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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441-602 sq ft 7-10 people
Luggables
Luggables
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Luggables
Luggable XL Ultra is the quietest, lightest, most compact and cost-effective way to protect 10 people to 40cfm/per level in medium-large rooms like classrooms and open kitchen/family rooms.
For the XL Ultra, Coolermaster provided us a special Black Edition of their industry-leading Mobius 120P 2400rpm fan. Seven of these Mobius 120P are thus able to replace and outperform the 9 SickleFlow of our former XXL 25x25" model with same noise level! Plus the Mobius loop-dynamic bearing is rated at 210,000 hours or 22 years MTTF (mean-time-to-failure) vs 18 years MTTF for the SickleFlow.
Intertek tested our XL Ultra to achieve an unprecedented 24 Smoke CADR per Watt, more than double the energy efficiency of all large HEPA purifiers in the EnergyStar database!
XL Ultra is well-oriented: the main 5-fan bank can blows up and the 2-fan bank sideways, with one side against a wall. Finally, it really is luggable -- weighing only 8 lbs! Luggable XL Ultra comes with a side handle installed.
The optional hex mesh filter guard protects from prying little hands and claws. They also strengthen the box considerably. We recommend them if the box will be moved around a lot or placed in high traffic areas like classrooms or restaurants.
Variable speed control can be had with a 3-12V DC 3A power supply like this, sold separately.
Unassembled Kit has 30 minute assembly time and assembles the same as factory procedure.
Considering shipping prices, unassembled STEM Kit w/o filters save ~$40 when 3M Filtrete MPR1900/MPR2200 20x25 are purchased separately from Lowes. Outside the US, try Digi-Key
Luggable XL Ultra hardboard panels do not contain lead, Formaldehyde, or PFAS. However, like cooking, lasercutting 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
Luggable XL Ultra is the quietest, lightest, most compact and cost-effective way to protect 10 people to 40cfm/per level in medium-large rooms like classrooms and open kitchen/family rooms.
For the XL Ultra, Coolermaster provided us a special Black Edition of their industry-leading Mobius 120P 2400rpm fan. Seven of these Mobius 120P are thus able to replace and outperform the 9 SickleFlow of our former XXL 25x25" model with same noise level! Plus the Mobius loop-dynamic bearing is rated at 210,000 hours or 22 years MTTF (mean-time-to-failure) vs 18 years MTTF for the SickleFlow.
Intertek tested our XL Ultra to achieve an unprecedented 24 Smoke CADR per Watt, more than double the energy efficiency of all large HEPA purifiers in the EnergyStar database!
XL Ultra is well-oriented: the main 5-fan bank can blows up and the 2-fan bank sideways, with one side against a wall. Finally, it really is luggable -- weighing only 8 lbs! Luggable XL Ultra comes with a side handle installed.
The optional hex mesh filter guard protects from prying little hands and claws. They also strengthen the box considerably. We recommend them if the box will be moved around a lot or placed in high traffic areas like classrooms or restaurants.
Variable speed control can be had with a 3-12V DC 3A power supply like this, sold separately.
Kit has 30 minute assembly time and assembles the same as factory procedure.
Considering shipping prices, unassembled STEM Kit w/o filters save ~$40 when 3M Filtrete MPR1900/MPR2200 20x25 are purchased separately from Lowes. Outside the US, try Digi-Key
Luggable XL Ultra hardboard panels do not contain lead, Formaldehyde, or PFAS. However, like cooking, lasercutting 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
Luggable XL Ultra is the quietest, lightest, most compact and cost-effective way to protect 10 people to 40cfm/per level in medium-large rooms like classrooms and open kitchen/family rooms.
For the XL Ultra, Coolermaster provided us a special Black Edition of their industry-leading Mobius 120P 2400rpm fan. Seven of these Mobius 120P are thus able to replace and outperform the 9 SickleFlow of our former XXL 25x25" model with same noise level! Plus the Mobius loop-dynamic bearing is rated at 210,000 hours or 22 years MTTF (mean-time-to-failure) vs 18 years MTTF for the SickleFlow.
Intertek tested our XL Ultra to achieve an unprecedented 24 Smoke CADR per Watt, more than double the energy efficiency of all large HEPA purifiers in the EnergyStar database!
XL Ultra is well-oriented: the main 5-fan bank can blows up and the 2-fan bank sideways, with one side against a wall. Finally, it really is luggable -- weighing only 8 lbs! Luggable XL Ultra comes with a side handle installed.
The optional hex mesh filter guard protects from prying little hands and claws. They also strengthen the box considerably. We recommend them if the box will be moved around a lot or placed in high traffic areas like classrooms or restaurants.
Variable speed control can be had with a 3-12V DC 3A power supply like this, sold separately.
Assembled SickleFlow Luggables carry FCC & UL507 Electrical Safety certifications plus meets California Air Resources Board (CARB) ozone limits. (They do not emit any ozone).
Luggable XL Ultra hardboard panels do not contain lead, Formaldehyde, or PFAS. However, like cooking, lasercutting 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
Luggable XL Ultra is the quietest, lightest, most compact and cost-effective way to protect 10 people to 40cfm/per level in medium-large rooms like classrooms and open kitchen/family rooms.
