4.8 star rating 412 Reviews

EJ120 Air Purifier

Cleans 1,250 sq ft (2 times per hour)


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Super Quiet - no air purifier on the market produces so little noise with such a high air flow making Oransi the The Ultimate Air Cleaning Machine. MERV17 real HEPA filter tested up to 99.99%. Advanced carbon for smoke removal. 

  • Bedroom, Office
  • Living Room
  • Basement
  • Large Living Areas
  • Classroom
Effective For:
  • Dust,
  • Allergies,
  • Pet Dander,
  • Mold,
  • Smoke,
  • Viruses,
  • Bacteria
  • SOLD OUT - For comparable performance (and lower price) we suggest the mod air purifier.
  • Meet EJ, the Tesla of air purifiers - with a super efficient & quiet German designed motor and top notch performance. Energy Star.
  • Chosen by Javits Center in New York during Coronavirus 2020 to clean the air in the field hospital. CNN Best Air Purifier for Large Homes 2019. See our guide for use in a classroom or dentist office.
  • Removes Allergies, Asthma, Dust, Bacteria, Pollen, Mold Spores, Pet Dander, Smoke, Viruses.
  • Real HEPA filter (MERV17) tested to remove 99.99% of airborne particulates at 0.3 microns, 99.8% at 0.10 microns and 99.8% at 0.02 microns (20 nanometers). Virus particles range in size from 0.02 to 0.4 microns and our understanding is COVID is around 0.12 microns where the removal rate with each air pass is 99.85%.
  • What's included: Air purifier with filters installed, User's Manual
  • Find the EJ Replacement Filters.
  • View Technical Specs >

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60-Day Returns*

10 Year Warranty On All Products

10 Year Warranty On All Products

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We want to personalize your experience (check all questions that apply):

Where To Use

Where To Use

Best for: Bedroom, Office, Living Room, Basement

Coverage Area

Coverage Area

Up to 1,250 sq. ft.

Effective For

Effective For

Dust, Pollen, Mold, Pet Dander, Allergies, Bacteria, Smoke Particles, Light Odors only



No air by-pass so all the air is filtered. This is a huge feature and is one reason we have superior air filtration performance.



Electronic display alerts you when it is time to check the air filters.

Reliability and Quality

Reliability and Quality

Air purifier housing, filters, software, motor/fan assembly & software, fan electronics, among others made in USA.

Easy To Use

Easy To Use

Simple controls with electronic 5 speed button to dial in the exact air flow.



Latest high efficiency EC motor is quieter and uses up to 90% less energy

Product Details
Room Coverage Most sized rooms up to 1,250 sq feet
Max Air Flow (cfm) AHAM Verifide CADR (Max Air Flow cfm): pollen-360, dust-333, smoke-331
Air Flow by fan Speed (cfm) 1: 70 2: 100 3: 135 4: 200 5: 330
Power 52W, 120V/60
Main Filter Life 12 months
Main Filter Rating MERV 17 (>99.97%+ at 0.3+ microns). 36 sq ft filter material
Nano Particle Removal 99.8% at 0.1 microns, 99.8% at 0.02 microns (20 nanometers)
Carbon Filter life: 8-12 months
Noise Level Lp(A) by Fan Speed (1-5) 1. N/A, 2. 19, 3. 24, 4. 33, 5. 59 dB(A)
Dimensions 17" x 19" x 10" (W x H x D)
Where Made USA
Pre-filter Weight 1 lbs
Main filter Weight 3 lbs
Total Weight 27 lbs
Total shipping weight 29 lbs
Warranty 10 Years
Certification UL, California Air Resources Board (Model Number: EJ120, EO#: G-16-110)
Technical Specs

Easy To Use

  • Simple, 5 speed digital controls for exact air flow
  • No distracting lights to keep you up at night.
  • No complicated user interface.
  • Easy filter access
  • Don't need a manual to operate the unit.
  • Super quiet.


  • Latest high efficiency EC motor is quieter and uses up to 90% less energy saving since it draws a max of 52 watts and delivers a high 360 pollen CADR air flow.
  • How do you build the ultimate air-cleaning machine? It's simple; you combine the best filters with the best fan and make it in the USA. As allergy and asthma sufferers ourselves, we built the air purifier that we would want to use. Turn your room into a cleanroom!

