Honeywell 16x25 Electronic Air Cleaners Retrofit to 16x25 Media Air Cleaner. Part # FC100A1029. Package of 2This Filter Replaces the 2 Cells in the 16 x 25 Honeywell Electronic Air Cleaners Actual Size of Filter is 15 3 4" x 24 3 4" x 4 3 8" To Convert from Electronic Air Cleaner to Media Air Cleaner, you will need to turn Power Switch Off for the Electronic Air Cleaner permanently and remove the 2 Cells, we highly recommend disconnecting electrical power to Air Cleaner using a qualified Technician You may need to remove plastic tab at bottom of Air cleaner