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A Corsi-Rosenthal Box is a highly effective DIY air cleaner made of easy to obtain materials such as HVAC filters, a box fan, cardboard, and tape
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The airflow direction is labeled on the edge of the filter to ensure it is properly oriented when installed.
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The edge of this 1-inch HVAC filter indicates it's dimensions, allowing proper matching of filter to air handler
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The MERV rating, particle capture efficiencies, and pressure drops are printed on the side of this 1-inch pleated filter