Particles
Particulate Filters
Remove rust, scale, dust and other solid contamination.
Compressed Air Filter Buyer's Guide
How to Choose a Compressed Air Filter
The right compressed air filter depends on what must be removed, where the filter is installed and how much pressure drop the system can tolerate. This guide compares particulate, coalescing and activated carbon filtration.
Quick Answer
Use a particulate filter for solid contamination, a coalescing filter for fine oil and water aerosols, and activated carbon filtration when the application requires additional vapor or odor reduction. Size every filter for peak corrected CFM and acceptable pressure drop.
Key Concepts
Aerosols
Coalescing Filters
Remove fine liquid water and oil aerosols from compressed air.
Vapor
Activated Carbon Filters
Reduce vapor-phase oil and odor after liquid aerosols are removed.
Selection Guide
Practical Selection and Troubleshooting Guide
| Condition | Recommended Starting Point | Why | What to Verify |
|---|---|---|---|
| Rust, pipe scale or dust | Particulate filter | Removes solid contamination | Confirm micron rating and peak airflow. |
| Oil or water aerosol | Coalescing filter | Combines fine droplets so they can drain | Install reliable drainage and bulk-water separation upstream. |
| Oil vapor or odor | Activated carbon filter | Adsorbs vapor-phase contamination | Use after aerosol removal and replace media on schedule. |
| Desiccant dryer outlet | Particulate after-filter | Captures desiccant dust | Follow the dryer manufacturer's filter grade. |
Interactive Tool
Preliminary Recommendation
Primary recommendation—
Supporting action—
Next step—
Common Mistakes
Sizing to Average Flow
Use peak corrected airflow so the component performs during the highest real demand.
Ignoring Pressure Drop
Dirty or undersized components can reduce downstream pressure and increase compressor energy use.
Skipping Maintenance
Drains, filters, dryers and piping must be inspected before performance declines.
Shop Relevant Equipment
All Types
Compressed Air Filters
Browse particulate, coalescing and other filter options.
Complete Treatment
Dryers & Filters
Browse filters with compatible drying equipment.
Bulk Moisture
Water Separators
Remove entrained liquid before fine filtration.
Need Help Confirming the Correct Selection?
Provide airflow, pressure, temperature, application, equipment type and the problem you are trying to solve.
Related Air Treatment Resources
How to Choose a Compressed Air Filter FAQs
What type of compressed air filter do I need?
Choose by contaminant: particulate for solids, coalescing for aerosols and activated carbon for vapor-phase contamination.
What micron rating should I choose?
Use the rating required by the dryer, equipment or process. Finer is not always better if it causes excessive pressure drop.
Where should a coalescing filter be installed?
It is commonly installed before a dryer or at a point of use, depending on the contamination risk.
Does activated carbon remove liquid oil?
It is intended mainly for vapor and odor reduction and should be protected by upstream aerosol removal.
How do I size a compressed air filter?
Use peak corrected CFM, operating pressure and acceptable differential pressure.
How often should filter elements be replaced?
Follow the manufacturer schedule and replace based on hours, differential pressure and air-quality performance.