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
The VIVOSUN AeroZesh T4 is the better inline duct fan overall, rated 3.9 to 3.6. The VIVOSUN AeroZesh T4 leads on value and controls. The AC Infinity CLOUDLINE S4 wins on airflow. The VIVOSUN AeroZesh T4 costs $18 less ($71.99 vs $89.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
AC Infinity CLOUDLINE S4
#2 in 4 inFull review
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.
Amazon $89.99$89.99
Which should you buy?
- Choose the VIVOSUN AeroZesh T4 for value ($34.28 per 100 CFM ($71.99, 210 CFM) vs $39.82 per 100 CFM ($89.99, 226 CFM)) and controls (speed controller included, timer or cycle modes vs speed controller included).
- Choose the AC Infinity CLOUDLINE S4 for airflow (226 CFM through 4 in duct vs 210 CFM through 4 in duct).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 4 in inline duct fan; a clear win is highlighted. How we rank explains each one.
| Factor weight | VIVOSUN AeroZesh T4 | AC Infinity CLOUDLINE S4 |
|---|---|---|
| Overall rating | 3.9/5 | 3.6/5 |
| Value 25% | 64 $34.28 per 100 CFM ($71.99, 210 CFM) | 47 $39.82 per 100 CFM ($89.99, 226 CFM) |
| Efficiency 25% | 83 10.5 CFM per watt (210 CFM, 20 W), from a power figure labeled average | 56 8.1 CFM per watt (226 CFM, 28 W) |
| Airflow 15% | 75 210 CFM through 4 in duct | 88 226 CFM through 4 in duct |
| Noise 15% | 91 28 dBA at full speed | 97 26 dBA at full speed |
| Controls 10% | 55 speed controller included, timer or cycle modes | 40 speed controller included |
| Warranty 10% | 25 2-year warranty | 25 2-year warranty |
Specifications
| VIVOSUN AeroZesh T4 | AC Infinity CLOUDLINE S4 | |
|---|---|---|
| Performance | ||
| Duct size | 4 in | 4 in |
| Rated airflow | 210 CFM | 226 CFM |
| Static pressure (not scored) | - | 223 Pa |
| Power at full speed | 20 W | 28 W |
| Power figure | Labeled average | Max power draw |
| Average power (not scored) | - | 21 W |
| Airflow per watt | 10.5 CFM/W | 8.1 CFM/W |
| Price per 100 CFM | $34.28 | $39.82 |
| Noise at full speed | 28 dBA | 26 dBA |
| Top speed | 3,000 RPM | 2,800 RPM |
| Controls | ||
| Motor | EC | EC |
| Controller | 10-speed controller with cycle modes | 10-speed controller |
| Speeds | 10 | 10 |
| Temperature and humidity control | No | No |
| Phone app | No | No |
| Timer or cycle modes | Yes | No |
| Build | ||
| Housing | Plastic | Plastic |
| Ingress rating | IP44 | IP44 |
| Voltage | 110-240 V | 100-240 V |
| Warranty | 2 years | 2 years |