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
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DIY Luftreiniger Deutschland: Unter €90 bauen, in 30 Min fertig. Kostenloser Versand. 99,95% HEPA H13 Filtration wie €599 Dyson. Stiftung Warentest Alternative 2025. Corsi-Rosenthal Box für Allergiker, Schulen & Büros.