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Do it Best MERV 8 efficency rated HVAC air filters are 15 times more effective than standard fiberglass filters. Protects against ragweed pollen, mold spores, dust mite debris, pet dander, and lint. Low airflow resistance saves on energy costs while still protecting furnace and air conditioning units. Lasts up to 90 days. NOTE: MERV: Minimum efficiency reporting value. The higher the MERV rating the better the filter.\
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