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HVACQuick CRFB Corsi-Rosenthal Style Filter Box

A Corsi-Rosenthal (CR) box is a cost-effective, DIY air filter that significantly improves indoor air quality by effectively capturing airborne particles like dust, pollen, pet dander, mold, and respiratory droplets. It can help reduce allergy and asthma symptoms, potentially lower the risk of airborne infections, and is particularly useful in situations with poor ventilation, high pollution (like wildfire smoke), or as a supplemental air filtration solution. Compared to many commercially available HEPA air purifiers, a Corsi-Rosenthal box is significantly cheaper to build and operate.

If you live in an area with high levels of outdoor air pollution, or if your home has issues with dust, mold, or pet dander, a CR box can make a noticeable difference in your indoor environment. During wildfire season, these boxes can be invaluable in filtering out the fine particulate matter (PM2.5) that poses a significant health risk. 

Features:

• The Circulating Relief Filter Box is designed for efficient and affordable air filtration
• Five 1” MERV-13 filters are included
• Large filter area => low pressure drop and large dust holding capacity
• Elastic filter straps allow for zero-hassle filter replacement
• Accommodates 20” box fan (fan not included)
• Durable aluminum frame allows for simple and easy maintenance
• Some quick and easy assembly required

Note that the box fan is not included. The CRFB is shown with the Mainstays 20" 3-speed box fan (FB50-16HB) available from Walmart.