The static pressure calculation is an important step when designing air ducts. To operate correctly, ventilation systems much achieve an adequate airflow

Static pressure creates resistance against air movement in the ducts of an HVAC system, and air handling units must overcome this pressure to provide heating and cooling. The static pressure and airflow are the two main factors that determine how a fan operates, and also its power consumption. For these reasons, static pressure HVAC calculation is a very important step in the HVAC design process.

Air ducts are used in many types of HVAC systems, and their design has an impact on temperature control and energy efficiency. For example, packaged rooftop units (RTU) and fan coil units (FCU) are normally connected to an air duct system.  To specify these components correctly, and accurate static pressure calculation is necessary.

HVAC design is very important in building projects, since it has an impact on operation costs and maintenance expenses in the long run. HVAC also represents the highest energy expense for most residential and commercial buildings, and smart design decisions can reduce power and gas bills. To achieve higher performance, a ventilation system can be equipped with occupancy sensors, and variable-frequency drives (VFD) for fan speed control.

A well designed HVAC system also improves occupant comfort, boosting productivity in business settings. HVAC noise can be reduced by selecting optimal duct sizes, after an accurate static pressure calculation.