Best Reliability And Quality

  • Air purifier housing, filters, software, air flow straightener for motor/fan assembly & software, fan electronics, among others made in USA. Only mechanical filtration. No ionizer or anything else that could potentially create ozone.

The Industry-Standard

  • Merv 17 HEPA (99.97%+) performance. Proprietary carbon for advanced gas control. And it's super quiet. Silent on the first two fan speeds and on high much quieter than any other high-end air purifier.

Tested in World Class Labs

  • Merv 17 HEPA (99.97%+) performance. Proprietary carbon for advanced gas control. And it's super quiet. Silent on the first two fan speeds and on high much quieter than any other high-end air purifier..

Energy Savings

  • Average Energy Savings: $168/year
Complete set of filters

1 EJ Air Purifier

User's Manual
Whats included

The Best Filters

Best Filters image 1

HEPA filters were invented in America and through engineering and rigorous testing in America we have improved the HEPA filters. Carbon is widely used for gas removal however does not work well in humid environments or for formaldehyde so we developed a proprietary treatment to solve these problems. To ensure the highest quality and safety we make our air purifiers in America.

We are focused on improving the most important part of your life - protecting the health for you and your family. The EJ air purifier has two filters – a 1” deep pleated activated carbon filter and a 3” deep main HEPA filter. Effective for gases for smoke and gas leaks (methane gas, sulfur gases, and many others).

Note: for heavy smoke or odors the HEPA filter can be removed and replaced with two additional carbon filters.

Formaldehyde Removal: 99.78% (48 hr test)

Sulfur Dioxide Removal: 99.39% (48 hr test)

Nitrogen Dioxide Removal: 99.97% (48 hr test)

Best Filters image 2

The main filter is the same industrial filter that is trusted by hospitals and removes much more than any true HEPA filter.

Filter Sequence

If you remove the filters, the white HEPA filter should be inserted first with the black seal facing inwards (in the picture we show the seal so you can see it although be sure to place the seal facing in). This will ensure it makes a tight seal with the metal frame of the air purifier. The carbon filter is installed next and also acts as a pre-filter. So, when you open the front cover the first filter you should see is the carbon filter.

Pre-filter is 1" deep carbon pleated filter with our proprietary gas filter media that is effective for a wide range of gases and odors. We've improved our carbon filter to have 50% more carbon surface area to better remove all gases.HEPA main filter (99.97%+ at 0.3 microns) is 3" deep

Having more filter media means the main filter will last longer (1+ years) and it creates less air resistance. By not having to work as hard the motor can spin at a slower, quieter rate. These are the same filters used in Hospital Operating Rooms, the Nuclear Industry, Containment units, Laboratories, and Pharmaceuticals.

Filter Sequencee

The Best Motor & Fan

EJ (like our Erik series) has the best, latest German engineered EC motor and fan so it provides higher air flow while being quieter and using much less power. The EC motor is a much-improved technology over the traditional AC motor that nearly every other air purifier uses.

AC motors use technology that was developed in the 1800’s and use more energy, can have an annoying hum, and are not as reliable. They are common because they are very inexpensive to produce.

Placement - we suggest placing the air purifier in the room where you spend most of your time. For most this is a bedroom where the unit stays plugged in and runs 24/7 or whenever you are in the room.

EC Motor Advantages

EC (Electrically Commutated) motors use software and electronics to convert the AC voltage to DC to run the motor. EC is the latest technology innovation whereas AC motors use technology from nearly 200 years ago. With an AC motor from China, chances are that the copper was wound by hand and the ball bearings are of low quality making it unreliable.

  • EC motors are DC so they are more efficient and use up to 90% less power and in the long term can provide significant cost savings.
  • Runs cooler so greater reliability.
  • More compact
  • Has a proven track record in the telecom and computer industry.
  • No motor hum that you get with an AC motor.

Why does the motor/fan start and stop more slowly than an AC motor? EC motors have a soft start programmed into the motor to limit the start-up current the motor draws (there are electronics and software built into the motor). The ramp down after power is removed is only a function of the inertia of the fan and the friction of the bearing system. A high quality bearing system will take longer to slow down and stop since the friction is minimized (alignment is better, lubricant is better, etc.).

