Collection: HEPA: SETTING THE STANDARD



HEPA             

High-efficiency particulate air, or, HEPA, is a filter used to eliminate unhealthy, irritating and harmful particles and contaminants in the air, such as dust, pollen, pet dander, bacteria, and viruses. HEPA is the efficiency standard of air filtration.  Standards require that a HEPA air filter must remove at least 99.7% of particles 0.3 microns in size, with the filtration efficiency increasing for particle diameters both less than and greater than 0.3 microns. See image below 

HEPA filters consist of a mat of randomly arranged fibers, designed to target a range of particle sizes from .4 to .1 microns.  These particles are trapped in the fiber through a combination of three mechanisms:  Diffusion, Interception and Impaction.


HEPA MECHANISMS

 

                                              

Diffusion:  A mechanism that enhances the collision of gas molecules below 0.1 micrometer to trap particles.

Interception:  Particles in the air stream come together with a fiber and adhere to it at a lower velocity.

Impaction:  Larger particles are forced to embed themselves into the fibers at a higher velocity. 


 

HISTORY OF HEPA

The concept of the HEPA filter came about when a soldier inserted paper into his gas mask during WWII.  The air filter was later improved upon in the 1940's for the Manhattan Project, then commercialized in the 1950s, and the original term became the staple for high efficiency filters. 

HEPA filters are used in contamination control.   They can be beneficial to the safety and cleanliness of many different environments.  For example, in clean rooms, like the manufacturing of disk drives, medical devices, semiconductors and pharmaceutical products.

HEPA can help improve air quality in all spaces such as homes, apartments, dorms, workplaces, offices, restaurants, labs, doctors, warehouses, hospitals, vehicles and fashion.

 

-Check out Airpuria FAQs for more information in air purification. Smell Clean

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