filter at all. Most of you don’t. Read our ventilation guide before you default to a full filter kit you may never need.

Methodology note. This comparison is based on published manufacturer specifications, aggregated owner reviews from Amazon and Reddit, and real-world noise and power measurements reported by independent reviewers. Noise levels are manufacturer-reported figures validated against community measurements. Electricity cost calculations assume 24/7 operation at average speed (approximately 60% of rated wattage) and the US national average residential electricity rate of $0.16/kWh. Read our full testing methodology.

Last verified pricing: 2026-04-09. Report a stale price.

Affiliate disclosure (full). This article contains affiliate links. We earn a small commission when you buy through these links — at no extra cost to you. We don’t accept paid placements, sponsored reviews, or product gifts in exchange for coverage. Read our full affiliate policy.

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