Factory original replacement filter size 20" x 25" x 4" (actual width is 4.5 inches) for Honeywell media air cleaner models F100F and F150E. Manufacturer recommends replacing filter twice a year.
20 x 25
Minimum Efficiency Reporting Value
Rating system created for air filters with a scale that represents the worst case performance of a filter when dealing with particles in the range of 0.3 to 10 micrometers. The scale is from 1-16. The higher the MERV rating the greater the percentage of particles that will be captured.
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