Honeywell FC100A1011 20 x 20 x 4.5 inch replacement media air furnace filter - MERV 11
- Minimum Efficiency Reporting Value (Media Filters Only): MERV 11.
- Efficiency Standard: Efficiency ranges are defined for small particles, E1=0.3 to 1.0 microns.
- and large particles, E3=3.0 to 10.0 microns..
- Fits Honeywell models: F25, F35, F100, F150.