Filtrete 18x24x1, AC Furnace Air Filter, 6-Pack (exact dimensions 17.81 x 23.81 x 0.81) & Aerostar Clean House 12x12x1 MERV 8 Pleated Air Filter, Size 11 3/4''x11 3/4''x3/4'' 6 Pack,White

• Electrostatically charged fibers attracts and capture large airborne allergens like: Pollen, Household Dust, Lint Ideal for high-velocity heating and cooling systems Lasts up to 3 months Microparticle Performance Rating MPR 300 equates to Minimum Efficiency Reporting Value MERV 5 CHECK YOUR FIT - Nominal size: 12x12x1. Actual size: 11 3/4"x11 3/4"x3/4". This MERV 8 filter is comparable with MPR 600 & FPR 5. Designed to filter microscopic particles such as lint, dust mites, spores, and pollen IMPROVE INDOOR AIR QUALITY - Protect your family and loved ones with clean indoor air quality at home. Aerostar filters are a simple to install and cost-effective step towards a healthier home environment, free of airborne allergens and particles that can trigger various allergy and asthma symptoms. HIGH PERFORMING - 100% synthetic electrostatic media for high efficiency with low air flow resistance. For best results, change your filters every 60 to 90 days during normal times of year but increase frequency to 30 days during peak summer and winter months when your unit is working the hardest.