6 Best HEPA Air Purifier to Remove Dust, Odors, and Microbes in 2020

    First and foremost, a HEPA air purifier helps purify the air in your room and complement other ways to keep your room clean. Some of the most popular ones you can used in the home are compared below.

    Table of Content

    HEPA Air Purifiers Reviewed
    Review of Best HEPA Air Purifiers
    Buyer's Guide for HEPA Air Purifiers
    Frequently Asked Questions (FAQ)

    HEPA Air Purifiers Reviewed

    1. Germ Guardian
    2. Coway AP-1512HH
    3. Winix 5500-2
    4. LEVOIT Air Purifier
    5. Medify MA-40
    6. Hathaspace HSP001

    Review of Best HEPA Air Purifiers

    Editor’s Choice of Best HEPA Air Purifier

    6. Hathaspace HSP001

    Comparison of Best HEPA Air Purifiers

    A table comparing these HEPA air purifiers, reviewed below, is available to help you make a decision.

    1. Germ Guardian

    Germ Guardian True HEPA Filter Air Purifier - UV-C Sanitizer - AC4825

    HEPA Air Purifier

    Filtration Features

    First, the 3-stage filtration captures and removes up to 99.97% of harmful germs, dust, pollen, pet dander, mold spores, and other allergens as small as 0.3 microns. And, the three stages are:

    First, in stage 1, the pre filter traps dust, pet hair, and other large particles, thereby extending the life of the HEPA filter.

    Second, in stage 2, there is a true HEPA air filter.

    Third, in stage 3, there is an ptional UV-C light works with titanium dioxide to reduce volatile organic compounds.

    Key Features

    1. 1
      First, the Germ Guardian HEPA air purifier filters air in a 167 square foot room up to four times per hour while operating at its highest speed.
    2. 2
      Second, it has three speed settings.
    3. 3
      Third, at its ultra-quiet lowest speed setting, it can be used to create gentle white noise to get a quiet, restful sleep.
    4. 4
      Also, the Germ Guardian has been verified by the Association of Home Appliance Manufacturers or AHAM for its ability to clean tobacco smoke, dust, and pollen from rooms.
    5. 5
      Finally, it has the following Clean Air Delivery Rate or CADR ratings (in cubic feet per minute):

    Dust – CADR 118,
    Pollen – CADR 125,
    Smoke – CADR 108.

    Other Features

    1. 1
      First, it is 9” wide, 5.5” deep and 22” high.
    2. 2
      Second, it weighs 7 pounds.
    3. 3
      Third, the Germ Guardian is Energy star certified and California Air Resources Board or CARB compliant.
    4. 4
      Also, it can be plugged into a 120 volts AC outlet.
    5. 5
      Finally, it comes with a 3-year limited warranty.

    Eliminates or Reduces

    Allergies
    Dust
    Germs
    Mold spores
    Odors. Activated charcoal filter helps to reduce unwanted odors from pets, smoke, cooking fumes.
    Other allergens as small as 0.3 microns
    Pet Dander
    Pollen
    Smoke including tobacco smoke
    UV-C light helps kill airborne viruses such as influenza, staph, rhinovirus

    Uses

    Most of all, this air purifier can be used in the home, office, bedrooms, or rooms up to 167 square feet.

    PROS

    1. 1
      First, it has a pre-filter to remove larger particles
    2. 2
      Second, the Guardian is a potentially a 3-stage filtration system with the optional UV-C light that works with titanium dioxide to reduce volatile organic compounds and kill airborne viruses such as influenza, staph, rhinovirus.
    3. 3
      Third, it filters a 168 square feet room at a rate of four times per hour.
    4. 4
      Next, it has a Clean Air Delivery Rate or CADR rating of 118 for dust, 125 for pollen, and 108 for smoke.
    5. 5
      Finally, the Germ Guardian comes with a 3-year limited warranty.

    CONS

    1. 1
      However, the Germ Guardian becomes a 2-stage filter without the optional UV-C light capability.

