A pleated filter provides additional surface area on which particles can be trapped. Filters with electrostatic charging can attract and capture particles that other filters can miss. Pressure Drop Pressure Drop - a measure of the filter's ability to allow the appropriate amount of air to flow through. For each type involved in the study, a minimum of three filter samples were tested to furnish the information. Pressure drop is measured in inches of water at 300 fpm.
Pressure drop is a measurement expressing the restriction of air flow through an air filter.
Pressure drop is measured by the difference in air pressure from one side of an air filter to the other. In an effort to improve the quality of household air, air filter manufacturers must achieve a balance between the density of the filtering media and the resistance of the air flowing through it. Frame Strength Frame Strength - the filter's ability to withstand pressure from airflow. It is important that a filter frame be able to withstand pressure created by air movement through the filter without bending or collapsing. If a frame bends, it can allow unfiltered air to bypass the filter.