Multi-Tech 8400 Air Purifier
5 proven air-cleaning stages for virtually every pollutant type, along with strong air flow to maximize efficiency

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Air-cleaning technologies that are tested and recommended by Government Agencies

5 advanced purification technologies to remove nearly all pollutant types

High-Efficiency True HEPA filter to remove dust & allergens

Strong air-flow for high efficiency and large coverage area

Filter-change sensor

Highly-absorbent activated carbon filter for odors & chemicals

Germ-killing UV lamp with lifespan of 3.5 years

Photocatalytic odor/VOC/bacteria filter

Cleanable pre-filter

UV/ions can be turned on and off




Free Shipping


Normally $139

Orders ship within 1 business day

No-Risk, 90-day return policy

3-Year Warranty





Spare HEPA + Carbon Filter
Lasts about 12 months
Price: $29
Free shipping if purchased w/air purifier

Spare UV Lamp
Lasts about 3.5 years
Price: $19
Free shipping if purchased w/air purifier


Product Detail

Five Proven Air-Cleaning Technologies:

True, Cleanable HEPA Filter for the most effective protection against dust & allergens, such as pollen, ragweed, mites and mold spores. HEPA filters are recommended by the Department of Homeland Security and U.S. Centers of Disease Control. HEPA filters are recommended by the Department of Homeland Security and the U.S. Centers of Disease Control. (More Info)

Germicidal UV Lamp to destroy micro-organisms such as germs, viruses, bacteria and fungi (such as mold toxins). Recommended by the U.S. Centers of Disease Control and the Air Institute of Respiratory Education. Also disinfects the micro-organisms that are trapped in the HEPA filter, which is why the CDC recommends using a germicidal UV lamp and HEPA air filter together. (More Info)

Activated Carbon Filter for chemicals, gases odors and cigarette smoke. The most absorbent filter material known to man. Recommended by the Centers of Disease Control, the Dept. of Health and Human Services and the National Institute of Occupational Safety and Health. (More Info)

Photocatalyst Oxidation Filter which effectively reduces chemicals, bacteria and odors. Found to be highly effective in tests commissioned by the U.S. Dept. of Energy. (More Info)

Cleanable Pre-Filter for larger particles, prolonging the life and enhancing the performance of the other filters. Pre-filters are recommended by the Dept. of Homeland Security.


Other Important Benefits:

Low Replacement Costs. Even with 5 purification stages, the Multi-Tech 8400 replacement costs are quite low. The HEPA/Carbon combination filter will usually last about 12 months, and costs only $29 to replace. The long-lasting UV lamp will last about 3-and-a-half years before needing to be replaced, at a cost of only $19. The photocatalytic filter does not require replacement.

Large Coverage Area. Covers up to 400 square feet.

Strong Air Flow (135 Cubic Feet per Minute - cfm). Increases air filtration capacity by maximizing the number of air exchanges every hour.

Extremely Quiet Operation. Despite the power it packs, the fan runs smoothly and quietly. In "Auto" mode, it will automatically adjust to the quieter fan settings when the pollution level is low, producing the lowest amount of sound necessary.

Low Energy Usage, using a mere 55 watts of power (on the high setting).



Multi-Tech 8400 Diagram:




Customer Comments:

Can't believe I lived without this...
 5/5 Stars

By: RuthAnna Autry

I am blown away by this product. My husband and I just moved into an apartment with new carpet, counter tops, and freshly painted - which sounds nice but it was a toxic chamber of VOCs. I couldn't be in the apartment for 20 minutes without getting a headache. I rented an industrial hydroxyl generator, but it was very hard to tell if it was working. I received my Surround Air 8400 and got it set up in the bedroom and within about an hour it was smelling amazing in there.. no fumes or odors, just CLEAN and fresh. I also love that it filters out everything else in the air, including mold. I will be purchasing one of these for every room in the house. I also must add that I did lots of research and contacted some other companies and no one was an helpful or as knowledgeable as Ashley with Surround Air. Great, affordable product and great customer service, you cannot beat that!!




U.S. Government Recommendations

U.S. Government studies and recommendations that validate technologies used in the Multi-Tech 8400 air purifier.

