Honeywell FC100A1037 Specifications:

• Cartridge filter
• Filter life based on air quality
• Genuine Honeywell replacement filter
• Captures 96% of particles 3 to 10 microns in size
• Nominal Size: 20 inches x 20 inches x 4 3/8 inches 
• Actual Size: 19 7/8 inches x 19 7/8 inches x 4 3/8 inches

• Replacement media air cleaner with MERV of 11 (Minimum Efficiency Reporting Value)
• Efficiency ratings are based on American Society of Heating, Refrigerating and Air-Conditioning Engineers Standard 52.2 1999!
• Efficiency ranges are defined for small particles, E1=0.3 to 1.0 microns; medium particles, E2=1.0 to 3.0 microns; and large particles, E3=3.0 to 10.0 microns