Box Fan Air Purifier
Convert any 20-inch box fan into an effective air purification system.
- Under $50 total cost
- 5-minute assembly
- Portable design
- High airflow
- Energy efficient
Get Started
Build your own high-performance air purifier with our Energy Star 2025 certified DIY kits. Save 60-70% vs commercial units with proven Corsi-Rosenthal Box design.