Recommendation for Using HEPA Air Filter and UV Light Together

U.S. Centers of Disease Control Recommends Air Purifier with both HEPA Filter and UV Light.The CDC recommends the use of germicidal ultraviolet (UV) light and HEPA air filters together for the optimal combination of both capturing and destroying microbes. The Multi-Tech 8400 includes both a True HEPA filter and a germicidal UV lamp.

Recommendations for HEPA Air Filter

Recommended by Dept. of Homeland Security.

HEPA air filters were developed by the Atomic Energy Commission during the second World War. They were originally designed to remove radio active dust from their plants. (HEPA Air Filter Research)

Recommendations for Germicidal UV Light (Ultraviolet)

Specified by U.S. Gov't to be used in government buildings to control micro-organisms.

The Centers of Disease Control (CDC) recommends UV lights in homeless shelters to prevent the spread of disease, particularly TB (tuberculosis).

(UV Light Research)

Recommendation for TiO2/Photocatalytic Oxidation

U.S. Department of Energy found that photocatalytic oxidation air purification destroyed VOC chemicals with impressive effectiveness, even at high air flow rates.

(TiO2 / Photocatalytic Studies)

Recommendation for Activated Carbon Filters

In multiple studies commissioned by the U.S. Dept. of Energy, found to be very effective at removing organic chemicals. Recommended by the Centers of Disease Control, Dept. of Health and Human Services, and the National Institute for Occupational Safety and Health.

Originally used in World War II to protect U.S. soldiers from chemical warfare agents.

(Activated Carbon Filter Facts and Studies)

Recommendation for Pre-Filters

The Dept. of Homeland Security recommends using a pre-filter along with a HEPA filter, to preserve the life of the HEPA filter.


Pollutant Types Removed by the Multi-Tech 8400 Air Purifier

 Pollutant Types Removed:

Type Rating Type Rating


















Just some of the many types of pollutants removed by the Multi-Tech 8400:

Dust/Dust Mites. The Hepa air filter in the Multi-Tech 8400 is highly effective at capturing solid particles such as dust and dust mites. UV light can be deadly for dust mites.


Bacteria. Much of the bacteria floating around in the air can be effectively captured by the Hepa air filter, while the germicidal UV lamp serves to disinfect the bacteria trapped by the Hepa filter. The Multi-Tech 8400 also includes a photocatalytic oxidation filter, a technology which has been proven to be effective at destroying bacteria.

Pollen and Other Allergens. Hepa air filters are the most commonly recommended filter for allergens, and are generally considered the most effective type against them.


Mold/Fungi. Mold spores are effectively captured by Hepa air filters. UV light is deadly against the microbiological toxins associated with mold. The activated carbon filtration and photocatalytic oxidation technologies used by the Multi-Tech 8400 are effective against mildew smells often emitted by household mold.

Cigarette Smoke. The carbon air filter in the Multi-Tech 8400 absorbs smoke particles and the toxic chemicals associated with cigarette smoke. With the help of the photocatalytic oxidation filter, it also helps to reduce or eliminate odors from cigarette smoke.

Chemicals and VOCs (Volatile Organic Compounds). The carbon air filter is very effective at absorbing chemicals and gases. Also, photocatalytic oxidation has been proven to be effective at breaking up chemical compounds.

Germs/Viruses. The UV light is deadly against micro-organisms such as germs and viruses, and highly effective at destroying them as they pass by the UV lamp.


Odors. Both the photocatalytic oxidation filter and activated carbon air filter are effective at eliminating or reducing strong odors.



Multi-Tech 8400 Specifications:

  • Voltage: 100-120 VAC, 60Hz
  • Power Consumption: 55 Watts (Highest Fan Setting)
  • UV Wavelength: 254 nm (germicidal wavelength)
  • UV Lamp Life: 3.5 years if run continuously (or more if not run continuously)
  • Sound Level (dB): Low (30), Medium (40), High (50)
  • Air Volume: 135cfm (Highest Fan Setting)
  • HEPA Filter Removal Rate: 99.97% at 0.3 microns
  • Dimensions (in): 16.1 x 12.75 x 6.4
  • Weight (lbs): 9.25
  • Applicable Area: Up to 400 sq. ft.