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What is a HEPA Filter?

By Saber más3 min read

What is a HEPA Filter and Why is it so Important?

HEPA stands for “High Efficiency Particulate Air.” A HEPA filter is a type of air filter that captures very small particles, such as dust, pollen, mites, mold spores, and bacteria. These filters are used in various devices, such as air purifiers, vacuum cleaners, and ventilation systems, to keep the air clean and healthy.

Characteristics of HEPA Filters

HEPA filters have some features that make them unique and effective:

filtros hepa
  • They are made of very fine glass fibers, arranged in a random pattern. This creates a network of pores that traps small particles.
  • To be considered HEPA, a filter must be able to capture at least 99.97% of particles 0.3 microns or larger. This is much smaller than the size of most dust and pollen particles.
  • They are very efficient in removing harmful particles, making them ideal for people with allergies or respiratory problems.

How Does a HEPA Filter Work?

The process by which a HEPA filter traps small particles is quite interesting. Here’s how it works:

  • Interception: When air passes through the filter, larger particles collide with the glass fibers and stick to them.
  • Impaction: Smaller particles, moving more quickly, collide with the glass fibers and are also trapped.
  • Diffusion: The smallest and lightest particles, such as gas molecules, move randomly and end up colliding with the glass fibers, which also traps them.
funcionamiento filtro hepa

Thanks to these three mechanisms, HEPA filters can capture a wide variety of particles and keep the air clean.

Where are HEPA Filters Used?

HEPA filters can be found in a wide variety of devices and applications. Some examples include:

cabina de flujo laminar vertical
  • Air purifiers for homes and offices
  • Laminar flow cabinets in laboratories and hospitals
  • Ventilation systems in airplanes and spacecraft
  • Personal protective equipment, such as masks

When and How to Replace a HEPA Filter?

HEPA filters do not last forever, and over time, they fill up with particles and lose their effectiveness. It is important to replace them according to the manufacturer’s recommendations to maintain optimal air quality. The frequency of change depends on the device’s use and the air quality in the environment. Some general guidelines are:

  • Air purifiers: every 6-12 months
  • Laminar flow cabinets: according to the manufacturer’s instructions
  • Masks: when the filter is visibly dirty or there is difficulty breathing

It is important to read the device’s manual to know the manufacturer’s specific recommendations on when and how to change the HEPA filter.

HEPA Filter: Price

The prices of HEPA Filters depend on their destination, use, application, and production. If you want to know the prices of these filters, click on the button below!


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