Inline Fans

Inline fans exhaust heat, humidity and odor through a carbon filter, holding a grow space steady from tent to warehouse room. Tents run a 4 or 6 inch EC fan and rooms an 8 to 12 inch fan. Commercial spaces step up to 14 inch and larger.

119 products

Inline Fans

Inline Fans: Duct Fans for Grow Tents and Rooms

Inline fans sit in the duct run and pull hot, humid air out of a grow space, usually through a carbon filter. The same fans also push fresh air in. This collection runs from 4 inch tent fans to 24 inch commercial units. Not sure of the size? Our guide to what CFM fan you need walks through it....

Inline fans infographic: EC and AC duct fans, booster fans, fan and filter kits, CFM by duct size, quiet setup

To browse by airflow, see fans by CFM. Pair an exhaust fan with one of our carbon filters, all within the wider fans and ducting range.

Types of Inline Duct Fans

EC Inline Fans

EC fans run on variable speed and hold a set point quietly. The Gorilla GXi 6 moves 402 CFM on 60 watts, and the Ruck 6 inch S-Prime EVO EC moves 430 CFM on 72 watts. AC Infinity CLOUDLINE and ThinkGrow Aero-Fan add smart controllers.

AC Mixed Flow and Centrifugal Fans

Can-Fan Max Fan Pro, Fantech Stratos, Vortex and Ruck Prime fans use AC motors. The Can-Fan Pro 6 has a built-in 3-speed switch, starting at 291 CFM on low. Large rooms step up to Ruck Prime models from 14 to 24 inches.

Booster Fans and Kits

The AC Infinity RAXIAL S6 boosts a duct run to 265 CFM, often as an intake. Filtration kits pair a fan, carbon filter and 25 feet of ducting, and Common Culture combos cover 4 and 6 inch tents.

How Growers Set Up an Inline Fan

Size the fan to the room, then add headroom for the filter and duct. Run it on a speed controller rather than full blast. Lower speeds cut noise and hold humidity steadier overnight.

Frequently Asked Questions

What size inline fan for a 4x4 grow tent?

A 4 x 4 x 7 foot tent holds 112 cubic feet. That calls for about 150 CFM with 30% added for the filter and ducting. Most growers run a 6 inch fan for headroom. Gorilla notes that 6 inches is the size most 4x4 and 5x5 tents settle on.

How do you make an inline fan quieter?

Start with a quiet fan and run it below full speed. The Gorilla GXi 6 is rated at 32 dB-A and the RAXIAL S6 at 35 dBA. Sound-insulated casings, like the Ruck S-Prime and Vortex S-Line, damp noise off the fan body.

What is a mixed flow inline fan?

A mixed flow fan blends axial and centrifugal airflow to build static pressure in a compact body. Fantech says its Stratos keeps pulling through a carbon filter and long duct runs where a basic axial booster would stall. Can-Fan, Ruck Prime and CLOUDLINE fans also use mixed flow.