THE HONEYWELL 50000293-004 POST Filter FOR 20X25 F300E AND F50F ELECTRONIC Air CLEANERS. MUST BE ORDERED IN MULTIPLES OF TEN (1O) (FIVE 2-PACKS OF 20X12.5).
The 50000293 Series high-efficiency, charged postfilters boost the efficiency of any Honeywell electronic air cleaner with negligible effect on pressure drop.