You’re likely to have some familiarity with air purifiers, but have you considered how they actually work? Air purifiers draw in air from a room and pass the air through a filter that captures a range of pollutants. Purified air is then recirculated back into the room. Powered by a fan and a motor, with sufficient coverage the filtration process continually enhances indoor air quality. Think of it this way—air purifiers put you in control of your indoor air, helping you achieve your ideal indoor air quality. Yes! We’ll describe filter types and features of advanced air purifiers, such as an Alen, so you can choose the right air purifier and filter combination for your indoor space. Let’s get into the details.
What is an Air Purifier?
An air purifier is a portable device designed to improve indoor air quality by removing airborne contaminants. It works by drawing air through filters that capture particles such as dust, pollen, pet dander, mold spores, and smoke. High-Efficiency Particulate Air (HEPA) filters, for instance, can remove at least 99.97% of particles as small as 0.3 microns, according to the Environmental Protection Agency (EPA). By continuously cycling air through these filters, air purifiers help reduce pollutants and produce cleaner and healthier indoor air.
How Does an Air Purifier Work?
Air purifiers—powered by a fan and a motor—capture contaminants and release cleaner air. Here’s the step-by-step process:
- Air Intake: The air purifier draws in surrounding air using a fan, ensuring constant circulation to remove airborne pollutants.
- Pre-Filter: Many air purifiers feature a pre-filter designed to trap larger particles like dust, pet hair, and lint, prolonging the life of the HEPA filter.
- Main Filtration: The primary filter, often a HEPA filter, captures microscopic particles like allergens, mold spores, and bacteria. Some units also include filters with an activated carbon layer to absorb odors and volatile organic compounds (VOCs).
- Clean Air Release: The purified air is then pushed back into the room. Advanced models can monitor air quality 24/7 and adjust settings automatically for optimal performance.
Understanding the Different Types of Air Purifier Filters
So, air purifiers use various filters to enhance indoor air. Each is designed to target specific contaminants. Understanding these filter types can help you select the appropriate one for your needs.
HEPA Filters (High-Efficiency Particulate Air)
HEPA filters are the gold standard for air purification, capable of removing at least 99.97% of airborne particles as small as 0.3 microns. These contaminants include dust, pollen, pet dander, mold spores, bacteria, and certain viruses. By trapping these microscopic contaminants, HEPA filters significantly improve indoor air quality, making them ideal for most people—especially allergy sufferers and those with respiratory conditions.
HEPA + Activated Carbon Filters
Activated carbon filters have a highly porous surface that can effectively trap and neutralize odors, smoke, and VOCs. The carbon’s adsorption process binds gas molecules, enabling these filters to remove cooking smells, pet odors, and chemical fumes from indoor air. An essential addition for any household, these filters address multiple concerns. For example, Alen’s Ultimate filter uses activated carbon and an odor catalyst to safely remove gasses emitted from urine and sweat that can cause unpleasant odors. The carbon provides physical absorption while the odor catalyst converts toxic gasses into harmless substances.
Choosing the Right Air Purifier for Your Home
There are a couple of factors to consider when determining what air purifier is best for you. First, measure the room size, which helps ensure that the air purifier's Clean Air Delivery Rate (CADR) matches your room's dimensions. A general guideline is to choose a unit with a CADR that provides at least 2 air changes per hour (ACH) in the space. You should also factor in an air purifier’s filtration efficiency, energy ratings, noise levels, and maintenance requirements. Alen offers a range of air purifiers designed to meet many different needs, featuring HEPA filtration, smart sensors, quiet modes, ENERGY STAR certification, and more to enhance your air quality. Backed by our Forever Guarantee, you can be confident that your Alen air purifier works optimally to maintain your ideal indoor air.
How Air Purifiers Work FAQs
Air purifiers change your indoor air quality from contaminated to clean. Here are answers to other common questions you may have about their use and effectiveness:
1. Is there a downside to air purifiers?
While air purifiers offer significant benefits, some potential downsides include noise levels from mechanical filters and the need for regular maintenance, such as filter replacements.
2. Do air purifiers really make a difference?
Yes, air purifiers can reduce airborne pollutants, including allergens, smoke, and particulate matter, improving indoor air quality. Their efficiency depends on factors like the type of filter used and proper maintenance. With proper coverage (air flow), an air purifier can effectively keep the ambient particulate levels near zero. At the same time, they may not be able to eliminate all airborne contaminants, such as VOCs and gasses. While air purifiers reduce contaminants, they don't eliminate all pollutants.
3. Is sleeping with an air purifier good?
Sleeping with an air purifier can enhance sleep quality by adding soothing noise plus removing airborne irritants that may disrupt rest. Cleaner air can lead to fewer nighttime allergies and respiratory issues, promoting more restful sleep. Studies have shown that using an air purifier can increase total sleep time and improve overall sleep efficiency.
Sources:
- https://www.epa.gov/indoor-air-quality-iaq/what-hepa-filter
- https://www.lung.org/clean-air/at-home/indoor-air-pollutants
- https://www.epa.gov/indoor-air-quality-iaq/guide-air-cleaners-home
- https://www.consumerreports.org/appliances/air-purifiers/buying-guide/
- https://www.energystar.gov/products/ask-the-experts/how-choose-room-air-cleaner
- https://www.healthline.com/health/allergies/do-air-purifiers-work
- https://scottleeheating.com/the-pros-and-cons-of-owning-an-air-purifier/
- https://www.bannerhealth.com/healthcareblog/advise-me/should-i-get-an-air-purifier-the-pros-and-cons
- https://pubmed.ncbi.nlm.nih.gov/36351665/
