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.

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.

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.

Adsorption Dryers

Adsorption or desiccant dryers remove moisture from air or gas streams by passing them through a porous material called a desiccant, ensuring dry and moisture-free conditions.

Refrigeration Dryers

Refrigeration dryers are the most commonly used dryers for removing moisture from compressed air. They therefore play an important role in shielding compressed air systems from corrosion and protecting your equipment and end products alike.

Membrane Dryers

Using a process called “selective permeation,” membrane dryers can help remove that moisture to ensure the required air quality standards are met.

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.


Textiles play a crucial role in our lives, high-quality compressed air plays a crucial role in their production. Pneumatech air treatment solutions ensure compressed air for textiles meets the necessary quality requirements.

Pharmaceutical industry

The pharmaceutical sector is among the most highly regulated industries. For good reason. The products manufactured in pharmaceutical plants can ease suffering and save lives. To do so, however, their production must meet stringent quality standards. And that begins with very clean compressed air.

Food & Beverage

Food and beverages are vital in the truest sense of the word. And just as our body needs them to keep going, their producers need high-quality compressed air. After all, they must ensure that the things we eat and drink are safe to consume and that they taste good. Stringent compressed air standards for food industry apply.

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Cement Production

Just like compressed air, cement can be found all around us. Our modern world would be unimaginable without either. Therefore, it makes sense that compressed air plays an important role in the making of cement. However, quality standards do apply for compressed air for cement production. That's because untreated compressed air can compromise the final product.

Compressed air dryers knowledge center

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


Moisture in your compressed air can turn into a very expensive problem that can impact your production processes, your equipment and your end products.

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Why is compressed air wet?

Untreated compressed air always contains contaminants because of the nature of the gas and how it is produced. The need for air treatment basically results from 3 characteristics of compressed air. 

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Selecting the right compressed air dryer

How do you know which type of compressed air dryer will best meet your needs? These insights will help you make the right decision.

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What is a cycling refrigerated dryer?

Refrigerated dryers are the most common type of air treatment dryer used in multiple applications from automotive shops to manufacturing facilities. Refrigerated dryers come in both cycling and non-cycling variants, but what exactly is a cycling refrigerated dryer?

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What can I do to lower the energy cost of my air dryer?

I use multiple refrigeration dryers in my facility, and they are causing the energy cost to be high. What can I do to make my air treatment system more energy-efficient? - Read the answer here.

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I'm opening a brewery: Do I need air treatment?

When air compressors are used in a brewery for bottling, kegwashing, etc., the compression of ambient air pulls in all the humidity and particulates that are floating around in the air. That concentration of liquid and contaminates will get down stream of the compressor and cause many issues for a brewery of any size.

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Why are my pneumatic tools rusting and how can I fix it?

All of your pneumatic tools are rusting and becoming ruined, but you can't figure out why? - Pneumatech can help!

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.

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Aerodyn Group
Main Office (1257403-W)


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