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
The Spider Farmer 4 in Inline Fan is the better inline duct fan overall, rated 3.4 to 2.8. The Spider Farmer 4 in Inline Fan leads on efficiency, value and airflow.
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 Spider Farmer 4 in Inline Fan for efficiency (7.6 CFM per watt (205 CFM, 27 W) vs 4.7 CFM per watt (165 CFM, 35 W)), value ($39.02 per 100 CFM ($79.99, 205 CFM) vs $48.48 per 100 CFM ($79.99, 165 CFM)) and airflow (205 CFM through 4 in duct vs 165 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 | Spider Farmer 4 in Inline Fan | AC Infinity CLOUDLINE A4 |
|---|---|---|
| Overall rating | 3.4/5 | 2.8/5 |
| Value 25% | 49 $39.02 per 100 CFM ($79.99, 205 CFM) | 24 $48.48 per 100 CFM ($79.99, 165 CFM) |
| Efficiency 25% | 51 7.6 CFM per watt (205 CFM, 27 W) | 19 4.7 CFM per watt (165 CFM, 35 W) |
| Airflow 15% | 71 205 CFM through 4 in duct | 38 165 CFM through 4 in duct |
| Noise 15% | 95 26.8 dBA at full speed | 89 29 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
| Spider Farmer 4 in Inline Fan | AC Infinity CLOUDLINE A4 | |
|---|---|---|
| Performance | ||
| Duct size | 4 in | 4 in |
| Rated airflow | 205 CFM | 165 CFM |
| Static pressure (not scored) | - | 324 Pa |
| Power at full speed | 27 W | 35 W |
| Power figure | Rated power | Max power draw |
| Average power (not scored) | - | 18 W |
| Airflow per watt | 7.6 CFM/W | 4.7 CFM/W |
| Price per 100 CFM | $39.02 | $48.48 |
| Noise at full speed | 26.8 dBA | 29 dBA |
| Top speed | 3,000 RPM | 2,800 RPM |
| Controls | ||
| Motor | EC | EC |
| Controller | Speed controller with RJ12 port | 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 | IP42 | IP44 |
| Voltage | 120 V | 100-240 V |
| Warranty | - | 2 years |