Many modern air purifiers use more than one filtration stage.
A multi-stage system combines different types of filtration to address different types of airborne particles and odors.
Pre-Filtration
The first stage commonly helps capture larger particles before air reaches the finer filter.
This can include:
- Dust
- Hair
- Larger airborne particles
HEPA Filtration
The next stage may use a HEPA filter designed to capture much smaller airborne particles.
Activated Carbon
Some systems also include activated carbon.
This type of filter is commonly used as part of odor and certain gas-related filtration.
Why Multiple Stages?
Each stage serves a different purpose.
Together, multiple filtration layers can create a more comprehensive air purification system.
Conclusion
Understanding the role of each filtration stage makes it easier to compare air purification systems and replacement filters.