Active Air Inline Carbon Filter, 8" x 30", 750 CFM

Filter Odor Twice in One Compact Duct Section, 8" x 30"

A flanged carbon filter mounted at the end of a duct run only scrubs air once, on its way out, and it has to sit somewhere with room for its full length. Active Air's Inline Carbon Filter solves both problems by building the carbon bed directly into a straight run of ducting: it mounts anywhere along the line, not just at the end, and filters air on its way in through one carbon wall and again on its way out through another.

This 8" x 30" inline filter is built for 8" ducting and rated up to 750 CFM, sized for a larger tent or room running a matching 8" inline fan.

Key Features & Benefits

• Two-stage inline filtration — air passes through carbon on the way in and again on the way out, for a second pass most single-wall filters don't offer.
• 1" carbon bed — packed with activated carbon around the full circumference of the duct, sized to fit into a straight run without a bulky end-mounted housing.
• Mounts anywhere along the duct run — not limited to the very end of the line, which opens up placement options in tight tents, cabinets, or grow closets.
• Compact, ducting-diameter housing — matches standard duct sizes so it drops into an existing run without an adapter.
• Built for tents, cabinets, and tight spaces — sized for setups where a full-length end-mounted filter and matching fan won't fit.

Who Should Use This Inline Carbon Filter

This filter fits growers working in a tent, grow cabinet, or any tight space where there isn't room for a separate end-mounted carbon filter plus fan plus ducting all in a line. It gives a compact setup two-stage odor control without adding much length to the duct run.

About Active Air

Active Air designs its filtration equipment as part of a full indoor-climate lineup that also includes fans, ducting, portable air conditioners, and dehumidifiers, all built by Hydrofarm around maintaining stable grow-room conditions. This inline configuration is one of two carbon filter formats the brand offers, alongside its flanged carbon filter line.

Frequently Asked Questions

How is this different from a standard flanged carbon filter?

A standard carbon filter mounts at the end of the duct run and scrubs air once as it passes through. This inline model builds the carbon bed into a straight section of ducting instead, filtering air on the way in and again on the way out, and it can mount anywhere along the run.

Where should I install it in my duct run?

It can go anywhere along a straight section of ducting between your grow space and your inline fan, not just at the very end. That flexibility helps in tents and cabinets where a full-length end-mounted filter won't fit.

How much airflow can it handle?

The 6" x 24" model is rated up to 500 CFM and the 8" x 30" model up to 750 CFM. Match the model to your duct diameter and your inline fan's CFM rating for the best odor control.

Does it need its own fan?

Yes, this filter doesn't move air on its own; it's designed to be paired with an inline duct fan rated near its CFM mark. The filter and fan work together as a single exhaust run.

When does an inline filter make more sense than a flanged carbon filter?

Choose the inline format when space along the duct run matters more than raw carbon bed depth, such as in a tent or cabinet where a separate end-mounted filter housing won't fit. Choose a flanged carbon filter when you have room for a larger, deeper carbon bed and want maximum odor-scrubbing capacity.