    2. Coway AP-1512HH

    Coway AP-1512HH Mighty Air Purifier

    HEPA AIr Purifier

    Filtration Features

    First, the strict 4-stage filtration captures and removes up to 99.97% of particles as small as 0.3 microns, including pollen, pollutants, and other allergens. Also, the Coway removes and reduces volatile organic compounds and odors.

    First, the pre-filter is a washable micro mesh that captures large particles like hair, fur, and dust.

    Second, the deodorization filter uses advanced activated carbon to eliminate smaller particles, bad odors, and harmful gases. Meanwhile, other examples include Volatile Organic Compounds or VOCs, cigarette fumes, harmful gases, pet odor, food smells, and other odors. By the way, activated carbon filters need to be replaced every 6 months.

    Next, true HEPA filters trap fine dust, dust particles, mold, cigarette fumes, airborne allergens, and contaminants, as small as 0.3 microns in size, 99.97% of the time. Meanwhile, these HEPA filters need to be replaced every 12 months.

    Finally, by using negative ions, the vital ionizer boosts cleaning power and freshens air. In fact, the bipolar ionizer generates electrochemical reaction that reduces particles in the air.

    Key Features

    1. 1
      First, the three fan speeds can be set either manually or automatically. In fact, when the Conway is in auto mode it automatically selects speed settings 1 to 3 based on the level of indoor air quality (clean, medium polluted, highly polluted). Also, when no pollution is detected for 30 minutes the fan will automatically stop and go into Eco mode to save energy.
    2. 2
      Second, the timer feature lets you run the machine for 1, 4 or 8 hours before it automatically powers off.
    3. 3
      Also, the Conway has a filter replacement indicator that checks both the pre-filter and the HEPA filter to let you know when to wash or replace the filter.
    4. 4
      In addition, it has the following Clean Air Delivery Rate or CADR ratings (in cubic feet per minute):

    Dust – CADR 246,
    Pollen – CADR 240,
    Smoke – CADR 233.

    1. 6
      Finally, the brightly colored LED display lets you know the cleanliness or dirtiness of air every minute of the day. In fact, these indicators are:

    Clean,
    Medium polluted, and
    Highly polluted.

    Other Features

    1. 1
      First, it is 16.8” wide, 18.3” high, and 9.6” deep.
    2. 2
      Second, it weighs 12.35 pounds.
    3. 3
      Third, it runs quietly with noise level ranging from 24.4 to 53.8 dB.
    4. 4
      Also, it consumes 4.9 to 77.8 watts of power.
    5. 5
      Finally, it comes with a 1-year limited manufacturer’s warranty on internal parts, and 3-year warranty for motor and electronic parts.

    Eliminates or Reduces

    Dust
    Fur
    Hair
    Odors.
    Other allergens as small as 0.3 microns
    Pollen
    Pollutants
    Smoke
    Volatile organic compounds

    Uses

    Most of all, this air purifier can be used in a living room, apartment, middle sized rooms, or rooms up to 361 square feet.

    PROS

    1. 1
      First, it comes with a 4-stage filtration system.
    2. 2
      Second, the pre-filter can be washed.
    3. 3
      Third, the deodorization carbon filter helps remove odor.
    4. 4
      Furthermore, the Ionizer boost cleaning and freshens air.
    5. 5
      Also, the filter replacement indicator checks both pre-filter and HEPA filter to let you know when to wash or replace the filter.
    6. 6
      In addition, when in auto mode, the purifier monitors air quality to control fan.
    7. 7
      Next, the timer lets you manually run the fan for 1, 4, or 8 hours.
    8. 8
      Moreover, the LED display lets you know cleanliness or dirtiness of air every minute of the day.
    9. 9
      Finally, the Conway comes with a 1-year limited manufacturer’s warranty on internal parts, and 3-year warranty for motor and electronic parts.

    3. Winix 5500-2

    Winix 5500-2 Air Purifier with True HEPA, PlasmaWave and Odor Reducing Washable AOC Carbon Filter

    Air purification machine

    Filtration Features

    First, the 3-stage filtration captures and removes up to 99.97% of particles as small as 0.3 microns. And, the three stages are:

    First, a washable, Advanced Odor Control or AOC carbon filter, made from activated carbon granules that reduces Volatile Organic Compounds or VOCs and household odors from cooking, pets, and smoke. Furthermore, this carbon filter is designed to catch airborne particles found indoors. As a result, the filter helps prolong the life of the True HEPA filter.

