Honeywell MERV 11 Media Air Cleaner - 20x25-4 inch

This is a very good investment that replaces your air filters that you must change every three months. This was recommended by our air conditioner man who knew we had to get up on a ladder to change those filters. This filter is installed in the attic on your air-conditioning unit. You only have to change the filter once a year.

My account is running so much better with this new filter system

The only filter I put in my installs

This review applies to ALL SIZES of the F100 and F200 Honeywell filtersI have masters degree in thermal and HVAC. We had HVAC company install this Honeywell media filter when our entire furnace and all ducting was replaced in our home.IMPORTANT: using a digital caliper, I measured air gaps ranging from 0.15" to 0.40" on TWO SIDES of recommended Honeywell brand filters installed in either F100 or F200.CONCLUSION: F100 and F200 "Whole-House Media Air Cleaners" are total garbage because they are leaking massive amounts of DIRTY unfiltered air around the Honeywell filters due to air gaps because of poor filter fit (poor design by Honeywell engineers).The tiresome workaround is to apply soft door weatherstripping in strips along full length of neighboring perimeter sides of every filter to fill the air gaps. You need to buy soft weatherstripping that can compress to fill gaps that range from 0.15" (5/32) to 0.40" (13/32) where the average gap is around 5/32 to about 3/16 inchOne alternative competitor system mentioned to me by home HVAC contractors is the IQAir PerfectPro series. I have no personal experience with home in-line furnace air filtration system except to warn all to be aware of the very high cost of the IQAir replacement filters. As an engineer I must note the obvious the IQAir PerfectPro is a much better design than the Honeywell F100/F200 series because the QAir PerfectPro has like FOUR TIMES the filtration surface area (so can do higher levels of filtration with lower air flow resistance)