AC Infinity CLOUDLINE S4
#2 in 4 inFull review
A quiet, efficient 4 in fan for small grow tents, closets and AV cabinets. The S line adds a longer cord and more airflow than the cheaper A4.
Amazon $89.99$89.99
4 in226 CFM8.1 CFM/W26 dBA
8 AC Infinity duct fans ranked. Each one is scored and ranked against every brand in its duct size, so "#3 mid-size" means third of all mid-size duct fans here, not third among AC Infinity's own.
AC Infinity makes 8 current duct fans: 3 4 in, 2 6 in and 3 8 in and up. Prices run from $79.99 for the AC Infinity CLOUDLINE A4 to $379 for the AC Infinity CLOUDLINE S12. Its best-rated model in each size: the AC Infinity CLOUDLINE S4 (#2 of 7 4 in, rated 3.6), the AC Infinity CLOUDLINE S6 (#2 of 9 6 in, rated 3.4) and the AC Infinity CLOUDLINE A8 (#7 of 9 8 in and up, rated 2.7).
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 duct fans 8
- AC Infinity CLOUDLINE S4#2 4 inFull review
A quiet, efficient 4 in fan for small grow tents, closets and AV cabinets. The S line adds a longer cord and more airflow than the cheaper A4.
Amazon $89.99$89.994 in226 CFM8.1 CFM/W26 dBA - AC Infinity CLOUDLINE T4#3 4 inFull review
The S4 fan paired with a temperature and humidity controller and WiFi app. For a small grow tent that should run itself.
Amazon $119$1194 in226 CFM8.1 CFM/W26 dBA - AC Infinity CLOUDLINE S6#2 6 inFull review
The usual pick for a 4x4 or 5x5 grow tent with a carbon filter: plenty of airflow, high static pressure and quiet running.
Amazon $99$996 in425 CFM6.1 CFM/W30 dBA - AC Infinity CLOUDLINE A6#8 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$89.996 in352 CFM5.4 CFM/W34 dBA - AC Infinity CLOUDLINE A4#6 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$79.994 in165 CFM4.7 CFM/W29 dBA - AC Infinity CLOUDLINE A8#7 8 in and upFull review
An 8 in EC fan for large tents and small grow rooms, with high static pressure. It draws more power at full speed than rivals that move more air.
Amazon $139$1398 in724 CFM3.8 CFM/W42 dBA - AC Infinity CLOUDLINE S10#8 8 in and upFull review
A 10 in EC fan for grow rooms and big carbon filters, with the highest static pressure in the range. Loud near full speed.
Amazon $279$27910 in1,201 CFM4.7 CFM/W48 dBA - AC Infinity CLOUDLINE S12#9 8 in and upFull review
The largest CLOUDLINE, moving 1,604 CFM for big rooms and multiple tents. It is loud at full speed, so most owners run it lower.
Amazon $379$37912 in1,604 CFM6.4 CFM/W62 dBA