For the XL Ultra, Coolermaster provided us a special Black Edition of their industry-leading Mobius 120P 2400rpm fan. Seven of these Mobius 120P are thus able to replace and outperform the 9 SickleFlow of our former XXL 25x25" model with same noise level! Plus the Mobius loop-dynamic bearing is rated at 210,000 hours or 22 years MTTF (mean-time-to-failure) vs 18 years MTTF for the SickleFlow.
Intertek tested our XL Ultra to achieve an unprecedented 24 Smoke CADR per Watt, more than double the energy efficiency of all large HEPA purifiers in the EnergyStar database!
XL Ultra is well-oriented: the main 5-fan bank can blows up and the 2-fan bank sideways, with one side against a wall. Finally, it really is luggable -- weighing only 8 lbs! Luggable XL Ultra comes with a side handle installed.
The optional hex mesh filter guard protects from prying little hands and claws. They also strengthen the box considerably. We recommend them if the box will be moved around a lot or placed in high traffic areas like classrooms or restaurants.
Variable speed control can be had with a 3-12V DC 3A power supply like this, sold separately.
Assembled SickleFlow Luggables carry FCC & UL507 Electrical Safety certifications plus meets California Air Resources Board (CARB) ozone limits. (They do not emit any ozone).
Luggable XL Ultra hardboard panels do not contain lead, Formaldehyde, or PFAS. However, like cooking, lasercutting 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
Luggables are lightweight, thin, portable, CR Boxes covering rooms from small to large. This 16x25x7" 5-Mobius Ultra Luggable fits offices, living and dining rooms. It's well-oriented: the 5-fan bank can blow up or sideways, with one side against a wall. Finally, it really is luggable -- weighing only 6 lbs! Comes with a side suitcase handle installed.
For the Luggable Ultra, Coolermaster provided us a special Black Edition of their industry-leading Mobius 120P 2400rpm fan. Five of these Mobius 120P nearly reach 294 cfm Dust CADR, nearly the level of our previous 7-SickleFlow XL at similar noise level! Plus the Mobius loop-dynamic bearing is rated at 210,000 hours or 22 years MTTF (mean-time-to-failure) vs 18 years MTTF for the SickleFlow.
Intertek tested our Ultra to achieve an unprecedented 16 Smoke CADR per Watt, more than the energy efficiency of any HEPA purifiers in the EnergyStar database!
Hex mesh filter guards are available as accessory to protect from prying little hands and claws. We recommend them if the box will be moved around a lot or placed in high traffic areas like classrooms or restaurants.
Variable speed control can be had with a 3-12V DC 3A power supply like this, sold separately.
Assembled Luggables carry FCC & UL507 Electrical Safety certifications plus meets California Air Resources Board (CARB) ozone limits. (They do not emit any ozone).


Unassembled Kit has 20-30 minute assembly time with same procedure as used in the factory, but factory inspection is required to carry the UL507 sticker. Follow links for guides & videos.
Considering shipping prices, unassembled STEM Kit w/o filters can save ~$50 when 3M Filtrete MPR1900/MPR2200 16x25 are purchased separately from
- Sam's Club
- Lowes
- Outside the US, try Digi-Key
Luggable hardboard panels do not contain lead, Formaldehyde, or PFAS. However, like cooking, lasercutting 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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Variant5-fan SickleFlow
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Filters2 Filtrete 16x25" MPR1900+
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Dust/Virus CADR211 cfm
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Pollen CADR236 cfm
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Smoke CADR170 cfm
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Room Occupants (40cfm per)5
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5 ACH Coverage300 sq ft
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Power8 W
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Sound Pressure34.8 dB
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Dimensions16x25x7"
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Weight6 lbs
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VariantUltra - 5 MobiusP
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Filters2 Filtrete 16x25" MPR1900+
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Dust/Virus CADR294 cfm (500 m3/hr)
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Pollen CADR324 cfm
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Smoke CADR231 cfm
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Room Occupants (40cfm per)7.5
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5 ACH Coverage441 sq ft
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Power10.7 W
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Sound Pressure37.5 dBA
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Dimensions16x25x7"
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Weight6 lbs
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VariantXL Ultra - 7 MobiusP
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Filters2 Filtrete 20x25" MPR1900+
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Dust/Virus CADR401 cfm (681 m3/hr)
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Pollen CADR450 cfm
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Smoke CADR333 cfm
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Room Occupants (40cfm per)10
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5 ACH Coverage602 sq ft
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Power14 W
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Sound Pressure39 dBA
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Dimensions20x25x7"
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Weight8 lbs
- Integrated Suitcase Handle
- Stands tall or wide against a wall
- Lightweight: 6-10 lbs
- Internal pre-tensioner cords for easy slide-out filter changes and snug fit.
- UL-listed 120V AC to 12V 2A DC wall plug w/ 5.5x2.1mm barrel socket
- CoolerMaster fans are UL-registered components with 160,000 hours mean-time-to-failure for SickleFlow and 210,000 hours for Mobius!
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 FullClean Air Kits produce 5-10x less noise than HEPA purifiers at max capacity.
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One Speed DesignSpeed 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 EfficiencyDecades 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
