10 pack of pre-filters for the FA-430 Fume Extraction System. Use with the A1573 main HEPA filter. Note: Please note that the filters we use in our fume extraction systems are designed for removing particulate and byproducts from the soldering process ONLY. The filter media is not designed to be used as any type of respiratory mask or component, and the main filter of the FA-430 is not designed to filter viruses from the air.