    Next, the True HEPA filter captures airborne allergens, pollutants, dust, dust mites, pet dander, microbes, smoke particles, pollen, mold spores and other allergens, as small as 0.3 microns in size, 99.97% of the time.

    Finally, PlasmaWave works at a molecular level and acts as a permanent filter to safely break down odors, allergens, chemical vapors, and other indoor pollutants without emitting any harmful ozone or other byproducts.

    Key Features

    1. 1
      First, the Winix HEPA air purifier filters air in a 360 square foot room five times in an hour.
    2. 2
      Second, Auto Mode uses smart sensors, that continuously monitor the air, to adjust fan speed so that the air is quickly filtered.
    3. 3
      Third, in sleep mode, the Winix purifier measures the amount of ambient light in the room to adjust the fan speed and dim indicator lights to provide a quiet, clean air that does not disturb sleep.
    4. 4
      Next, the smart sensor LEDs display air quality on a scale of good to poor, with blue being good, red being poor, and amber being in-between.
    5. 5
      Meanwhile, the four fan speeds of low, medium, high, and turbo can be manually selected. For example, the low or medium speed is used for silent cleaning while high or Turbo speed is used for maximum air flow and cleaning power.
    6. 6
      By the way, the filter replacement indicator LED illuminates when filter need to be replaced.
    7. 7
      Furthermore, the Clean Air Delivery Rate or CADR is rated at 360 square feet, which corresponds to a medium or large room such as children’s bedroom, family room, or kitchen.
    8. 8
      Finally, the remote control lets you control the Winix 5500-2 from a couch, chair, or anywhere else in the vicinity.

    Other Features

    1. 1
      First, it is 15” wide, 23.6” high, and 8.2” deep.
    2. 2
      Second, it weighs 15.4 pounds.
    3. 3
      Third, the Winix 5500-2 is CUL listed, Association of Home Appliance Manufacturers or AHAM Clean Air Delivery Rate or Clean Air Delivery Rate or CADR certified, California Air Resources Board or CARB certified, and Energy Star certified.
    4. 4
      Meanwhile, the Winix 5500-2 consumes 70 watts of electricity.
    5. 5
      Finally, the HEPA air purifier comes with a 1-year limited manufacturer’s warranty.

    Eliminates or Reduces

    Allergens as small as 0.3 microns
    Bacteria
    Chemical vapors
    Dust
    Dust mites
    Hair
    Microbes
    Mold spores
    Odors.
    Pet dander
    Pollen
    Pollutants
    Smoke and smoke particles
    Volatile organic compounds

    Use

    Most of all, this air purifier can be used in a living room, kitchen, office, or rooms up to 360 square feet.

    PROS

    1. 1
      First, the Winix uses 3-stage filtration.
    2. 2
      Second, it uses a washable, Advanced Odor Control or AOC carbon filter.
    3. 3
      Third, it uses PlasmaWave to safely break down odors, allergens, chemical vapors, and other indoor pollutants without emitting any harmful ozone.
    4. 4
      Next, the Winix can filter a 360 square foot room five times in one hour.
    5. 5
      Also, when in Auto mode, the Winix monitors air quality to control fan speed.
    6. 6
      In addition, its LEDs display air quality on a scale of good to poor.
    7. 7
      On the other hand, you can manually select any of the four fan speeds.
    8. 8
      Meanwhile, the filter replacement indicator LED illuminates when the filter needs to be replaced.
    9. 9
      Also, it comes with a Remote control so you can operate the air purifier while on a couch, chair, or bed.
    10. 10
      Finally, it comes with a 1-year warranty.

    4. LEVOIT Air Purifier

    LEVOIT LV-PUR131 - H13 True HEPA Filter - Air Cleaners

    Clean air machine

    Filtration Features

    First, the 3-stage filtration captures and removes up to 99.97% of harmful allergens, germs, bacteria, dust, odors, pollen, pet dander, mold spores, and other allergens as small as 0.3 microns from the air.

