ONA

ONA Air Filters Odour Neutralisers

£19.95

Tax included. Shipping calculated at checkout.

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Pickup available at Sheffield store

Usually ready in 1 hour

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Shipping & Returns

Our current shipping rates are as follows:

UK Orders Over £95.00 – Free Next Day Delivery
UK Orders Under £95.00 – £8.95 For Next Day Delivery With DX Or We Offer Tracked 48 & 24 Services With Royal Mail
UK Orders Next Day AM – £20
UK Orders Saturday AM – £30
International Orders DAP – We can ship worldwide - Please note that any customs fees, import taxes or duties are the responsibility of the customer.

All parcels are fully tracked. Once your order has been dispatched, you’ll receive an email containing your tracking number.

If your order is classed as an oversized item OR deemed extra heavy, additional heavy shipping duty will be added at checkout when selecting your shipping options.

Returns

We want you to be completely satisfied with your purchase, but if you change your mind, you may cancel your order within 14 days of receipt for a full refund, provided the items are unused and in resalable condition.

Once your cancellation has been confirmed, you must return the items within 14 days, ideally in their original packaging.

Click & Collect

Order online and collect directly from our Sheffield OR Barnsley store. Once your order is ready, you’ll receive an email or phone confirmation with collection details. Please wait for confirmation before travelling to ensure your order is prepared.

Please have your order number ready to give to a member of staff when you arrive.

Sheffield Store:
GSH Retail Ltd
Unit 5, 230 Woodbourn Road
Sheffield
S9 3LQ

Barnsley Store:
GSH Retail Ltd
Unit 6, Rockingham Business Park
Rockingham Row, Birdwell
Barnsley, S70 5TW

Local Same Day Delivery Service

Our man in a van!

Same-Day Delivery Service

Enjoy fast, reliable, and fully discreet same-day delivery with Green Spirit when you order from our Sheffield store area.Whether you shop online or
in-store, we make getting your items easy,convenient, and secure.

Order Online

When placing your order through our website, simply select the Same-Day Local Delivery option at checkout.

Free Same-Day Delivery on orders over £250.00
Available customers within a 3-mile radius of our Sheffield store (S9 3LQ)
Orders under £250.00 can still be delivered the same day for a £50.00
flat fee

Your order will be prepared and delivered directly to your
door the very same day, using our discreet delivery service.

Order In-Store

If you prefer to shop in person, visit our Sheffield
location to browse, purchase, and arrange delivery.

Pay
in full for your items in-store
Choose
a delivery time and date that suits you best
Our
team will ensure a smooth and convenient handover

Discreet Delivery Promise

We understand the importance of privacy.

All
our delivery vans are plain and unmarked, with no company
branding
Parcels
are packaged in plain or black wrapping for complete discretion

Delivery Requirements

To ensure everything runs smoothly:

Customers
must be present at the agreed delivery time
Drivers
cannot wait for extended periods
If
the customer is not available, items will be returned to the store and a £50.00
redelivery fee will apply

Upon
delivery, we will request a order number, name and signature to
confirm receipt

Discreet Shipping

All orders from GSH Retail Ltd are packed securely and shipped in Plain unbranded boxes for your privacy. We understand that discretion is important, so no external markings or product details are visible on the packaging.

Each parcel is also wrapped in durable black film and sealed with fragile tape to ensure both security and protection in transit.

We take great care to make sure your order arrives safely, discreetly, and in perfect condition — every time.

Methods Of Payment

We accept a wide range of secure payment options for your convenience when shopping with GSH Retail LTD

You can pay using:

Visa, Mastercard, American Express, and Discover

Apple Pay, Google Pay, and Shop Pay

PayPal – Fast and secure online checkout with buyer protection

Klarna – Flexible payment options, including Pay in 3 instalments or Pay Later

Clearpay – Split your purchase into four interest-free payments

Weston Union– Supported for international customers

Cash In The Post - This is at your own risk! Please make sure it is signed for, tracked, and insured.

Manual Bank Transfer - Contact a member of staff to organise paying via bank transfer.

All transactions are processed securely through Shopify’s encrypted checkout. Your payment details are never shared directly with us.

Once your order is placed, you’ll receive an order confirmation email, followed by tracking details once your parcel has been dispatched.

Finance Options

We offer flexible finance options to make purchasing easier. You can choose to spread the cost of your order, all three options are interest-free and give you the flexibility to manage your payments in a way that suits you.

PayPal Pay in 3

PayPal Pay in 3 allows you to divide your purchase into three equal interest-free payments over two months. The first payment is made at checkout, followed by two automatic payments each month.
It is available on orders between £30 and £2,000, and approval is completed instantly through your PayPal account. You can view, manage, or make payments easily through the PayPal app or your online account.

