Actual measurements: 19-1/2 x 19-1/2 x 3-3/4 inches | nominal size: 20x20x4 | quantity 3 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. note: does not replace 5" inch or 4-3/8" depth filters. please check actual filter size needed. made in the usa. ideal for residential, commercial, schools, & industrial filtration applications. for optimal performance, recommended to change at least every 3 months.
