Coalescing Filters
Complete Tanair COF oil-removal coalescing filter assemblies for reducing fine oil aerosols, water droplets and sub-micron contamination in compressed-air systems.
Tanair COF Complete Coalescing Filter Assemblies
The current COF range contains four complete oil-removal filter assemblies for compressed-air systems, with 1/4", 1/2", 3/4" and 1" BSP connections.
Coalescing filtration is used to reduce fine liquid aerosols such as oil mist and water droplets, together with very small particulate contamination.
Select the filter from actual compressor airflow, operating pressure and the required downstream air quality — not BSP connection size alone.
Shop Coalescing Filters
The complete assemblies are shown in model order: COF 6, COF 12, COF 20 and COF 25. Live pricing and stock are pulled directly from WooCommerce.
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Coalescing FilterTanair COF 12 | Filter Assembly ‘Oil Removal’ 1/2″ Bsp (Coalescing Filter)
£135.00 exc vat. Add to basketA Tanair filtration product for cleaner compressed air and improved downstream equipment protection.
In Stock£135.00 exc vat. -
Coalescing FilterTanair COF 6 | Filter Assembly ‘Oil Removal’ 1/4″ Bsp (Coalescing Filter)
£102.00 exc vat. Add to basketA Tanair filtration product for cleaner compressed air and improved downstream equipment protection.
In Stock£102.00 exc vat. -
Coalescing FilterTanair COF-25 | Filter Assembly ‘Oil Removal’ 1″ BSP (Coalescing Filter)
£207.00 exc vat. Add to basketA Tanair filtration product for cleaner compressed air and improved downstream equipment protection.
In Stock£207.00 exc vat. -
Coalescing FilterTanair cof-20 | Filter Assembly ‘Oil Removal’ 3/4″ BSP (Coalescing Filter)
£187.00 exc vat. Add to basketFilter Assembly ‘Oil Removal’ 3/4″ BSP (Coalescing Filter) – an oil-removal coalescing filter assembly for improving compressed air quality in compatible installations.
In Stock£187.00 exc vat.
Choose the Correct Tanair COF Filter
COF 6 · 1/4" BSP
Compact coalescing filter for smaller point-of-use installations and lower-flow compressed-air systems.
COF 12 · 1/2" BSP
Suitable for garages, compact workshops, pneumatic equipment and smaller compressor installations.
COF 20 · 3/4" BSP
For busier workshop and industrial systems requiring a larger oil-removal filter assembly.
COF 25 · 1" BSP
For larger workshop, manufacturing and central compressed-air systems with higher airflow demand.
What Does a Coalescing Filter Remove?
Compressed air passes through fine filtration media where microscopic liquid droplets and aerosols are captured and brought together into larger droplets. These separate from the airflow and collect in the bottom of the filter housing for drainage.
- Fine oil aerosols and oil mist
- Water droplets carried in compressed air
- Very small particulate contamination
- Contamination that can affect pneumatic equipment and downstream processes
Do Not Select by BSP Size Alone
Delivered Airflow
Use the compressor's actual delivered CFM rather than motor kW or theoretical displacement.
Working Pressure
Confirm the housing and element are suitable for the operating pressure of the system.
Connection Size
The BSP connection must suit the pipework, but connection size alone does not prove the filter has sufficient capacity.
Air Quality
Consider the full treatment system, including upstream particulate filtration, dryers and any final activated-carbon treatment.
Typical Uses for Coalescing Filtration
- Workshop and garage compressed-air systems
- Bodyshops and paint-preparation systems
- Pneumatic controls, valves and cylinders
- Manufacturing and engineering machinery
- Additional point-of-use protection for sensitive equipment
Installation & Maintenance Checks
- Install in the airflow direction shown on the housing
- Keep the filter upright so separated liquid can drain correctly
- Provide access for element replacement and bowl servicing
- Check condensate drainage regularly
- Monitor pressure drop across the filter
- Replace the internal element at the required service interval
- Fully isolate and depressurise the air system before servicing
Need Help Matching a Coalescing Filter?
Compressed Air Systems UK can help with filtration sizing, replacement elements, dryers, condensate management and complete compressed-air treatment systems.
Coalescing Filter FAQs
What does a coalescing filter remove?
It is designed to reduce fine liquid aerosols including oil mist and water droplets, together with very small particulate contamination.
How many Tanair COF filters are on this page?
The current range contains four complete assemblies: COF 6, COF 12, COF 20 and COF 25.
Can I choose the filter from the BSP connection?
No. Connection size is only one part of the selection. The filter must also have sufficient airflow capacity and the correct pressure and filtration characteristics.
Does a coalescing filter remove oil vapour?
Coalescing filtration is primarily for liquid oil aerosols. Activated-carbon treatment may be needed where oil-vapour reduction is required.
Where should a coalescing filter be installed?
It is commonly used after suitable upstream particulate filtration and before sensitive downstream equipment. The exact treatment sequence depends on the compressor, dryer and required air quality.
How often should the internal element be replaced?
Follow the applicable service interval and inspect pressure drop, drainage and operating conditions. Replacement frequency depends on use and contamination loading.
Can Compressed Air Systems UK help with sizing?
Yes. Call 0121 753 3330 with the compressor model, airflow, pressure and connection size.
Need Help Choosing a Coalescing Filter?
Send us the compressor details, delivered airflow, operating pressure and pipe size and our team can help identify the correct Tanair COF filter assembly.
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