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 3.1. The VIVOSUN R6 6 in Inline Fan leads on value. The VIVOSUN R6 6 in Inline Fan costs $52 less ($63.99 vs $115.99).
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.
Spider Farmer 6 in Inline Fan
#7 in 6 inFull review
A quiet 6 in EC fan for 4x4 tents, best for owners already using Spider Farmer’s GGS controller.
Amazon $115.99$115.99
Which should you buy?
- Choose the VIVOSUN R6 6 in Inline Fan for value ($16.41 per 100 CFM ($63.99, 390 CFM) vs $28.85 per 100 CFM ($115.99, 402 CFM)).
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 | Spider Farmer 6 in Inline Fan |
|---|---|---|
| Overall rating | 3.2/5 | 3.1/5 |
| Value 25% | 91 $16.41 per 100 CFM ($63.99, 390 CFM) | 33 $28.85 per 100 CFM ($115.99, 402 CFM) |
| Efficiency 25% | 0 power draw not published, scored as the lowest | 39 6.5 CFM per watt (402 CFM, 62 W) |
| Airflow 15% | 70 390 CFM through 6 in duct | 76 402 CFM through 6 in duct |
| Noise 15% | 74 34 dBA at full speed | 80 32 dBA at full speed |
| Controls 10% | 40 speed controller included | 40 speed controller included |
| Warranty 10% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| VIVOSUN R6 6 in Inline Fan | Spider Farmer 6 in Inline Fan | |
|---|---|---|
| Performance | ||
| Duct size | 6 in | 6 in |
| Rated airflow | 390 CFM | 402 CFM |
| Power at full speed | - | 62 W |
| Power figure | - | Rated power |
| Airflow per watt | - | 6.5 CFM/W |
| Price per 100 CFM | $16.41 | $28.85 |
| Noise at full speed | 34 dBA | 32 dBA |
| Top speed | 2,450 RPM | - |
| Controls | ||
| Motor | - | EC |
| Controller | Stepless speed controller | Speed controller with RJ12 port |
| Speeds | Stepless | Stepless |
| Temperature and humidity control | No | No |
| Phone app | No | No |
| Timer or cycle modes | No | No |
| Build | ||
| Housing | Plastic | Plastic |
| Ingress rating | - | IP42 |