    First, a pre-filter captures large particles such as hair, pet fur, and lint.

    Next, H13 True HEPA filter traps fine particles such as dust mites, airborne bacteria, and pollen. By the way, LEVOIT filters last up to 8 months.

    Finally, the high-efficiency huge honeycomb activated carbon filter removes various household odors such as cooking smells and pet odors.

    Key Features

    1. 1
      First, the Levoit filters air in a 360 square feet room 4.5 times in one hour.
    2. 2
      Second, at the highest of the fan’s three speeds, the Levoit cleans a 900 square feet room in one hour, a 500 square feet room in 33 minutes, and a 360 square feet room in 24 minutes. 
    3. 3
      Third, when smart auto mode is activated, a cutting-edge intelligent smart sensor automatically adjusts between the three fan speeds based on the quality of the surrounding air.
    4. 4
      Also, in sleep mode, the LV-PUR131 operates at 27 dB so that you get undisturbed sleep. Also, you can turn off the LED display for a darker sleeping environment.
    5. 5
      In addition, the centrifugal fan design and semi-spiral air ducts increase intake volume, allowing air purifier to filter air faster and more efficiently.
    6. 6
      Next, the Check Filter Indicator tells you when to check on your filter and see if it needs to be replaced.
    7. 7
      Furthermore, the Clean Air Delivery Rate or CADR rating is 230 cubic feet per minute.
    8. 8
      Finally, the Levoit air purifier is 100% ozone-free, never using the UV-C light and anion purification methods that cause harm to children and people with asthma.

    Other Features

    1. 1
      First, it is 14.5” wide, 18.5” high, and 7.2” deep.
    2. 2
      Second, it weighs 11.24 pounds.
    3. 3
      Third, it is Energy Star certified.
    4. 4
      Also, it consumes 40 watts of electricity.
    5. 5
      In addition, it can be plugged into a 120 volts AC outlet.
    6. 6
      Next is has Wi-Fi connectivity.
    7. 7
      Consequently, you can use Alexa to control Purifier.
    8. 8
      Finally, this HEPA air purifier comes with a 1-year limited warranty.

    Eliminates or Reduces

    Allergies
    Allergens
    Other allergens as small as 0.3 microns
    Bacteria
    Dust
    Germs
    Hair
    Mold spores
    Odors
    Pet odors and dander
    Pollen
    Smoke
    Wildfire smoke

    Use

    Most of all, this air purifier can be used in a bedroom, extra-large room, living room, kitchen, or in the office.

    Beneficiaries

    Air purifier helps those with:

    Allergies
    Asthma
    Stuffy nose
    Pet owners
    Children
    Elderly
    Those needing relief from seasonal allergies
    People sensitive to air quality

    PROS

    1. 1
      First, it comes with a 3-stage filtration system.
    2. 2
      Second, it has a pre-filter to remove large particles.
    3. 3
      Third, is uses a high-efficiency huge honeycomb activated carbon filter to remove odors.
    4. 4
      Also, it can filter a 360 square foot room 4.5 times in one hour.
    5. 5
      Next, when in auto mode the Levoit monitors air quality to control fan speed.
    6. 6
      Meanwhile, the LV-PUR131 operates at 27 dB in sleep mode so that you get undisturbed sleep. Also, you can turn off the LED display for a darker sleeping environment.
    7. 7
      Moreover, the Check Filter Indicator reminds you when to check on your filter and see if it needs to be replaced.
    8. 8
      Most of all, this HEPA air purifier is 100% ozone-free, never using the UV-C light and anion purification methods that cause harm to children and people with asthma.
    9. 9
      Furthermore, the Wi-Fi connectivity allows you to use Alexa to control the purifier.
    10. 10
      Finally, it comes with a 1-year warranty.

    5. Medify MA-40

    Medify Air Purifier - 2.0 Medical Grade Filtration

    Clean air gadget

    Filtration Features

    First, the 3-stage filtration system come in a single cartridge that fits within a foam edge that provides an air-tight seal. Moreover, the single cartridge makes replacement easy. Now, the four levels of filtration, within the cartridge, catch and remove allergens, pet dander.

