What is HEPA Filter?

by Ranjeet Singh Home Appliance Advisor

The promise of an air purifier is tempting: a device that purifies the air in your home by removing all contaminants, including odors, smoke, dust, and pet dander. Given the fact that indoor air can contain up to five times higher levels of certain pollutants than outdoor air, we understand that. Some models can even target bad air seeping into your apartment or house, especially if you live in an area hit by pollution or natural disasters.

HEPA stands for High Efficiency Particulate Air. HEPA filter purifiers filter particles of different sizes in a multilayer network, usually made of very fine strands of glass fibers (much thinner than a human hair!) with different slit sizes. The filter is airtight and consists of thick sheets of small fibers, folded and sealed in a metal or plastic frame.

The air purifier fan draws air into the filter and particles are trapped in the filter. Larger particles (larger than the fiber) are captured by collision (particles are pushed into the fiber), medium-sized particles are caught by capture (particles touch the fiber and are captured), and ultrafine particles are captured by diffusion (while the inner zigzag particles will eventually hit the fiber). and sticks).

What should you pay attention to with an air purifier?

CADR (fresh air delivery rate) assessment. It measures the cleaning speed of the air purifier to remove smoke, dust and pollen. Look for a minimum CADR of 300, over 350 is really great.

Size information. For proper efficiency, you need a model designed for the size of the room. If you want to use it at a lower, quieter setting, choose a model designed to cover a larger area than you'd like. Read More : Why Households Need Air Purifiers in India

AHAM (Association of Home Appliances Manufacturers) A proven brand. The AHAM standards are designed to ensure the safety, efficiency and effectiveness of many household appliances, including air purifiers. The standard is intended to create an understanding between producers and consumers to facilitate the buying process. Although voluntary, most of the leading air purifiers have passed this certification program, which often includes CADR assessment and metrics guidelines.

real HEPA. Genuine HEPA filters effectively remove ultra-fine particles (note: dust, debris, pollen, mold and other common household allergens). The industry standard for this is that the device must be capable of removing at least 99.97% of particles 0.3 micron in diameter in a laboratory setting. Keep in mind that the actual efficiency of these devices will be much lower in real-world conditions as new pollutants continue to emerge. Note that there is no industry standard for the terms "HEPA-like" or "HEPA-type" and the terms are primarily used as a marketing experiment to get consumers to buy products.

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About Ranjeet Singh Freshman   Home Appliance Advisor

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Joined APSense since, March 16th, 2021, From New Ashok Nagar, India.

Created on Jun 30th 2021 05:57. Viewed 381 times.


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