Shop Pay

Shop Pay Installments lets customers pay for an order in smaller increments over time.When available, Shop Pay Installments is a great option to help you maximize your budget for orders between the following amounts, depending on your location:

Klarna

Klarna offers two flexible ways to pay. With Pay in 3 instalments, your order total is divided into three equal payments, taken every 30 days with no interest or fees when paid on time. Alternatively, you can choose Pay Later in 30 Days, allowing you to receive your order first and settle the balance within 30 days. Klarna provides instant approval at checkout, and all payments can be managed securely through the Klarna app.

Clearpay

Clearpay lets you spread the cost of your purchase into four equal interest-free payments, taken automatically every two weeks. The first instalment is paid at the time of purchase, and the remaining three are collected automatically over six weeks. Clearpay is available for orders between £30 and £1,000 and can be managed easily through the Clearpay app.

Important Information

All finance options are subject to eligibility and approval by the provider. Late or missed payments may affect your credit score, so please ensure funds are available when payments are due. For details about eligibility, limits, or payment schedules, please refer to the provider’s website or app.

Earning Points & Rewards

At GSH Retail we believe loyalty should be rewarded - Our Points & Rewards scheme allows you to collect points every time you shop and redeem them for discount codes to use on future purchases.

When you make a purchase through our website, you’ll automatically earn points based on the value of your order. These points are added to your account and can be saved or redeemed whenever you choose. Once you’ve collected enough points, you can exchange them for a unique coupon code that can be applied at checkout to reduce the cost of your next order.

Earn 5 Points for every £1 spent
Redeem 100 Points for £1 Store Credit

Your points never expire as long as your account remains active, and you can track your balance easily through your customer account dashboard. It’s our way of saying thank you for choosing GSH Retail Ltd

To redeem your points, simply log into your account, view your available balance, and follow the on-screen instructions to generate a discount code. Enter the code at checkout to instantly apply your reward.

ONA Air Filters – In-Line Duct Odour Neutralisers for 4" to 12" Ventilation Systems

The ONA Air Filter is an innovative in-line odour control accessory designed to help neutralise unwanted smells directly within your ventilation system. Compatible with ONA 170g Odour Neutralising Blocks, these specially designed duct-mounted dispensers provide continuous odour management as air passes through your extraction system.

Ideal for indoor gardens, hydroponic grow rooms, horticultural facilities, workshops and other ventilated environments, ONA Air Filters offer a convenient way to introduce odour-neutralising ingredients into an existing air extraction setup.

Available in six duct sizes – 4" (100mm), 5" (125mm), 6" (150mm), 8" (200mm), 10" (250mm) and 12" (315mm) – the range is designed to accommodate a wide variety of ventilation systems, from smaller grow tent installations to larger extraction networks.

Simply select the correct duct diameter, install the ONA Air Filter into a compatible ventilation run and insert the required number of ONA Blocks. As extracted air passes through the unit, it circulates around the blocks, helping distribute their odour-neutralising ingredients into the airflow.

The result is a practical, reusable odour control accessory that works with your existing ventilation equipment without requiring a separate electrical connection.

Please Note: ONA Blocks are sold separately. This product is an in-line odour-neutralising dispenser, not an activated carbon filter or dust filtration device.

Key Features & Benefits

In-line odour neutralisation: Designed to help reduce unwanted smells within a ducted ventilation system.
Compatible with ONA Blocks: Uses ONA's 170g solid odour-neutralising blocks as the active consumable.
Six duct sizes available: Choose 100mm, 125mm, 150mm, 200mm, 250mm or 315mm.
Continuous operation: Distributes odour-neutralising ingredients whenever air flows through the unit.
No separate power supply: Uses the airflow generated by your existing extraction fan.
Reusable construction: Replace depleted ONA Blocks without replacing the complete dispenser.
Accessible refill compartment: Removable lid allows the blocks to be replenished.
Sealed lid design: Metal access lid with a rubber seal helps limit unwanted air leakage.
Internal mesh holder: Keeps ONA Blocks positioned within the duct-mounted dispenser.
Suitable for different extraction setups: Designed for compatible indoor gardening and commercial ventilation systems.
Easy to integrate: Can be fitted into an existing ducting run with appropriately sized connections.
Flexible fragrance selection: Choose compatible ONA Blocks in your preferred fragrance.

How Do ONA Air Filters Work?

Unlike a traditional carbon filter, which uses activated charcoal to adsorb certain airborne contaminants and odour compounds, the ONA Air Filter works by introducing odour-neutralising ingredients into moving air.

