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Bard 7004-064 is an OEM throw-away pleated air filter rated MERV 13 in the common 20 x 30 x 2 nominal size, designed to fit Bard HVAC equipment that uses this filter footprint for return air filtration. Using the correct Bard filter helps protect indoor coils and blowers from dust loading, supports steady airflow, and maintains the filtration level your unit was designed to handle. If you are replacing a dirty or damaged filter, match the size and MERV rating to your unit manual to avoid airflow restrictions and keep service intervals predictable.