These days and corona virus pandemic, every one wants to have an air purifier for safety. Most people would like to know about the advantages and disadvantages of air purifiers. In this article, we would like to describe a few types of them to you.
Air Purifiers “HEPA“
HEPA filters are the standard for the industry. High – efficiency particulate air (HEPA) filters capture airborne particles from moving air using a dense, random arrangement of fibers. In essence, HEPA filters use the physics of particles moving through air to yank them out of the air flow. They are simple but effective, and HEPA filters are a standard issue now for almost every air purifier on the market. HEPA can filter at least 99.97% of airborne particles down to 0.3 microns.
Disadvantages of HEPA
The hidden factor at work here is leakage. Despite the high efficiency of many HEPA filters, the housing designs of many air purifiers are not airtight, meaning that dirty, unfiltered air passes around the HEPA filter through tiny openings, cracks, and space around the frame of the HEPA filter itself or between the frame and the purifier housing. So even though many air purifiers claim that their HEPA filters remove nearly 100% of particles from the air that passes through them, they’re only telling part of the story. In some cases, the actual efficiency of the whole air purifier design, with leakage considered, is less than 80%. One of the disadvantages of HEPAs is their filters which can be a source of contamination.
filters are great at getting particles out of the air, but despite any claims you may have seen, Hyper HEPA filters do NOT take gases and odors out of the air. Unlike particles, the molecules that comprise gases, odors, and volatile organic compounds ( VOCs ) are not solid. They will float through even the densest Hyper HEPA filters. That’s where activated carbon filters come in. Remember them from early air filtration experiments back in the 1800s.
How do these filters work?
Chunks of carbon material (like charcoal) are exposed to high concentrations of oxygen. Countless pores open on the carbon surface, increasing the carbon surface area enormously. At this point, a pound of activated carbon can have the same surface area as 100 football fields! Several pounds of activated carbon are arranged in a flat “ bed ” and packaged in a proprietary filter design. Air passes through the activated carbon bed, gas, chemical, and VOC molecules are adsorbed into the carbon pores. This is meaning that they chemically bond to the extensive charcoal surface area. Activated carbon adsorption is the go-to method of filtration for gases as well as chemical pollutants from vehicle emissions and combustion processes.
Air Purifiers “Air Ionizers”
The companies purport that Air Ionizers purify the air by sending out negatively charged ions ( anions ) that attract positively charged pollution particles (cations), causing them to leave the air. Many popular air purifiers use ionization technology, also called negative ionization, as a central component of their operation. Research suggests that ionizers can help stop potentially infectious molds and bacteria from spreading in sterile environments especially dental clinics and hospitals.
There isn’t any filter and this is a positive point. But as a negative point, ionizers produce ozone (O3) that can build up to dangerous levels indoors. At even low levels, indoor ozone can irritate your airways, trigger asthma attacks. It can damage your olfactory bulb (the organ that helps your brain process odors).
Air Purifiers “UV Light”
Hospitals often use ultraviolet light to disinfect their equipment. They also prevent the spread of harmful strains of bacteria and viruses. One of the most common UV purification methods is ultraviolet germicidal irradiation ( say that three times fast!), or UVGI. In UVGI, intense UV lights shine on bacteria and viruses, damaging their DNA beyond repair. Bacterial cells and viruses then shut themselves down because they can no longer function. We call it apoptosis, or programmed cell death, which effectively destroys their ability to cause infections.
Bacteria and viruses need to be exposed to UV light for a certain amount of time before they’re rendered harmless. Some strains need to be treated with UV for several hours in direct UV light before they’re destroyed. In addition, some UV air purifiers don’t shine UV light on them long enough to be genuinely useful. And also some bacteria can come back to life and become infectious again even after being disinfected by UV light.
Dis advantages of Ultraviolet Purifiers
UV lights do nothing for pollutant particles. Air treated with UV light can still be full of harmful particulate matter. Many UV air purifiers produce ozone. And what did we say about ozone? That’s right: it’s BAD. UV light can burn your skin and damage your eyes.
Sure, most UV purifiers block the light from shining out of the purifier. But even brief UV exposure can cause permanent skin and eye damage as well as cancer.
Large Room Air Purifiers
HEPA Home Air Purifier Indoor Air Cleaner for Allergies. Powerful five – layer filtration, powerful filter function, efficient operation, low noise, sleep at ease. It can remove the solid particles such as PM2.5, sterilization, pollen, haze, dust, pet dander, particles as fine as 0.3 microns, it can eliminate odor, smoke, and methanol.
Premium Winix True HEPA Air
- True HEPA Filtration captures 99.97% of airborne pollutants, pet dander, and allergens as small as 0.3 microns.
- Also, Plasma Wave Technology safely breaks apart odors, allergens, chemical vapors, and other pollutants at the molecular level.
- Its internal air quality sensor will monitor and adjust the fan speed in real time.
- Users can download the smart app and use smart phone as the IR remote to control this air purifier from distance.
- AHAM verified a room size of 360 sq. ft. It is Also Suitable for medium to large size living spaces.
- WiFi Enabled and Winix Smart compatibility allows users to monitor indoor and outdoor air quality, set timers, schedule, and also acts as a remote.
- Washable Pre – Filter extends the life of your filter by capturing pet hair, pollen, and larger airborne particles.
- Carbon Filter captures pet odors as well as smoke, kitchen, and other household odors. Also extends the life of the True HEPA filter.
- Air Quality Visual Indicator displays real – time air quality in the room with LED lights.
- Auto – Mode utilizes smart sensors to automatically adjust the fan speed optimizing energy usage and constantly meeting the needs of your environment.
Portable Wearable mini Air Purifier
Comes with an active air supply system, breathing fresh air. So dirty air is attracted by the booster fan, filtered and cleaned by the filter, and rushed out along the circular air duct and sent to the nose. A continuous flow of new air completely solves the problem of general masks, and enjoys clean and good air.