Alen HEPA Air Purifiers

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Alen HEPA Air Purifiers

Bring the most advanced filter technology on the market into your home.


HEPA was originally designed for military use during WWII as protection against nuclear radioactive sources


HEPA is a flat, pleated sheet of fabric composed of millions of microscopic fiberglass threads tightly woven together to capture airborne particles


Using HEPA Filtration, you can remove airborne particles smaller than the diameter of a human hair


Intrigued? Read to learn more about the power of HEPA filtration below or shop our powerful HEPA Air Purifiers.


Surprisingly, during WWII HEPA was used to combat chemical, biological and radiological warfare by removing radioactive dust particles from the air. Essentially, HEPA was (and continues to be) indispensable in protecting people from dangerous airborne particles and is one of the most trusted and safest technologies in air purification today.1


The key to HEPA is pretty simple. At the most basic level, HEPA is a flat, pleated sheet composed of millions of microscopic fiberglass threads tightly woven together. This creates a complex maze where particles like pollen, mold, dander and dust are captured, allowing it to remove a significant amount of airborne particles as small as 0.3 microns.

How Small is a Micron?

A micron is really, really small—so small, in fact, it measures just one-millionth of a meter! To understand just how small this is, the diameter of a single human hair can measure between 70-100 microns thick, while the majority of all airborne particles are smaller than 1 micron.

Particles which may aggravate respiratory issues like asthma or allergies typically measure between 1-10 microns. HEPA removes particles as small as 0.3 microns—almost 100 times smaller than a human hair—making it a safe and effective way to remove irritating particles from your indoor air.

The Magic Behind HEPA

HEPA filtration works to remove particles like a basketball player playing defense against an opponent's shot. As the air moves through the HEPA material, particles are caught by HEPA material using three different mechanisms: interception, impaction and diffusion.


is the action of particles adhering to the interior fiber of the HEPA media.



happens when larger particles bump into HEPA fibers causing them to essentially embed within the HEPA material.



occurs when particles move in a random, zig-zag pattern and raise the probability for it to be captured by either interception or impaction.2

Alen Air Purifiers and HEPA Technology

At Alen, we understand HEPA and believe air purifiers which utilize HEPA type filtration improve your indoor air quality fast and efficiently. All Alen Air Purifiers contain HEPA type filtration and can remove up to 99% of indoor irritants as small as 0.3 microns.


1. Journal of Biological Safety Association, HEPA Filters
2. The Baker Company Blog, How HEPA Filters Work in Clean Benches and Biosafety Cabinets