KwiKool 18-FILTERBIO 4" HEPA Replacement Filter – For KBP1800 and KBX1800

The KwiKool 18-FILTERBIO is the OEM 4-inch HEPA replacement filter for the KBP1800 and KBX1800 BioAir 1800 CFM air scrubbers. It captures 99.999% of particles 0.12 microns and larger (ULPA-grade) and is sized specifically for the larger filter frame on the 1800 CFM models — not interchangeable with the 14-FILTERBIO used on the 600 and 1000 CFM units. Use with the 18-FILTERPRE pre-filter to extend service intervals. Compatible models: KBP1800, KBX1800 Filter depth: 4 inches Efficiency: 99.999% @ ≥0.12 microns (ULPA-grade) Not compatible with: KBP600, KBP1000, KBX600, KBX1000 (use 14-FILTERBIO for those) Pair with: 18-FILTERPRE pre-filter Specifications SKU 18-FILTERBIO Compatible Models KBP1800, KBX1800 Filter Depth 4 inches Efficiency 99.999% @ ≥0.12 microns (ULPA-grade) Not Compatible With KBP600, KBP1000, KBX600, KBX1000 Pre-Filter 18-FILTERPRE