Large PC fan CR Boxes can save a couple hundred dollars per year in electricity and filter replacement cost compared to equivalent large HEPAs
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138 sq ft 2-4 people
Exhalaron - Versatile Personal/TableTop Purifier
Exhalaron - Versatile Personal/TableTop Purifier
Exhalaron - Versatile Personal/TableTop Purifier
The portable Exhalaron provides CDC minimum 5 air changes per hour (ACH) cleaning coverage for small bedrooms and offices, dorms, exam rooms, tents, cabins, and vehicles.
Our favorite way to use this nearly silent, incognito purifier is on a nightstand or meeting table within a meter of mouths to suck up most pathogens before they spread into the whole room! With such quiet, direct source control, Exhalaron punches way above its small room purifier weight class!
Placement is key! Whenever you can place Exhalaron nearby or in between you and other people, it can reduce risk as much as one of our larger units elsewhere in the room.
Exhalaron Ultra Cherry boasts the quietest, strongest 2400 rpm pressure fans we could find: 2 CoolerMaster Mobius for amazing 92 cfm infectious aerosol CADR @ 34 dB sound pressure. Ultra includes a convenient speed control knob on top to dial in a cleaning breeze not too chill! Exhalaron Ultra carries FCC & UL507 electrical safety certification for US and Canada, and is CARB certified to not emit ozone.
The animation below demonstrates how our hand-crafted Exhalaron's strong fans capture or redirect most exhalations (now do you see what inspired its name?) upward, protecting the people talking across the table.
Plug it in if your table is near an outlet. But our favorite way to power it is with a USBC Power Bank tucked inside the crossed bungees we included on the outside. (see photo below) The Ultra Exhalaron can run for 16 hours this way, and you can even power your smart phone while the Exhalaron is running! We provide links to our favorite power bank options later on this page.
Concerned about medical visits or public transportation without two-way masking? Let Exhalaron be your second layer of protection to substantially lower virus, allergens and pollutants in the vicinity wherever you go!
Exhalaron means unprecedented power, silence & versatility for a personal purifier!
Inspired by Cross-Table Exhalation Study
Why double-barrel? U of Colorado, Donghua & Marriot experiments demonstrated that a 98 CADR cfm purifier on a 4-person table will directly capture about 3/4 of exhalations before they cross the table, reducing virus deposited on occupants up to 95%.
We couldn't find any compact HEPAs quite in this CADR range. CleanAirKits created the double-barrel Exhalaron to silently tackle this scenario.
Compatible Power Banks
We don't sell the USBC Lithium battery packs, but have tested all of these and can vouch for them. Battery packs should be USBC PD 20W QC 3.0 rated with male USBC pigtail and < 5.9" tall to fit between filter plates, like these:
VRURC T2046 20000mAh - 16 hours
Charmast C2046S 20000 mAh - 16 hours
Sabani 35000 mAh - 12 hours (not really 35000 mAh??)
Anker GaNPrime 733 Power Bank 10000 mAh - 8 hours, needs male-male USBC
See our Youtube page for PowerBank installation video.
Compatible Cylindrical Filters
Exhalaron's two filter cylinders offer double the typical filtration area to match PC fan pressures and extend filter life. We stock HEPA H10 grade 7x7x6.5" that capture 85% of the trickiest .3um particles and maximize CADR. Higher grade (H13) Taotronics TT-AP006 compatible replacement filters widely available on Amazon (or Amazon UK) will also fit, though performance will vary with each brand's pressure drop.
Washable black speaker mesh attractively shrouds the filters without impeding airflow. Four bungees firmly seal the filters against the fan plates -- just unhook them to change the filters.
Exhalaron hardboard panels do not contain lead, Formaldehyde, or PFAS. However, like cooking, laser cutting can generate trace carcinogens hence:
⚠️WARNING: This product may contain chemicals known to the State of California to cause cancer. www.P65Warnings.ca.gov for more information
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VersionUltra Cherry
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Fans2 CoolerMaster Mobius argb (2400 rpm)
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FiltersTwo HEPA H10 7x7x6.5" flat seal
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Estimated CADR92 cfm (156 m3/hr)
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5ACH Room Cover138 sq ft
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Sound Power / Pressure42 / 34 dB
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Power4.3W
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20Ah PowerBank Life16 hours
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On/Off SwitchPurple variable-speed knob
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ComplianceUL507, CARB, FCC
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Dimensions15x7.25x8.5"
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Weight4 lbs
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VersionExhalaron Ultra Tri
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Fans3 CoolerMaster Mobius
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FiltersTwo HEPA H10 7x7x6.5" flat seal
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Estimated CADR120cfm
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5ACH Room Cover180 sq ft
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Sound Power / Pressure42 / 34 dB
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Power7W
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20Ah PowerBank Life11 hours
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On/Off SwitchPurple speed control knob
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ComplianceUL507, CARB, FCC
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Dimensions22x7.25x8.5"
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Weight4 lbs
- Machine-washable speaker mesh filter shroud
- 16 W USB C Fast Wall Charger, UL-listed
- female USBC PD to 12V DC barrel adapter cable included
Unintuitively Quiet
It's dead simple. CleanAirKits deliver top-end portable HEPA performance and they're QUIET. At that performance level, HEPA are not quiet -- people turn them down or turn them off. And we need them to be on and high-performing to passively remove covid and pollutants.The exceptionally large, unencumbered filtration area provided by dual micro pleated 3M Filtretes, and our diffuse banks of silent pressure fans make this possible. Delivering 200-500 cubic feet per minute of clean air means the boxes filter 1000-2000 faster than an adult human breathes!
