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How much CFM do I need for my furnace?

1300 cfm is equal to 10 times 130 cfm. This rule is used to determine furnace air flow. 150 cfm per 10, 000 Btu input is required for a condensation furnace. Induced and natural draft furnaces require 130 and 100 cfm per 10,000 Btu input, respectively.

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