The Atomic FC100A1011 20″x20″ Honeywell replacement media AC Filter is a high-efficiency Media Air Filter that can be used in Honeywell 20 x 20 Air Cleaners. The nominal size may be listed as 20x20x4 or 20x20x5 This is a genuine Atomic replacement for a Honeywell air conditioning filter.Honeywell FC100A1011 Specifications: Nominal Size: 20″ x 20″ x 4 3/8″ Actual Size: 19 7/8″ x 19 7/8″ x 4 3/8″ MERV 11 Rating Replaces FC35A1019 / 203721 Fits Honeywell Series: F25, F35, F100, and F150. Atomic FC100A1011 is the perfect replacement for your Honeywell High-Efficiency Media Air Cleaners. This air conditioner filter should be replaced at least once per year for maximum efficiency. Filter life based on air quality.
