Introducing our HEPA Composite Filter Set Replacement specially designed for the Whirlpool Air Purifier WA-3501FK and WA-3801SFK. Our factory takes pride in producing high-quality filter sets that meet or exceed industry standards. This filter set is composed of a pre-filter, a true HEPA filter, and an activated carbon filter. The pre-filter captures large particles, while the HEPA filter removes 99.97% of airborne particles as small as 0.3 microns. The activated carbon filter adsorbs odors and volatile organic compounds (VOCs) from the air. Our factory ensures that every filter set is rigorously tested before being shipped out to the customer. With this HEPA Composite Filter Set Replacement, you can enjoy fresh and healthy air in your home or office. Order now and breathe easy!