Honeywell 50000293-002 - Post Filter, 16" x 12.5" For Electronic Air Cleaner 16" X 25" F300E, F50F (Single Use) Contains antimicrobial coating to protect against the growth of bacteria and fungus on the filter For the F300E F300A F50F F58F and will NOT fit the F50A or F50E Series. Lasts up to 6 months dimensions: 16x12.5 (Comes in 2-pack of filters measuring 16x12.5in each) Helps capture a high percentage of household air particles from air passing through the filter