Honeywell FC100A1029-5pk 16\ x 25\ Media Air Filter, Merv 11 (Pack of 5)
- 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.
- and large particles, E3=3.0 to 10.0 microns.