Hon&Guan PRO 4 in Inline Fan
#5 in 4 inFull review
A low-cost 4 in EC fan with strong rated airflow. Its power draw is not published, which keeps it below documented rivals.
Amazon $63.99$63.99
The Hon&Guan PRO 4 in Inline Fan is the better inline duct fan overall, rated 3.2 to 2.8. The Hon&Guan PRO 4 in Inline Fan leads on value and airflow. The Hon&Guan PRO 4 in Inline Fan costs $16 less ($63.99 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 Hon&Guan PRO 4 in Inline Fan for value ($30.18 per 100 CFM ($63.99, 212 CFM) vs $48.48 per 100 CFM ($79.99, 165 CFM)) and airflow (212 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 | Hon&Guan PRO 4 in Inline Fan | AC Infinity CLOUDLINE A4 |
|---|---|---|
| Overall rating | 3.2/5 | 2.8/5 |
| Value 25% | 78 $30.18 per 100 CFM ($63.99, 212 CFM) | 24 $48.48 per 100 CFM ($79.99, 165 CFM) |
| Efficiency 25% | 0 power draw not published, scored as the lowest | 19 4.7 CFM per watt (165 CFM, 35 W) |
| Airflow 15% | 77 212 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% | 40 speed controller included | 40 speed controller included |
| Warranty 10% | 0 warranty not published, scored as none | 25 2-year warranty |
Specifications
| Hon&Guan PRO 4 in Inline Fan | AC Infinity CLOUDLINE A4 | |
|---|---|---|
| Performance | ||
| Duct size | 4 in | 4 in |
| Rated airflow | 212 CFM | 165 CFM |
| Static pressure (not scored) | - | 324 Pa |
| Power at full speed | - | 35 W |
| Power figure | - | Max power draw |
| Average power (not scored) | - | 18 W |
| Airflow per watt | - | 4.7 CFM/W |
| Price per 100 CFM | $30.18 | $48.48 |
| Noise at full speed | 28 dBA | 29 dBA |
| Top speed | - | 2,800 RPM |
| Controls | ||
| Motor | EC | 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 | Metal | Plastic |
| Ingress rating | IP42 | IP44 |
| Voltage | - | 100-240 V |
| Warranty | - | 2 years |