Honeywell electronic air cleaners are efficient, effective and energy-saving industrial commercial air cleaners. Honeywell F57A1044 Flush Mounted Electronic Air Cleaner has Two Heavy Duty Commercial Cells and a washable prefilter; certified to be 94% efficient for rooms up to 1300 square feet. Honeywell F57B1026 Flush Mounted Electronic Air Cleaner with One Heavy Duty Commercial Cells and pre-filter certified to be 94% efficient for rooms up to 600 square feet. Honeywell F90A1001 Surface Mounted Electronic Air Cleaner with Two Heavy Duty Commercial Cells, 1285 CFM, and washable prefilter, certified 94% efficient for rooms up to 1600 square feet. Honeywell F90A1050 Surface Mounted Electronic Air Cleaner with Two Heavy Duty Commercial Cells, 1285 CFM, and washable prefilter 94% efficient at capturing 0.5 micron air borne particles in rooms up to 1600 square feet