    First, the pre-filter removes hair, fibers, and large particles like dander.

    Second, the medical grade H13 HEPA filter, higher rated than True HEPA, removes 99.97 percent of particles as small as 0.1 microns. In fact, this filter traps fine particles such as dust mites, pollen, and others you cannot see. Meanwhile, the filter has a lifespan of 2,500 hours. And, it removes 99.9% of particles as small as 0.1 microns.

    Third, a substantial carbon filter with carbon pellets removes toxic odors, smoke, and formaldehyde.

    Finally, the optional anion generator produces negative ions to charge particles and trap them inside the unit to give you a fresh feel. By the way, this filter can be turned on or off as needed. 

    Key Features

    1. 1
      First, at the highest of the fan’s four speeds, the MA-40 cleans air in a 1,600 square feet room in one hour, a 840 square feet room in 30 minutes, and a 420 square feet room in 15 minutes.
    2. 2
      Second, it has an air quality sensor.
    3. 3
      Also, to make it quieter for sleeping, the speed setting is set to 1 and the ionizer is automatically turn off. Meanwhile, speeds 2 and 3 can be turned on or off as needed.
    4. 4
      Furthermore, the Clean Air Delivery Rate or CADR for this purifier is rated at 330 square feet for large coverage areas.
    5. 5
      Finally, the easy to clean, tempered glass touch panel is used to control purifier.

    Other Features

    1. 1
      First, it is 9.9” wide, 22” high, and 10.9” deep.
    2. 2
      Second, the Medify MA-40 weighs 15.5 pounds.
    3. 3
      Third, it can be easily moved with its handle.
    4. 4
      Also, the Medify MA-40 is California Air Resources Board or CARB, ETL, and Energy Star certified.
    5. 5
      In addition, it has a child lock.
    6. 6
      Furthermore, there is an 8-hour timer.
    7. 7
      Next, it consumes 68 watts of electricity.
    8. 8
      Also, it plugs into a 110/120 volts AC power outlet.
    9. 9
      Finally, the Medify comes with a lifetime warranty, lifetime coverage on all parts and service for registered product as long as the filters are changed every 2,500 hours of use or 6 months with genuine MEDIFY air filters.

    Eliminates or Reduces

    Anthrax
    Asbestos
    Bacteria
    Carbon dust
    Dust mites
    Insecticide
    Lead dust
    Mold
    Paint pigment
    Particles as small as 0.1 micron
    Pet dander
    Pollen
    Smoke – Common smoke, Tobacco smoke
    Virus carriers

    Use

    Most of all, this air purifier can be used in a living room, kitchen, bedroom, or in the office.

    PROS

    1. 1
      First, the 3-stage filtration come in a single cartridge that fits within an air-tight seal.
    2. 2
      Second, the True HEPA air purifier, removes 99.97 percent of particles as small as 0.1 microns.
    3. 3
      Third, the carbon filter with carbon pellets removes toxic odors.
    4. 4
      Furthermore, the optional anion generator produces negative ions to charge particles and trap them inside the unit to give you a fresh feel. Moreover, this filter can be turned on or off as needed.
    5. 5
      Finally, it comes with a lifetime warranty.

    6. Hathaspace HSP001

    Hathaspace Smart True HEPA Air Purifier - 5-in-1 Large Room Air Cleaner & Deodorizer - HSP001

    fresh pure air machine

    Filtration Features

    First, the 5-in-1 purification system has the following features.

    First, a Nano cold catalyst filter captures large dust particles like dust, pet dander, pollen, mold, and toxic household chemicals like formaldehyde, ammonia, and benzene.

    Second, a cellular-activated carbon filter absorbs smoke, gases, Volatile Organic Compounds (VOCs) found in household products, odors from cooking, cigarettes, and pets.

    Third, the anti-bacterial filter captures bacteria and germs.

    Next, the True HEPA filter removes 99.97% of allergens and pollutants such as dust mites, pollen, pet dander, and mold spores as small as 0.3 microns. 

