VIVOSUN R6 6 in Inline Fan
#3 in 6 inFull review
A low-cost 6 in fan for bathroom, basement or tent exhaust when running cost and filter performance matter less than price.
Amazon $63.99$63.99
The VIVOSUN R6 6 in Inline Fan is the better inline duct fan overall, rated 3.2 to 3.0. The VIVOSUN R6 6 in Inline Fan leads on value and airflow. The VIVOSUN R6 6 in Inline Fan costs $26 less ($63.99 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 A6
#8 in 6 inFull review
A cheaper 6 in CLOUDLINE with less airflow and a little more noise than the S6. A fine fit for a tent that does not need the full 425 CFM.
Amazon $89.99$89.99
Which should you buy?
- Choose the VIVOSUN R6 6 in Inline Fan for value ($16.41 per 100 CFM ($63.99, 390 CFM) vs $25.57 per 100 CFM ($89.99, 352 CFM)) and airflow (390 CFM through 6 in duct vs 352 CFM through 6 in duct).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 6 in inline duct fan; a clear win is highlighted. How we rank explains each one.
| Factor weight | VIVOSUN R6 6 in Inline Fan | AC Infinity CLOUDLINE A6 |
|---|---|---|
| Overall rating | 3.2/5 | 3.0/5 |
| Value 25% | 91 $16.41 per 100 CFM ($63.99, 390 CFM) | 46 $25.57 per 100 CFM ($89.99, 352 CFM) |
| Efficiency 25% | 0 power draw not published, scored as the lowest | 27 5.4 CFM per watt (352 CFM, 65 W) |
| Airflow 15% | 70 390 CFM through 6 in duct | 51 352 CFM through 6 in duct |
| Noise 15% | 74 34 dBA at full speed | 74 34 dBA at full speed |
| Controls 10% | 40 speed controller included | 40 speed controller included |
| Warranty 10% | 0 warranty not published, scored as none | 25 2-year warranty |
Specifications
| VIVOSUN R6 6 in Inline Fan | AC Infinity CLOUDLINE A6 | |
|---|---|---|
| Performance | ||
| Duct size | 6 in | 6 in |
| Rated airflow | 390 CFM | 352 CFM |
| Static pressure (not scored) | - | 394 Pa |
| Power at full speed | - | 65 W |
| Power figure | - | Max power draw |
| Average power (not scored) | - | 35 W |
| Airflow per watt | - | 5.4 CFM/W |
| Price per 100 CFM | $16.41 | $25.57 |
| Noise at full speed | 34 dBA | 34 dBA |
| Top speed | 2,450 RPM | - |
| Controls | ||
| Motor | - | EC |
| Controller | Stepless speed controller | 10-speed controller |
| Speeds | Stepless | 10 |
| Temperature and humidity control | No | No |
| Phone app | No | No |
| Timer or cycle modes | No | No |
| Build | ||
| Housing | Plastic | Plastic |
| Ingress rating | - | IP44 |
| Voltage | - | 100-240 V |
| Warranty | - | 2 years |