Actual size: 19 7/8 x 21 1/2 x 7/8 (19.875 x 21.5 x .875) inches | nominal size: 19 7/8 x 21 1/2 x 1 | pack of 8 filtration rating: merv 10. comparable to mpr rating 600 to 800, or fpr 5-6 rating. filters & blocks small particles such as lint, dust, pet dander, pollen, dust mites, smog, & mold. improved merv 10 filtration with similar air flow and resistance as a merv 8 filter. durable & long lasting: heavy duty frame won't buckle and pleats will not allow microbial growth. incorporates 100% synthetic fibers which are electrostatically charged, thermally bonded and are manufactured in an engineered gradient structure. the engineered grading structure media supports high dust-holding capacity and long filter service life. made in the usa. ideal for residential, commercial, schools, office, & industrial filtration applications. for optimal performance, recommended to change at least every 3 months.
