VIVOSUN AeroZesh T4
#1 in 4 inFull review
A very efficient 4 in EC fan with a 10-speed controller and on/off cycle modes, at a lower price than the CLOUDLINE S4.
Amazon $71.99$71.99
4 in210 CFM10.5 CFM/W28 dBA
3.6/5
A quiet, efficient 4 in fan for small grow tents, closets and AV cabinets. The S line adds a longer cord and more airflow than the cheaper A4.
- 226 CFMAirflow
- 28 WPower
- 26 dBANoise
- ECMotor
Check price at Amazon$89.99
Price checked November 8, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Ten-speed controller included, and it plugs into AC Infinity’s smart controllers later
- Among the quietest fans of its size at full speed (26 dBA rated)
Cons
- Costs more than budget EC fans that move similar air
The AC Infinity CLOUDLINE S family
Every AC Infinity CLOUDLINE S model we rank, smallest first. Ratings compare each against its own duct size.
| Model | Airflow | Rating | Price |
|---|---|---|---|
| AC Infinity CLOUDLINE S4 (this one) | 226 CFM | 3.6/5 | $89.99 |
| AC Infinity CLOUDLINE S6 | 425 CFM | 3.4/5 | $99 |
| AC Infinity CLOUDLINE S10 | 1,201 CFM | 2.7/5 | $279 |
| AC Infinity CLOUDLINE S12 | 1,604 CFM | 2.6/5 | $379 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its duct size. How we rank explains each one.
Specifications
| Model number | AI-CLS4 |
|---|---|
| Performance | |
| Duct size | 4 in |
| Rated airflow | 226 CFM |
| Static pressure (not scored) | 223 Pa |
| Power at full speed | 28 W |
| Power figure | Max power draw |
| Average power (not scored) | 21 W |
| Airflow per watt | 8.1 CFM/W |
| Price per 100 CFM | $39.82 |
| Noise at full speed | 26 dBA |
| Top speed | 2,800 RPM |
| Controls | |
| Motor | EC |
| Controller | 10-speed controller |
| Speeds | 10 |
| Temperature and humidity control | No |
| Phone app | No |
| Timer or cycle modes | No |
| Build | |
| Housing | Plastic |
| Ingress rating | IP44 |
| Voltage | 100-240 V |
| Warranty | 2 years |
Alternatives in this duct size
AC Infinity CLOUDLINE T4
#3 in 4 inFull review
The S4 fan paired with a temperature and humidity controller and WiFi app. For a small grow tent that should run itself.
Amazon $119$119
4 in226 CFM8.1 CFM/W26 dBA
Spider Farmer 4 in Inline Fan
#4 in 4 inFull review
A quiet, efficient 4 in EC fan for small grow tents, priced below the CLOUDLINE S4.
Amazon $79.99$79.99
4 in205 CFM7.6 CFM/W26.8 dBA
Compare
Compare the AC Infinity CLOUDLINE S4 with any other inline duct fan →
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