Honeywell FC100A1011-20″ x 20″ x 4″ Pleated Air Filter, MERV 11 Bundle with S…
Model Info: FC100A1011. Item model number: FC100A1011. Part Number: FC100A1011. Material: Fiberglass, Magnet. Material Type: Fiberglass, Magnet. Nominal Filter Size: 20x20x4. Actual Filter Size: 19-15/16″ x 19-3/4″ x 4-3/8″.
Honeywell FC100A1011 20 x 20 x 4 replacement media air furnace 20″ x x 4″
Replace them every 6-12 months versus monthly or quarterly changes.