Bonsai FFU 99.99% HEPA Replacement Filter – 3' x 2' (36"x24") Keep your Bonsai Fan Filter Unit running at peak performance with this high-efficiency 36" x 24" HEPA replacement filter, designed specifically for 3' x 2' FFU systems. Key Features:     True HEPA Filtration: Rated 99.99% efficiency at 0.3 microns, ideal for cleanroom-level filtration.     Long Service Life: Engineered for 3,000 hours or 3–5 years of normal use. Lifespan may vary based on environmental conditions.     Low Airflow Resistance: Maintains airflow with only 0.8 inches of resistance, ensuring smooth and efficient operation.     Hassle-Free Installation: Built for easy, no-fuss replacement into existing Bonsai FFU systems. Whether you're outfitting a mycology lab, cleanroom, or sterile workspace, this replacement filter ensures your air stays clean and your projects stay contaminant-free.