Always On Safety
Since a Clean Air Kit is not loud and power hungry like a HEPA, it can always be running. And if it's always running, it's always adding a layer of protection for you and your family from smoke & airborne transmission of viruses like Flu, RSV, and Covid.
This corresponds to the pandemic HVAC best practice of continuously running furnace fan circulation with MERV13 or MERV14 filtration.
March 2022: Study of 10,441 Italian Classrooms with
varying mechanical ventilation up to 6 ACH.
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Quiet on Full
Clean Air Kits produce 5-10x less noise than HEPA purifiers at max capacity.
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One Speed Design
Speed controls defeat the efficacy of most HEPAs -- people turn them down to quiet where air cleaning slows. We have just one speed: silent full blast!
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Unprecedented Energy Efficiency
Decades of competition has driven amazing silence + efficiency in PC fans. Our fan banks use 6-16W -- comparable to a LED bulb and easy to run off batteries!
Products are returnable within 30 days for a full refund less $44 filter hygiene cost and shipping. Exchanges to other models with same filter sizes are free except for shipping, otherwise $44 for new filters.
All products ship from Missouri via UPS according to an average rate per product (until backend supports live rates accurately). Due to high demand and customizations products may take up to two weeks to ship.
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"Standalone HEPAs or Corsi-Rosenthal boxes are a quick way to lower the risk of inhaling SARS-CoV-2 virus. Filtering the virus out of the air reduces the chance of inhaling it---simple logic. The other option is to filter/trap it with a mask before it is released or inhaled."
Kim Prather, PhD
Distinguished Professor, UCSD
Director NSF Center for Aerosol Impacts
on Chemistry of the Environment -
3M tested the Corsi-Rosenthal Box with the same rigor it applies to its Filtrete brand of products and found the C-R Box “performs exceptionally well in its ability to capture unwanted airborne particles, including viruses," says Kelsey Hei, a 3M application engineer.
Fortune: A DIY air purifier that costs
under $100 to make is taking Americas
classrooms by storm -
“A C-R box uses MERV-13 filters, which can only remove 60% to 80% of those particles, (but) the fan on the C-R box is much bigger and can clean more air,” says Joseph Fox, chair of the indoor air quality advisory group with the Ontario Society of Professional Engineers, who works with schools on HVAC issues. “All you care about in the end is the total rate at which the air is cleaned. So, what the C-R box lacks in efficiency, it makes up for in airflow.”
Fortune: A DIY air purifier that costs
under $100 to make is taking Americas
classrooms by storm -
Many exciting innovations have emerged in the last two years alone. Once it is clearly acknowledged the virus is airborne, it becomes a very fixable problem. People will shift from cleaning surfaces to cleaning indoor air where we spend 90% of our time. This has huge positive health ramifications beyond COVID-19 by reducing the spread of all airborne pathogens, pollutants including wildfire smoke, and other asthma-inducing aerosols.
Kim Prather, PhD
Distinguished Professor, UCSD
Director NSF Center for Aerosol Impacts
on Chemistry of the Environment -
To lower inhalation dose of virus-laden respiratory aerosol particles (a major key to suppressing the mortaility and mobidity associated with COVID-19) the three Rs must be advanced from where they are now. Remove, Reduce, Remediate.
Richard Corsi, PhD PE (Texas)
Dean of Engineering, UC Davis -
Appropriate combos of Remove, Reduce, & Remediate are what many of us called layered risk reduction (or layered inhalation dose reduction) back in Spring 2020. Not rocket science. For those who still care about reducing the spread of COVID-19, it all still applies, folks.
Richard Corsi, PhD PE (Texas)
Dean of Engineering, UC Davis -
"I am thrilled to be part of something that is so accessible to people around the world, helping to protect children in school and families in their homes, all the while inspiring children about the power of STEM."
Richard Corsi, PhD PE (Texas)
Dean of Engineering, UC Davis