What is the main purpose of measuring pressure drop across a filter?

Measuring the pressure drop across a filter primarily serves to evaluate energy efficiency. When air flows through a filter, the pressure drop indicates the resistance encountered by the airflow. A higher pressure drop signifies that the filter is becoming clogged or that it is inefficient, leading to increased energy consumption by the fan or blower to maintain the necessary airflow. Monitoring this pressure drop allows facility managers and technicians to determine when a filter should be replaced, ensuring that the HVAC system operates efficiently. This assessment of energy usage aligns with operational costs and energy savings, making it a vital metric for maintaining optimal performance within air filtration systems.