The unit contains an internal mesh compartment designed to hold compatible ONA Blocks. When connected to an operating ventilation system, air passes through the housing and around the exposed blocks.

The airflow encourages the release and distribution of the ONA formula, helping neutralise unwanted odours travelling through the ducting.

This provides a convenient way to incorporate ONA's odour-neutralising technology into an existing extraction system.

The filter continues to distribute the active ingredients while suitable airflow is present and the ONA Blocks remain effective.

Important: ONA Air Filters do not mechanically capture dust, pollen or other airborne particles and should not be treated as a replacement for ventilation or appropriate particulate filtration.

Available ONA Air Filter Sizes

The ONA Air Filter range is available in six sizes to match commonly used UK ventilation duct diameters.

ONA Air Filter 4" – 100mm

The 100mm ONA Air Filter is designed for compatible 4-inch ducting and extraction systems. It is a practical option for smaller ventilation installations where a compact in-line odour-neutralising dispenser is required.

ONA Air Filter 5" – 125mm

The 125mm ONA Air Filter fits compatible 5-inch ducting, providing an odour-neutralising accessory for ventilation systems using this popular intermediate duct diameter.

ONA Air Filter 6" – 150mm

The 150mm ONA Air Filter is designed for 6-inch ducting and is suitable for compatible medium-sized extraction installations.

ONA Air Filter 8" – 200mm

The 200mm ONA Air Filter is intended for larger 8-inch ventilation systems, allowing ONA Blocks to be incorporated into higher-capacity ducting installations.

ONA Air Filter 10" – 250mm

The 250mm ONA Air Filter provides an in-line odour-neutralising option for compatible 10-inch ducting systems used in larger ventilation setups.

ONA Air Filter 12" – 315mm

The 315mm ONA Air Filter is the largest size available in this listing and is designed for compatible 12-inch ducting and larger extraction systems.

Choosing the Correct Size: Match the ONA Air Filter to the nominal diameter of your existing ducting. Always check the dimensions of your ventilation components before ordering.

Designed for Use with ONA 170g Blocks

ONA Air Filters are designed to work with ONA 170g Odour Neutralising Blocks, which contain a solid formulation of odour-neutralising ingredients.

As air passes around the blocks, the active ingredients are distributed into the extraction airflow, helping reduce unwanted smells.

ONA Blocks are available in a selection of fragrances, allowing users to choose a scent that suits their environment.

The number of blocks required will depend on the size of the dispenser, airflow and the intensity of the odour problem. Always follow the manufacturer's instructions for loading the unit.

Need replacement blocks? Browse our ONA Blocks 170g to choose your preferred fragrance.

Continuous Odour Control Through Your Extraction System

One of the main benefits of the ONA Air Filter is its ability to work alongside an existing extraction fan.

Once installed, the unit uses the airflow already moving through the ducting to distribute the odour-neutralising formula.

This removes the need for a separate fan-powered ONA dispenser and provides odour control during normal ventilation operation.

The system continues to operate until the ONA Blocks become depleted, at which point they can be replaced through the access opening.

Because the dispenser relies on the extraction system's airflow, performance will vary according to fan speed, duct configuration and operating conditions.

Reusable Design with Replaceable ONA Blocks

The ONA Air Filter is designed for ongoing use, with a refillable internal compartment that holds the ONA Blocks.

When the blocks become depleted, simply stop the ventilation system, open the access lid and replace them with fresh compatible blocks.

This means the main filter housing can remain part of the ventilation installation while the odour-neutralising consumables are replenished as needed.

The removable metal lid includes a rubber seal designed to help maintain a secure closure during normal operation.

Suitable for Grow Rooms & Hydroponic Ventilation

The ONA Air Filter is designed for use with suitable ventilation systems found in indoor horticultural environments.

It can be installed within an extraction duct to help manage unwanted odours associated with indoor gardening, plant cultivation and general horticultural workspaces.

Its range of duct diameters makes it suitable for a variety of compatible systems, including grow tents, grow rooms and larger indoor gardening facilities.

Important: Avoid directing fragranced exhaust air back towards sensitive plants, flowers or exposed produce where fragrance transfer could be undesirable.

Ideal Applications for ONA Air Filters

Indoor grow tent extraction systems
Hydroponic grow room ventilation
Horticultural extraction ducting
Ventilated workshops
Suitable commercial ventilation systems
Indoor gardening odour management
Supplementary extraction odour control
Ventilation systems using compatible ONA Blocks

For stronger or persistent odour problems, use the ONA Air Filter as part of a wider ventilation and odour control strategy. An appropriately sized activated carbon filter may also be required, depending on the application.

ONA Air Filter vs Activated Carbon Filter

Although both products can help manage unwanted smells, ONA Air Filters and activated carbon filters work differently.

