Honeywell Electronic Air Cleaner, 20x25 with performance enhancing post-filter

F300 optimizes efficiency with airflow capturing up to 98% of particles that pass through it. It operates with all gas, oil and electric forced warm air furnaces and AC systems, and is available in four sizes to fit most ducts. Very low pressure drop.|Media post-filter provides enhanced filtration on select models.|Solid state power supply is self-regulating and maintains peak efficiency during a wide range of cell dirt loading conditions.|Helps filter efficiency-robbing "gunk" before it coats critical system parts.|Rugged zinc-coated, roll-formed cabinet provides superior strength and corrosion protection.