3-ton heat pump has approximately 1200 CFM of air flow. To calculate the filter grill size, divide the airflow, (CFM), by 2. 1200 / 2 = 600 square inches One filter grill or the total area of all grills must equal at least 600 square inches of area to adequately supply the system with the air needed to operate. ton of cooling = 12,000 BTU
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