ONA Air Filter

An ONA Air Filter holds solid ONA Blocks inside an in-line duct housing. Moving air passes around the blocks and carries their odour-neutralising ingredients through the ventilation system.

Activated Carbon Filter

An activated carbon filter contains porous charcoal designed to adsorb certain gases and odour-causing compounds as air passes through the carbon bed.

Which Should You Choose? ONA Air Filters are useful for introducing ONA's odour-neutralising formula into a ventilation system. Activated carbon filters are intended to remove suitable odour compounds from the passing air. The two technologies can be used as complementary odour management methods where appropriate.

How to Install an ONA Air Filter

Select the correct size: Choose an ONA Air Filter that matches the nominal diameter of your ventilation ducting.
Switch off the extraction system: Disconnect the fan from its power supply before installation.
Choose a suitable installation position: Identify an accessible section of ducting where the dispenser can be securely fitted.
Connect the housing: Fit the ONA Air Filter into the ventilation run using compatible ducting connections and appropriate clamps or fittings.
Secure the unit: Ensure the housing is adequately supported and does not place excessive weight on flexible ducting.
Open the access lid: Remove the lid to reach the internal block holder.
Insert ONA Blocks: Remove the required blocks from their packaging and position them securely inside the designated mesh compartment.
Close the lid: Ensure the rubber seal is correctly seated and the access lid is securely closed.
Restart ventilation: Switch the extraction system on and check the duct connections for unwanted air leakage.
Monitor performance: Inspect and replace the blocks as required to maintain effective odour control.

Installation Advice: Always ensure the unit is installed in accordance with the manufacturer's instructions. Keep access available for future block replacement and avoid unnecessary restrictions to airflow.

ONA Air Filter Technical Specifications

Specification	Details
Brand	ONA
Product	ONA Air Filter
Product Type	In-Line Duct Odour-Neutralising Dispenser
Compatible Consumable	ONA Blocks 170g
Available Sizes	4", 5", 6", 8", 10", 12"
Metric Duct Diameters	100mm, 125mm, 150mm, 200mm, 250mm, 315mm
Installation Type	In-Line Ventilation Ducting
Dispensing Method	Airflow-Assisted ONA Block Distribution
Power Required	No Separate Power Supply
Housing	Metal Duct-Mounted Construction
Internal Holder	Mesh Block Compartment
Access Lid	Removable Metal Lid with Rubber Seal
Reusable	Yes – Replace ONA Blocks as Required
Primary Function	Odour Neutralisation in Ventilation Airflow
Typical Applications	Indoor Gardens, Grow Rooms and Compatible Extraction Systems

ONA Air Filter Size & Product Code Guide

Size	Duct Diameter	ONA Product Code
4"	100mm	MC/PAF/4
5"	125mm	MC/PAF/5
6"	150mm	MC/PAF/6
8"	200mm	MC/PAF/8
10"	250mm	MC/PAF/10
12"	315mm	MC/PAF/12

What's Included?

1 × ONA Air Filter Housing in Your Selected Duct Size
Integrated Mesh ONA Block Holder
Removable Access Lid with Rubber Seal

Please Note: ONA Blocks, extraction fans, ducting and installation clamps are not included unless otherwise specified.

Maintenance & Replacing ONA Blocks

Switch off the extraction fan before opening the dispenser.
Inspect the ONA Blocks periodically for depletion.
Replace blocks when their odour-neutralising performance decreases.
Keep the internal mesh holder clear of loose material and debris.
Check the access lid and rubber seal for damage.
Ensure all duct connections remain secure and airtight.
Inspect the housing for signs of corrosion or damage.
Do not overload the block holder or obstruct the ventilation pathway.
Keep the unit accessible for routine maintenance.

Why Choose ONA Air Filters?

The ONA Air Filter range provides a straightforward way to incorporate ONA's odour-neutralising technology directly into an existing ventilation system.

With six available duct sizes, a reusable metal housing and a convenient refillable ONA Block compartment, these in-line dispensers offer a flexible approach to ongoing odour management.

Unlike powered room dispensers, the ONA Air Filter uses the airflow already generated by your extraction system, making it an efficient and practical addition to compatible ventilation setups.

ONA Air Filters – In-Line Odour Neutralisation for 4" to 12" Ducting

Upgrade your ventilation odour control with ONA Air Filters. Designed for use with ONA 170g Blocks and available in 100mm, 125mm, 150mm, 200mm, 250mm and 315mm sizes, these reusable in-line dispensers help neutralise unwanted smells as air moves through your extraction system.

Simply select your duct size, add compatible ONA Blocks and allow your ventilation system to distribute the odour-neutralising formula.