Active Air 8" Inline Duct Fan, 720 CFM

Move Exhaust Air Quietly, Around the Clock, 8"

A carbon filter and a run of ducting only matter as much as the fan pulling air through them, and a fan that's underpowered, noisy, or prone to bearing failure undercuts the whole exhaust setup. Active Air's Inline Duct Fan line runs on a brushless, thermally protected AC motor with sealed-for-life bearings that never need lubrication, housed in a ceramic-coated body with a molded impeller built to move air quietly for the long haul.

This 8" model moves up to 720 CFM, matched to a larger room running an 8" carbon filter.

Key Features & Benefits

• Brushless, thermally protected AC motor — resists overheating under continuous duty and avoids the brush wear that limits the life of simpler fan motors.
• Sealed-for-life bearings — never need lubrication or maintenance, cutting one more task out of routine grow-room upkeep.
• Ceramic-coated housing — resists corrosion in the humid conditions a grow-room exhaust fan runs in day after day.
• Molded impeller for quiet operation — reduces the mechanical noise and vibration a metal-bladed fan tends to add to a room.
• Mounting brackets and 8-foot 120V cord included — ships ready to hang and plug in without a separate hardware or cord purchase.

Who Should Use This Inline Duct Fan

This fan line suits any grower assembling an exhaust run with a carbon filter and ducting, from a single tent needing a couple hundred CFM up to a larger room needing to move air well over 700 CFM. Match the fan's CFM rating to your filter and duct diameter so the whole exhaust chain performs at the level it's rated for.

About Active Air

Inline duct fans sit at the center of Active Air's equipment catalog, the Hydrofarm-built lineup of fans, ducting, filtration, and climate-control gear for indoor grow rooms. Moving air efficiently through a duct run is the starting point most of the brand's other equipment, from filters to controllers, is designed around.

Frequently Asked Questions

How loud is this fan?

Its molded impeller and brushless motor are built for quiet operation compared to fans using simpler motor and blade designs. Noise still increases somewhat at higher speeds, so growers sensitive to sound often run it a notch below its rated maximum.

Do I need to lubricate or maintain the motor?

No, the bearings are sealed for life and never need lubrication. Routine care is limited to keeping the housing and impeller free of dust buildup.

How is it mounted?

It ships with mounting brackets for hanging it inline along a duct run, typically positioned between the carbon filter and the exhaust point. The included 8-foot pre-wired 120V cord reaches a standard outlet without an extension cord in most rooms.

Can it run continuously?

Yes, the motor is thermally protected and built for continuous duty rather than intermittent use, which is standard for a grow-room exhaust fan. The sealed bearings and ceramic-coated housing are part of what lets it run around the clock.

When should I size up to a larger inline fan?

Size up when your current fan can't keep pace with the CFM your carbon filter and duct diameter are rated for, or when room volume and heat load increase, such as adding more lights. Active Air's inline fan line runs from a 4" model at 165 CFM up to a 10" model at 760 CFM, so there's room to scale up without changing brands.