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 2.8. The VIVOSUN AeroZesh T4 leads on value, airflow and controls. The VIVOSUN AeroZesh T4 costs $8 less ($71.99 vs $79.99).
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 A4
#6 in 4 inFull review
The budget member of the CLOUDLINE 4 in range, with the same controller and build but less airflow than the S4. Worth it for its higher static pressure behind a small carbon filter.
Amazon $79.99$79.99
Which should you buy?
- Choose the VIVOSUN AeroZesh T4 for value ($34.28 per 100 CFM ($71.99, 210 CFM) vs $48.48 per 100 CFM ($79.99, 165 CFM)), airflow (210 CFM through 4 in duct vs 165 CFM through 4 in duct) and controls (speed controller included, timer or cycle modes vs speed controller included).
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 A4 |
|---|---|---|
| Overall rating | 3.9/5 | 2.8/5 |
| Value 25% | 64 $34.28 per 100 CFM ($71.99, 210 CFM) | 24 $48.48 per 100 CFM ($79.99, 165 CFM) |
| Efficiency 25% | 83 10.5 CFM per watt (210 CFM, 20 W), from a power figure labeled average | 19 4.7 CFM per watt (165 CFM, 35 W) |
| Airflow 15% | 75 210 CFM through 4 in duct | 38 165 CFM through 4 in duct |
| Noise 15% | 91 28 dBA at full speed | 89 29 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 A4 | |
|---|---|---|
| Performance | ||
| Duct size | 4 in | 4 in |
| Rated airflow | 210 CFM | 165 CFM |
| Static pressure (not scored) | - | 324 Pa |
| Power at full speed | 20 W | 35 W |
| Power figure | Labeled average | Max power draw |
| Average power (not scored) | - | 18 W |
| Airflow per watt | 10.5 CFM/W | 4.7 CFM/W |
| Price per 100 CFM | $34.28 | $48.48 |
| Noise at full speed | 28 dBA | 29 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 |