Honeywell Post Filter for 20 x 20 F300E and F50F Electronic Air Cleaners.

The Honeywell High Efficiency Postfilter features patented filtration technology that improves filtration efficiency without reducing the air flow through your air cleaner, minimizing the strain put on your central air system.

Add a Honeywell High Efficiency Postfilter to your Honeywell Wholehouse Air Cleaner and capture even more of the particles making your home's environment uncomfortable. Allergens, pollen, mold spores, bacteria, dust and other microscopic particles are captured by the antimicrobial postfilter within the air cleaner before they reach the air you and your family breathe.

2 required for 20 x 20 air cleaner.