What is the normal supply air volume for forced air furnaces in cfm?

The normal supply air volume for forced air furnaces is generally calculated based on the heating load of the structure, and a common standard is around 400 to 500 cubic feet per minute (cfm) for every ton of cooling. However, in terms of heating and distribution efficiency, a higher volume can often be beneficial.

The choice of 700 cfm reflects a typical air volume requirement to ensure adequate distribution of heated air throughout a standard residential space. This volume helps to maintain comfortable temperatures efficiently while preventing hot spots and cold drafts.

Additionally, 700 cfm aligns well with industry practices for ensuring that the system operates smoothly and effectively, providing necessary airflow without excessive energy consumption or noise levels. This balance is crucial in forced air systems, where both heating performance and energy efficiency are top priorities, making it a well-accepted figure among HVAC professionals.