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Compressed Air Dryers

If you've worked with an air compressor, you've likely noticed the air is saturated with moisture. This is because water, in contrast to air, is incompressible. The amount of moisture per volume unit increases when air is compressed, creating condensation. Our compressed air dryers are vital for removing this moisture, which can cause corrosion, quality issues, and microorganisms in your air system.

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What is a compressed air dryer?

As referenced, dryers remove excess water from compressed air. With the right type, you'll meet industry standards while protecting your air compressor setup.

There are three types of dryers to consider, refrigerant (fridge), adsorption, and membrane. Each comes with its own benefits to help you balance budgetary concerns and air quality standards.

How do different compressed air dryer types work?

Refrigerant (fridge)
Refrigerant dryers are the most common type, and typically maintain a PDP of +3 °C/37.4 °F, suitable for most applications. They consist of an air-to-air heat exchanger and air-to-refrigerant heat exchanger. This type of dryer is either air-cooled or water-cooled. Pneumatech also offers non-cycling, cycling and VSD fridge dryers to meet your investment and efficiency requirements.


Adsorption / desiccant
Adsorption or desiccant dryers use hygroscopic material like silica gel to adsorb moisture contained in compressed air. The air flows over the material and is effectively dried. These dryers achieve a PDP from -10 °C/14 °F to -70 °C/-94 °F.

To maintain consistent operations, adsorption dryers come with two drying vessels. The first is used for drying incoming compressed air, while the second is used for desiccant regeneration. There are three types of regeneration methods our dryers use: purge regeneration (“heatless-type dryers”), heated purge, and blower.


Membrane dryers use a process called "selective permeation." They consist of a cylinder housing thousands of tiny hollow polymer fibers with an inner coating. Through selective permeability, these fibers remove water vapor, achieving standard PDP levels of +3 °C/37.4 °F.

The right PDP & dryer for your application

PDP is used to define the water content in compressed air. Essentially, it is the temperature at which water vapor condenses at the working pressure. Low PDP values indicate small amounts of moisture in compressed air.

The benefits of compressed air dryers

In addition to ensuring the reliability and integrity of your air system, compressed air dryers are essential for meeting ISO 8573-1 standards. This internationally recognized rating dictates how many contaminants, including water, your air is allowed to contain after treatment.


The standard specifies air quality classes, including the acceptable PDP levels. For example, ISO 8537-1 class 1 requires a PDP of -70 °C/-94 °F, while class 4 indicates +3 °C/37.4 °F.

A complete product range

Learn more about our different dryer products here below.

Where are compressed air dryers used?

Compressed air dryers play a vital role in various industrial and professional applications, here are just a few examples.

Compressed air dryers knowledge center

Want to know more about different air compressor dryer types? Check our knowledge library.

Pneumatech air quality equipment - more than just dryers

Pneumatech offers much more than top-quality compressed air dryers:

- As the air treatment and gas generation specialist, we can meet all your compressed air quality and industrial gas needs. This includes a wide range of filtration equipment and air quality measurement services.

- Our experts are always ready to help. Just share your air quality requirements and they can put together the optimal system for you.

Contact us

Need help navigating our compressed air dryer offer? Our experts are always ready to put together the solution that best meets your needs.