Motor Humming 101

The humming noise comes from the fact that it is an AC motor and all the magnetics are changing intensity at the line frequency. When rotating, these forces are aligned so as to rotate the rotor. When the motor is not rotating or rotating at a speed lower than synchronous speed, they tend to make things vibrate back and forth and that makes the humming sound. If you have an AC motor that starts slowly, the humming starts louder and decreases as the rotor and field come into sync.

Room Size

Room size

Up to 1,250 sq ft with 2 air changes per hour. Learn more about air purifier room size and see AHAM Verifide results.

Perfect for large home living areas, offices, healthcare facilities, nursing homes, mold and asbestos abatement and any other small to large square footage space that requires portable air cleaning.

The EJ is super quiet - in fact the quietest air purifier on the market for the given air flow. And on the lowest fan speeds we could not detect any sound in the sound chamber testing.

Where Are the Key Parts Made?

  • Housing - USA
  • Filters - USA
  • Circuit Board - USA
  • Motor/Fan System - USA & Germany

PayPal 6 Months No Interest Financing

To apply for the no interest financing, select Paypal in the checkout. This financing is offered by Paypal and subject to their credit approval.

Here is a summary of the terms: Get No Interest if paid in full in 6 months on purchases of $99 or more when you check out with PayPal Credit. Interest will be charged to your account from the purchase date if the balance is not paid in full within the promotional period. Minimum monthly payments required.

See Paypal Credit for more information.

How do I clean the pre-filter? Clean the pre-filter with the vacuum brush attachment of your vacuum cleaner.

Where is my pre-filter located? As of July 2020 the EJ120s were manufactured with a screen pre-filter attached to the door.

How long does the real HEPA and activated carbon filter last? The HEPA and activated carbon filter lasts 12 month with continuous use.

When the filter light is illuminated, does it mean it’s time to replace it? This light is an indicator to check the real HEPA filter.

How do I clean my activated carbon filter? Clean the activated carbon filter with the brush attachment of your vacuum cleaner or with a damp cloth.

How do I know when to replace the real HEPA filter and activated carbon filter? When the real HEPA filter is completely discolored or black from wall to wall it is time to replace. We recommend replacing the activated carbon filter at the same time as the HEPA.

How do I replace the HEPA and activated carbon filter?

1. Turn off and unplug the purifier.

2. Grab the handle near the top of the cover and pull the cover toward you. The cover will hinge at the bottom.

3. Remove the filters and replace them with new ones.

4. The HEPA filter is inserted first with the side with the Oransi rubber seal facing inward followed by the carbon filter.

5. Close the front cover and lock back into place. If the cover is not fully closed, the unit will not power on.

How do I know which activated carbon filter I need? The EJ Pleated activated carbon filter that comes with the unit at purchase, has 1 pound of carbon in it and is effective for all gasses. The EJ activated carbon filter, which is available as an upgrade, has 3.5 pounds of carbon in it and is more commonly used for strong odor and smoke removal.

How do I turn off my filter indicator light? Press and hold the filter button until the blinking light turns off.

What if my unit will not turn on? The air purifier has a power switch on the back of the air purifier that must be pressed ON. If the air purifier does not run, turn the power switch to OFF and then ON. The motor will not run on fan speed 0. Increase fan speed to 3 or 4 if it does not seem to be running since it can be very quiet on the low speeds.

How can I clean the outside of my purifier? Use a clean, dry, soft cloth to wipe the external surfaces. Never use any chemical or harsh cleaners.

Brands Using Oransi

Oransi air purifiers are used by some of the leading companies, medical centers, government organizations and universities. We are delighted to be able to provide clean air to so many quality organizations.

American red cross
Air purifier

EJ120 Air Purifier

Cleans 1,250 sq ft (2 times per hour)


+ Free Shipping

Reviews & Questions

Still Have Questions?

The mod Air Purifier is a high-performing product that is the result of over 1,000 engineering hours. Naturally, you may have some questions for us. Luckily, we have the answers.