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How many CFM is a 100 000 BTU furnace?

We have a 100,000 Btu input draft furnace. Divide the rated furnace input by 10,000 Btu to find required airflow. A factor of 10 is the number of 100,000 divided by 10,000. 1300 cfm is equal to 10 times 130 cfm.

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