What is the formula to calculate CFM based on voltage and current?

The formula for calculating CFM (Cubic Feet per Minute) based on voltage and current involves understanding the relationship between electrical input, temperature rise, and airflow. When determining airflow in a heating or cooling system, we often utilize specific constants to convert electrical measures to airflow based on the temperature change.

In the correct formula, the term "voltage x current" represents the electrical power input to the system. The value 3.413 is a conversion factor that relates electrical power (in watts) to thermal output in BTUs. The division by "temperature rise x 1.08" helps to relate the thermal performance of the system to the airflow. The constant 1.08 comes from the specific heat of air and its density, allowing us to find the CFM required to achieve a certain temperature rise in a given system configuration.

Ultimately, the formula correctly aligns electrical power with the necessary airflow to produce an effective temperature change, integrating both electrical input and thermal output efficiently. This relationship is critical for the proper sizing and evaluation of HVAC systems, ensuring they perform as expected in real-world applications.