Air Dryers
Remove water vapor and lower pressure dew point to help prevent downstream condensation, corrosion and freezing.
Dryers & Filters
Complete Compressed-Air Treatment
Compressed Air Dryers & Filters
Build a cleaner, drier compressed-air system with dryers, filters and replacement desiccants selected around airflow, pressure, contaminant type, pressure dew point and application requirements. Browse the appropriate treatment category for moisture removal, particle and aerosol filtration, or regenerative dryer media.
Quick Answer
What Is Compressed-Air Treatment?
Compressed-air treatment removes moisture, particles, lubricant aerosols and other contaminants before the air reaches downstream equipment or processes. Air dryers control water vapor, filters remove specific contaminants, and desiccants provide the adsorption media used in regenerative drying systems.
Shop by Treatment Type
Browse Dryers, Filters & Desiccants
Each treatment category serves a different purpose. Start with the contaminant or moisture requirement, then move into the appropriate product category.
Compressed Air Filters
Remove particles, liquid water, lubricant aerosols and other contaminants depending on filter type and grade.
Compressed Air Desiccants
Replacement adsorption media such as activated alumina is used in regenerative dryers to remove water vapor from the compressed-air stream.
| Treatment Type | What It Controls | Best Used For |
|---|---|---|
| Air Dryers | Water vapor and pressure dew point | Preventing downstream condensation, corrosion and freezing |
| Compressed Air Filters | Particles, liquid water and lubricant aerosols | Protecting equipment and achieving required delivered air quality |
| Compressed Air Desiccants | Water vapor through adsorption media | Maintaining regenerative desiccant dryer performance |
Air Quality
What Contaminants Need to Be Controlled?
Different treatment equipment targets different contaminants, so the correct system depends on the delivered air quality required by the application.
Water Vapor
Air dryers reduce water vapor so moisture does not condense as the compressed air cools downstream.
Liquid Water
Separators, drains and appropriate filters remove condensed liquid before it reaches finer treatment stages.
Particles
Particulate filters capture rust, dust, pipe scale and other solid contaminants in the compressed-air system.
Oil Aerosols
Coalescing filters remove fine liquid lubricant aerosols produced by lubricated compressors or introduced downstream.
Oil Vapor
Applications with very strict air-quality requirements may require specialized adsorption treatment after other contaminant stages.
Moisture in Desiccant Systems
Desiccant media adsorbs water vapor and must be regenerated or replaced as its performance declines.
Treatment Sequence
How Dryers and Filters Work Together
Air treatment is most effective when components are arranged in the correct sequence for the compressor type and required delivered air quality.
1. Cooling & Separation Remove bulk liquid water after compression and cooling.
2. Prefiltration Protect downstream dryers and treatment equipment from particles and liquid aerosols.
3. Air Drying Reduce water vapor to the pressure dew point required by the application.
4. Final Filtration Provide the additional contaminant control required at the point of use.
System Selection
How to Choose Compressed-Air Treatment Equipment
Define the required delivered air quality first, then size each treatment stage for the actual operating conditions.
Information to Collect
- Maximum system CFM
- Operating pressure
- Highest inlet temperature
- Highest ambient temperature
- Required pressure dew point
- Primary contaminant types
- Required filtration level
- Maximum acceptable pressure drop
- Application or product-contact risk
- Future expansion requirements
Start With Air Quality, Not One Component
A dryer does not replace filtration, and a filter does not remove water vapor. The correct treatment system combines components according to moisture, particle, aerosol and process requirements.
Review the Air Treatment System Design Guide before final equipment selection.
Moisture Requirement
Pressure Dew Point Determines Dryer Selection
Pressure dew point defines the temperature at which water vapor will begin condensing at compressed-air system pressure. General indoor systems may use refrigerated drying, while lower dew-point or freeze-protection requirements commonly call for desiccant drying.
Learn more in the Pressure Dew Point Guide .
Define Before Selection
- Coldest downstream temperature
- Required pressure dew point
- Process moisture sensitivity
- Indoor or outdoor piping
- Required delivered air quality
Air Dryer Categories
Refrigerated vs. Desiccant Drying
Refrigerated Air Dryers
Refrigerated dryers cool compressed air so water vapor condenses and can be separated. They are widely used for general indoor plant air.
Desiccant Air Dryers
Desiccant dryers use adsorption media to achieve lower pressure dew points for freeze protection and moisture-sensitive applications.
Related Resources
Continue Planning Your Air Treatment System
Air Treatment System Design Build the correct sequence of separators, filters, dryers and drains. Compressed Air Dryer Sizing Calculator Estimate corrected dryer capacity using airflow and actual operating conditions. Compressed Air Filtration Guide Compare filter types, contaminants and filtration requirements. Air Dryers Compare refrigerated and desiccant moisture-control technologies. Compressed Air Filters Browse particulate, coalescing and other air-treatment filters. Compressed Air Desiccants Find replacement adsorption media for regenerative dryer systems.
Frequently Asked Questions
Compressed Air Dryers & Filters FAQs
What equipment is used to treat compressed air?
Compressed-air treatment may include aftercoolers, separators, drains, particulate and coalescing filters, refrigerated or desiccant dryers and additional adsorption treatment depending on the required air quality.
Do I need both an air dryer and a filter?
Many systems require both because dryers control water vapor while filters remove particles, liquid water and lubricant aerosols. The correct combination depends on the application and required delivered air quality.
What is the difference between an air dryer and a compressed air filter?
An air dryer reduces water vapor and pressure dew point. A compressed-air filter removes specific contaminants such as particles, liquid water or lubricant aerosols.
How do I choose a compressed air dryer?
Choose a dryer based on maximum airflow, operating pressure, inlet and ambient temperature, required pressure dew point and whether the system may be exposed below freezing.
How do I choose a compressed air filter?
Identify the contaminants that must be removed, required delivered air quality, maximum airflow, operating pressure and acceptable pressure drop before selecting a filter type and grade.
What pressure dew point do I need?
Required pressure dew point depends on the coldest downstream temperature and moisture sensitivity of the process. Indoor general plant air often requires a moderate dew point, while outdoor or sensitive systems may need much drier air.
What is compressed air desiccant used for?
Desiccant is an adsorption media used in regenerative air dryers to capture water vapor. Common media include activated alumina and molecular sieve depending on dryer design and required dew point.
When should air dryer desiccant be replaced?
Desiccant should be evaluated or replaced when dew-point performance declines, pressure drop increases, beads break down or contamination reduces adsorption performance.
Where should dryers and filters be installed?
Treatment equipment is commonly installed downstream of the compressor and bulk-liquid separation equipment. Exact filter and dryer sequence depends on the dryer technology, compressor type and required air quality.
How do I design a complete compressed air treatment system?
Start with maximum airflow, pressure, contaminant types, required pressure dew point and application risk. Then select separators, filtration, drying and drainage stages in the correct sequence for those requirements.
Need Help Planning Your Compressed-Air Treatment System?
Have your maximum CFM, operating pressure, inlet temperature, ambient temperature, required pressure dew point, contaminant concerns and application ready. An air-treatment specialist can help identify the appropriate dryers, filters, desiccants and supporting equipment.
Product Education
Learn More About Compressed Air Dryers & Filters
Watch this overview for additional guidance on compressed-air moisture control, filtration, treatment stages and equipment selection.
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