The formula to calculate Air Horsepower (AHP) is:

\[ AHP = \frac{Q \cdot V \cdot H}{33,000} \]

Where:

• \(AHP\) is the air horsepower (hp).
• \(Q\) is the airflow rate (cfm).
• \(V\) is the specific weight of air (lb/ft³).
• \(H\) is the total head (ft).