    Lastly, the California Air Resources Board or CARB approved ozone safe Ionizer, which can be turned on and separately controlled, releases negatively charged ions (known as anions) that neutralize and eliminate odors, smoke, dust, and pet hair. By the way, this filter can be independently turned on or off.

    Key Features

    1. 1
      First, this purifier replaces air two times an hour in a 350 square foot room or once an hour in a 700 square foot room.
    2. 2
      Second, in auto mode, the automatic smart air quality sensor system measures the air quality and adjusts the fan’s speed in real-time. Furthermore, the display on the unit will continuously diagnose your air and show the air quality levels (green, yellow, red), so you always know what you are breathing.
    3. 3
      Third, you can set your air purifier to a whisper quiet sleep mode. Consequently, it will operate at this very quiet level of 20 dB. Also, the lights on the purifier are turned off.
    4. 4
      Furthermore, the Clean Air Delivery Rate or CADR is 160 cubic meters per hour.
    5. 5
      Finally, you can control your air purifier with a remote controller. As a result, you can operate the air purifier from your couch, chair, or bed.

    Other Features

    1. 1
      First, it is 13.5” wide, 19.5” high, and 7” deep.
    2. 2
      Second, it weighs 12 pounds.
    3. 3
      Third, it is UL certified, and meets California Air Resources Board or CARB ozone requirements.
    4. 4
      Meanwhile, it consumes 40 watts of electricity.
    5. 5
      Also, it can be plugged into a 110-120 volts AC power outlet.
    6. 6
      Finally, it comes with a 2-year warranty.

    Eliminates or Reduces

    Airborne pollutants
    Allergens
    Bacteria
    Dust
    Dust mites
    Gases
    Germs
    Hair
    Mold
    Mold spores
    Odors such as those from litter boxes, cigarettes, and old homes
    Pet odors, dander, and hair
    Pollen
    Pollutants as small as 0.3 microns
    Smoke
    Toxic chemicals
    Volatile organic compounds (VOCs)

    Beneficiaries

    Air purifier helps those with:

    Allergies
    Allergy symptoms like sneezing, coughing, and irritated eyes.
    Asthma
    Pets
    Smokers

    PROS

    1. 1
      First, this HEPA air purifier uses a 5-stage filtration system.
    2. 2
      Second, the Nano cold catalyst filter captures large dust particles and toxic household chemicals like formaldehyde, ammonia, and benzene.
    3. 3
      Third, the cellular-activated carbon filter absorbs smoke, gases, Volatile Organic Compounds (VOCs) found in household products.
    4. 4
      Fourth, the anti-bacterial filter captures bacteria and germs.
    5. 5
      Next, the True HEPA filter removes 99.97% of allergens and mold spores as small as 0.3 microns.
    6. 6
      Also, the California Air Resources Board or CARB approved ozone safe Ionizer neutralize and eliminate odors, smoke, dust, and pet hair.
    7. 7
      In addition, the purifier display air quality levels (green, yellow, red).
    8. 8
      Most of all, this purifier can be managed from a remote controller.
    9. 9
      Finally, it comes with a 2-year warranty.

    Buyer's Guide for HEPA Air Purifiers

    Auto Mode

    First of all, the primary function of the air purifier is to clean the air in a room. For the purification to occur, air in the room has to go through filters that capture pollutants in the air. Meanwhile, fans force the air through purifiers. Now, there are two ways these fans can work. The first is by manually turning the fans on or off. While the alternate way is for the air purifier to monitor pollutant level in the air and automatically turn the fans on or off depending on the pollutant level. In fact, this auto mode is a far more convenient and energy efficient way to operate the air purifier.

    Does Size of the Room Matter?

    In fact, the size of the room does matter. By the way, each HEPA air purifier specifies the optimum square footage of the room the air purifier is designed for. For example, a small room is usually around 200 to 300 square feet. Meanwhile, master bedrooms or living rooms can be anywhere from 400 to 800 square feet. So, one of the first things to do is measure the square footage of the room where you want purified air.

    Filters

    Now, filters help remove pollutants from the air. So, the more the better. But, not always. For example, if you don't have pets in the home, there is no need to have a filter that helps remove pet dander, hair, and odor.

