A Black Friday "deal" is often a normal price next to an inflated list price. Here a inline duct fan only counts as on sale when its checked price is at least 15% below its own typical price over the last 90 days, from our price history. The best-rated models are listed too, since many are good value without a sale. See deals in every category.
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.
On sale now
No inline duct fan rated 3.8 or higher is 15% or more below its typical price at the last price check (November 9, 2026). Prices are rechecked through the sales; this list updates when one drops. See the recent price changes.
Best buys at their normal price
The top-rated models in each duct size. A sale on one of these is worth more than a big discount on a weaker model.
Best 4 Inch Inline Duct Fans
- VIVOSUN AeroZesh T4#1 of 7Full review
A very efficient 4 in EC fan with a 10-speed controller and on/off cycle modes, at a lower price than the CLOUDLINE S4.
Amazon $71.99$71.994 in210 CFM10.5 CFM/W28 dBA - AC Infinity CLOUDLINE S4#2 of 7Full 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 of 7Full 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
Best 6 Inch Inline Duct Fans
- VIVOSUN AeroZesh T6#1 of 9Full review
A 6 in EC fan that moves about as much air as the CLOUDLINE S6 on half the rated power, for less money. The rated noise is higher.
Amazon $89.99$89.996 in408 CFM11.7 CFM/W32 dBA - AC Infinity CLOUDLINE S6#2 of 9Full 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 - VIVOSUN R6 6 in Inline Fan#3 of 9Full 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$63.996 in390 CFM-34 dBA
Best 8 to 12 Inch Inline Duct Fans
- VIVOSUN AeroZesh T8#1 of 9Full review
A strong 8 in EC fan for large tents at a mid-range price, with excellent rated airflow per watt.
Amazon $119.99$119.998 in832 CFM11.1 CFM/W45 dBA - VEVOR 8 in EC Inline Fan HF-200PE#2 of 9Full review
A cheap 8 in EC fan with a full-featured controller. Its power draw and full-speed noise are not published.
Amazon $94.90$94.908 in807 CFM-- - Hon&Guan PRO 8 in Inline Fan#3 of 9Full review
A low-cost 8 in EC fan with strong rated airflow. Its power draw is not published, which keeps it below documented rivals.
Amazon $99.99$99.998 in830 CFM-42 dBA
