A 10 kW heater installed in a 2 ton central air conditioning heating furnace should have an air flow of what range of CFM?

In the context of HVAC systems, the airflow requirement for a heating system can be determined based on the heating capacity of the unit and the temperature rise that is desired. A typical guideline for air handlers is that for every 1 kW of heating capacity, you should have about 0.5 CFM (cubic feet per minute) of airflow per 1,000 BTU/h of capacity.

With a 10 kW heater providing approximately 34,100 BTU/h (1 kW is roughly equivalent to 3,412 BTU/h), a corresponding airflow for the system can be calculated. The general rule of thumb suggests that for each 1,000 BTU/h, you should ideally have about 1 CFM.

Thus, for a heater with a capacity of about 34,100 BTU/h, you would want around 800-1,000 CFM of airflow. This matches well with the recommended range because it ensures efficient heat distribution throughout the space being heated. Considering that the heater is installed in a 2-ton (approximately 24,000 BTU/h) central air conditioning heating furnace, it operates effectively when the airflow is in the recommended range of 600 to 800 CFM, making