    First, a pre filter traps dust, pet hair, and other large particles.

    Second, a HEPA filter that removes 99.97 percent of particles as small as 0.3 microns or even smaller.

    Third, a carbon filter, made from activated carbon granules helps reduce Volatile Organic Compounds or VOCs, and household odors from cooking, pets, and smoke.

    Fourth, an Ionizer, which releases negatively charged ions (known as anions) that can, for example, neutralize or eliminate odors, smoke.

    Fifth, an anion generator that produces negative ions to charge particles and trap them inside the unit for that feeling of freshness.

    Lastly, an anti-bacterial filter to capture bacteria and germs.

    Warranty

    A warranty helps with peace of mind once you’ve invested.

    Frequently Asked Questions (FAQ)

    What are HEPA Filters?

    High Efficiency Particulate Air or HEPA filters are the most basic type of air filters. These filters filter air as it flows through the machine by trapping particles too big to go through the filters. Now, True HEPA filters are certified to capture 99.97% of particles larger than 0.3 microns. By the way, mold spores can range from 1 to 100 microns.

    Because HEPA filters are the most basic type of air filters, they are also the most reliable. However, you have to ensure that the filter remains clean. And, one of the ways to do this is to replace the filter at least once a year if not more often.

    What is a Carbon Filter?

    First, a carbon filter is made of activated carbon, also called activated charcoal. In fact, carbon air filters help trap odors through a process called adsorption. In this process, molecules attach to the outside of a surface, rather than being soaked into it. So, the more porous the activated carbon, the better, as this will increase the amount of surface area available for contaminants to latch onto when air passes through the filter. Therefore, carbon filters remove odors caused by pets, cooking and mildew, Consequently, these filters are great in homes with smokers or pets.

    What is CADR?

    First and foremost, CADR or Clean Air Delivery Rate is measured in cubic feet per minute or cfm. Now, CADR was developed to measure the performance of residential air purifiers. Also, the Association of Home Appliance Manufacturers (AHAM) oversees the CADR rating program.

    Most of all, the CADR rating reflects the volume of air in cubic feet per minute that is cleaned of particles of certain sizes. So, to measure the effectiveness in removing particles of different sizes, three types of particles are tested: smoke, pollen and dust. By the way, these represent small, medium and large sized particles respectively. Therefore, each particle  is measured and assigned it’s own CADR score.

    So what do you get out of a CADR? Well, the CADR rating gives you a way to compare air purifiers that consider both air flow and filter efficiency. In fact, the CADR is basically a reflection of the air flow (in cubic feet per minute or CFM) times the efficiency of the air filter. Therefore, if an air filter has  a capacity  of 200 cfm and 100% efficient the CADR would be 200. On the other hand, if the air filter has a capacity of 200 cfm but only 50% efficient the CADR would be 100.

    What is UV-C Light?

    Ultraviolet Germicidal Irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (ultraviolet C or UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions.

    By the way, human overexposure causes temporary skin redness and harsh eye irritation, but no permanent damage, skin cancer, or cataracts. 

    What are Volatile Organic Compounds?

    Volatile Organic Compounds or VOCs are emitted by a wide array of products. For example paints and lacquers, paint strippers, cleaning supplies, pesticides, building materials and furnishings, office equipment such as copiers and printers, correction fluids and carbon less copy paper, graphics and craft materials including glues and adhesives, permanent markers, and photographic solutions.

    Also, organic chemicals are widely used as ingredients in household products. For example, paints, varnishes, and wax all contain organic solvents, as do many cleaning, disinfecting, cosmetic, degreasing, and hobby products. In addition, fuels are made up of organic chemicals. Now, all these products can release organic compounds while you are using them, and, to some degree, when they are stored.

    What is CARB Compliance?

    All portable indoor air cleaning devices sold in California must be certified by the California Air Resources Board (CARB). To be certified, air cleaners must be tested for electrical safety and ozone emissions, and meet an ozone emission concentration limit of 0.050 parts per million. In fact, there is an official list of air cleaners that are CARB compliant.

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