Field Controls 1RK001 Replacement Filter Set for Trio-1000P Four stages of filtration, including HEPA, trap dust, dander, pollen and other airborne particles High intensity UVC germicidal lamp neutralizes and reduces airborne mold, bacteria and viruses PRO-Cell catalytic grid transforms odors and VOCs into fresh, breathable air Advanced electronics monitor and communicate system operation VOC sensor automatically increases the fan speed when harmful gases are present