ONA Air Filter – In-Line Duct Odour Neutraliser 4" to 12"

Most odour control asks you to fight a smell where it ends up. The ONA Air Filter fights it where it's going. Every bit of air leaving your tent or room already passes through one place: the ducting. Put the odour neutraliser there and nothing gets out without meeting it first. One small box in the line turns your whole ventilation run into an odour-control system.

The ONA Air Filter is a stainless duct section with a clip-shut hatch. Cut it into your outgoing ducting, pop the hatch, drop in an ONA Block, and close it. As air rushes past, it picks up ONA's natural essential-oil formula, which bonds with odour molecules and neutralises them rather than just covering them with perfume. It's available in all six duct sizes, 4" to 12".

Why use one

• Treats every cubic metre that leaves. Air can't go round it, because it is the duct.
• No power, no filters to change. Just swap the ONA Block when it's used up.
• Works with or without a carbon filter. On its own it handles light odours. After a carbon filter it's a belt-and-braces backup that catches anything the carbon misses, which is especially useful as a carbon filter nears the end of its life.
• Room for more in bigger sizes. The 8", 10" and 12" have space for more than one block when you need extra strength.

How to fit it

1. Choose the ONA Air Filter that matches your ducting size.
2. Cut it into the outgoing (exhaust) ducting run, ideally after your fan and carbon filter.
3. Secure both ends with ducting clips or jubilee clips and seal them with aluminium tape.
4. Open the hatch, drop in an ONA Block (lid off), and clip it shut.
5. When the block has shrunk away, swap in a fresh one.

ONA Blocks are sold separately. You'll find them in our ONA range, in several fragrances.

Not just for growers

• Grow tents and drying rooms
• Kitchen, bathroom and utility-room extract ducting
• Workshops, garages and pet rooms with extraction
• Smoking areas with an extractor fan

Rose's Pro-Tip

"Put it after the carbon, not instead of it. A carbon filter does the heavy lifting and the ONA box mops up whatever slips through. That pairing also buys you time: when the carbon starts tiring, the ONA covers the gap until you replace it, so there's never a day when the smell gets out."

Sizes

FAQ

Is this a carbon filter?
No. It's a duct housing that holds ONA Blocks, which neutralise odour chemically as air passes. For heavy odours, use it alongside a carbon filter.

Does the block come with it?
No, ONA Blocks are sold separately so you can choose your fragrance.

Will it slow my fan down?
Very little. It's a straight duct section, so air flows through it much as it would through normal ducting.