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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660 sq ft 11 people
Brisk Box Ultra Air Purifier (8-fan Corsi-Rosenthal Box)
Brisk Box Ultra Air Purifier (8-fan Corsi-Rosenthal Box)
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Brisk Box Ultra Air Purifier (8-fan Corsi-Rosenthal Box)
Assembly & Support Videos
Brisk Box Ultra Black - Assembly
Step-by-step assembly guide for the Brisk Box Ultra Black.
Assembly • Brisk Box Ultra Black • 8:06
The Brisk Box Ultra Air Purifier (8-fan Corsi-Rosenthal Box) is designed to deliver exceptional, quiet, energy-efficient air cleaning for large rooms, classrooms, offices, workshops, and other shared indoor spaces.
Powered by eight premium UL-registered Cooler Master Mobius 120P Black Edition fans, the Brisk Box Ultra delivers outstanding airflow while maintaining low noise levels and excellent energy efficiency. Its durable, reusable design features a compact rectangular footprint that assembles in approximately 10 minutes without tape and breaks down into a flat pack for easy transport and storage.
High-Performance Filtration
Powered by eight Cooler Master Mobius Black Edition 2400 RPM fans and paired with compatible 3M Filtrete MERV 13 filters, the Brisk Box Ultra delivers outstanding clean air performance with industry-leading energy efficiency.
Performance includes:
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441 CFM Dust & Virus CADR
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404 CFM PM2.5 CADR
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450+ CFM Pollen CADR
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25.1 CFM per Watt energy efficiency
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48 dB operating noise
With more than twice the energy efficiency of many comparably sized HEPA room air purifiers, the Brisk Box Ultra provides powerful air cleaning while keeping energy costs low.
Filter Compatibility
The Brisk Box Ultra uses:
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Two 25 × 20 × 1" filters
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Two 25 × 14 × 1" filters
Compatible 3M Filtrete filters include:
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MPR 1900 (available at Lowe's)
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MPR 2500 (available at Costco)
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MPR 1600 (available at Sam's Club)
Equivalent 1" MERV 13 filters may also be used.
Filters are sold separately.
Assembly Options
Choose the option that works best for you:
UL-Certified Version – Includes the fan plate pre-assembled for quick final assembly.
STEM Kit – Assemble in approximately 10 minutes using the same no-tape process as our factory.
The durable corner extrusions with hook-and-loop fasteners make assembly quick, secure, and reusable.
Step-by-step video assembly guides and printable instructions are available to help make assembly simple.
Power Supply
Each Brisk Box Ultra includes a UL-listed 120V AC to 12V DC (2A) power supply with a 5.5 × 2.1 mm barrel connector.
Materials
Brisk Box Ultra panels are precision laser-cut from durable ¼-inch black melamine, providing a rigid, long-lasting structure with an attractive finished appearance.
Key Features
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Powerful 8-fan Corsi Rosenthal Box design
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Premium Cooler Master Mobius Black Edition fans
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Delivers up to 441 CFM Dust & Virus CADR
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Industry-leading energy efficiency
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UL-certified design available
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No-tape assembly in approximately 10 minutes
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Breaks down into a compact flat pack for storage and transport
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Durable black melamine construction
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Compact rectangular footprint
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Includes a UL-listed 12V power supply
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Assembled Size26x21x15"
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Fans8 CoolerMaster Mobius Black 2400rpm - UL registered
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3M Filtretetwo 25x20x1" + two 25x14x1" MPR1500-2500 (sold separately)
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Occupants @40cfm/person11
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5ACH Coverage660 sq ft
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Pollen CADR> 450 cfm
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Dust CADR441 cfm
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Smoke CADR370 cfm
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Power Usage16W
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PM2.5 Efficiency Factor25.2 cfm/Watt
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Sound Pressure48dB
- 120VAC to 12V 2A DC Barrel US wall adapter: UL-Registered
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
