Get Clean Compressed Air by Using the Correct Filter

Compressed air filters protect your equipment from dust, dirt, oil and water. Dust will wear down your equipment and can make pneumatic control valves get stuck. Especially when the dirt and dust is combined with oil (which is often the case with compressors), a sticky mess can form inside valves, motors and other compressed air equipment.

To protect your equipment, you need to install the right compressed air filter. And, to maintain efficient operation of filters, the filter elements need to be replaced periodically.

Types of filters include:

•  Compressed intake filters – the first line of defense in filtering. These filters can remove contaminates down to 0.3 µm and can remove chemical contaminants
•  Particulate filters – used to remove dust and particles from the air
•  Activated carbon filters – utilize a composite carbon material to remove gases and odors from the air. They are used in factories where food is produced or for breathing gas.
•  Coalescing filters – removes water and oil aerosols by coalescing the aerosols into droplets
•  Cold coalescing filters – operate at around 35 °F (2 °C), allowing them to be more effective at removing moisture

Unfiltered compressed air frequently contains dust, oil, rust, moisture and other harmful substances, and therefore requires filtration. In the first stage of filtration, the compressed air passes through a tube-shaped mesh filter, which creates a coalescence effect. Here bigger particles are adsorbed on the filter and the water will condense into larger droplets, which can then pass into the separation chamber. The compressed air is slowed down, which makes the particles condense on a honeycomb-like pad, allowing the water droplets to travel to the bottom of the drainage system and through an automatic or electric drain valve to the discharge. In the first filtration stage more than 95% of the water droplets, oil and large particles are removed. This practice is most common for removing water, but is also used for removing oil.

In the second filtration stage, the air is passed through fiber made of cotton generating thousands of small vortices and accelerating the air.

The right compressed air preparation is essential for reducing machine downtime, and for reducing maintenance and energy costs. Following a properly scheduled maintenance is crucial to maintaining not only performance and efficiency, but also maximizing the life expectancy of your compressed air system equipment.

Regularly Changing your Filters will Increase Performance and Extend the Operating Life of your Air Compressor


Pleated design greatly increases air filter surface area
• Reduced pressure drop
• Filter efficiency of over 97%

Rugged metal reinforcing of element
• Insure leak-free operation
• Reduce the possibility of puncture or collapse



Proprietary filter media designed for air compressors
• Reduced pressure drop
• 99.999% efficiency to 0.3 micron
• Extends separator useful life

Rugged metal reinforcing of element
• Reduce the possibility of puncture or collapse

Designed to eliminate static electricity build up
• Reduce the risk of fire internally



Proprietary filter design
• 30 – 50% greater filter medium surface area
• High efficiency rating

Higher pressure performance rating due to thicker shell
• Reduce the possibility of puncture or collapse

Leak tight filter element design
• Inner seal prevents bypassing of oil filter element

Would you like to be reminded of upcoming maintenance for your equipment?  Contact us today and we can put together a parts list and air compressor maintenance checklist program kit for you!

Email our Compressor Parts Department. You can also call us at  800.582.5162.

As a leading provider of premium quality compressed air and automation solutions since 1938, John Henry Foster delivers customized automation products and design-to-build solutions to clients in Minnesota, Wisconsin, North Dakota, South Dakota and northern Iowa. Our talented and innovative employees serve customers in virtually every industry that utilizes motion control technology and power generation.

For updates and other information about John Henry Foster, visit our website, Like us on Facebook or follow JohnHenryFoster on Twitter.


Contact Us

651-452-8452 | 800-582-5162


Do you want to receive future marketing messages from John Henry Foster? Yes


Signup to our newsletter below