CROWN VENT FILTERS - are unable to filter everything; but they do a great job at targeting particles 3-10 microns in size. THE DIFFERENCE – Crown Vent filters are different from the typical air filter. Static Electricity is used to attract particles to the filter media. The filter media undergoes a “charging” process during the manufacturing process, creating an electrostatic attractive quality. This provides a high-flowing efficient filter with minimal air flow reduction. EFFICIENT - Static Electricity is used to attract particles to the filter media. The filter media undergoes a “charging” process during the manufacturing process, creating an electrostatic attractive quality. This provides a high-flowing efficient filter with minimal air flow reduction. NO TOOLS REQUIRED – The filter media can be replaced in seconds without the use of any tools. Crown Vent Filter Media is designed to fit within the Crown Vent Magnetic Register Cover. Crown Vent Filter media is unable to filter everything; but it does a great job at targeting particles 3-10 microns in size.